JP7202924B2 - Method for diagnosing deterioration of paint film and probe for measurement - Google Patents

Description

The present disclosure relates to a method for diagnosing the state of deterioration of a coating film formed on the surface of a metal member, and a measuring probe used for diagnosing the state of deterioration of the coating film.

For example, a coating film formed on the surface of a metal member such as steel deteriorates over time under the influence of ultraviolet rays, moisture, and the like. When the coating film formed on the surface deteriorates, there is a possibility that the underlying metal member may corrode. Therefore, in order to properly protect metal members, it is necessary to quantitatively evaluate the deterioration state of the coating film from the results of electrochemical measurements such as AC impedance measurement, and diagnose the deterioration state of the coating film. It is performed periodically (for example, Patent Document 1).

Patent Document 1 discloses a cylinder, an electrolyte solution filled inside the cylinder, a counter electrode and a reference electrode immersed in the electrolyte solution, and a cylinder provided so as to protrude from the tip of the cylinder and containing the electrolyte solution. A measuring probe is disclosed that includes a sponge. Further, in Patent Document 1, an AC voltage is applied between the measurement probe and the metal member while the sponge at the tip of the measurement probe is in contact with the surface of the coating film, It is disclosed to measure AC impedance by passing a current between and.

In addition, as a measurement cell used for AC impedance measurement, a cylindrical body with an open end placed on the coating film, an electrolyte solution filled inside the cylindrical body, a counter electrode immersed in the electrolyte solution, and A reference electrode is known. The measurement cell applies an alternating voltage between the counter electrode and the metal member while the electrolyte solution is in contact with the coating film to be measured, so that a current flows between the counter electrode and the metal member. It's becoming

Japanese Patent No. 5902002

However, when the coating film is formed so as to face the gap provided in the structure, such as the gap formed between the flange surfaces of the flanged pipe joint, the above-described measuring probe Since it is difficult to bring the electrolyte solution of the measurement cell described above into contact with the coating film formed so as to face the gap, there is a possibility that the deterioration state of the coating film cannot be diagnosed.

In order to diagnose the deteriorated state of the coating film formed on the surface of the flange surface, it is necessary to release the flange fastening to widen the gap, which poses a problem that the diagnosis requires labor and time. Further, since it is difficult to widen the gap formed only by the metal member, there is a possibility that the deteriorated state of the coating film formed so as to face the gap cannot be diagnosed.

In view of the circumstances described above, an object of at least one embodiment of the present invention is to quickly diagnose the deterioration state of a coating film formed so as to face a gap provided in a structure. To provide a method for diagnosing a condition.

(1) A method for diagnosing the state of deterioration of a coating film according to at least one embodiment of the present invention includes:
A method for diagnosing the state of deterioration of a coating film formed on the surface of a metal member and formed to face a gap provided in a structure including the metal member,
filling the interstices of the structure with a first electrolyte solution;
electrically connecting a first electrode to the first electrolyte solution filled in the gap;
obtaining deterioration state information, which is information about the deterioration state of the coating film, using the first electrode;
and diagnosing the deterioration state of the coating film based on the deterioration state information.

According to the method (1) above, the method for diagnosing the state of deterioration of the coating comprises the steps of: filling a gap in a structure with a first electrolyte solution; and electrically connecting. By the above two steps, the first electrode is electrically connected to the coating film formed to face the gap through the first electrolyte solution filled in the gap of the structure. Electrochemical measurement using electrodes becomes possible. The potential of the metal member (working electrode) with respect to the first electrode is measured by a measuring device electrically connected to the portion of the metal member where the coating film is not formed and the first electrode via a conductive member such as a lead wire. etc. can be acquired as the deterioration state information described above, and the deterioration state of the coating film can be diagnosed from the acquired deterioration state information.

According to the above method (1), unlike the conventional method, the electrochemical measurement can be performed without bringing the measuring probe or the measuring cell into contact with the coating film or opening the gap of the structure. Become. Therefore, according to the above method, it is possible to quickly diagnose the deterioration state of the coating film formed so as to face the gap provided in the structure, as compared with the conventional method. In addition, while the conventional method diagnoses the state of deterioration of the coating film in the portion where the measuring probe or the measuring cell is in contact, according to the above method, the gap is filled with the first electrolyte solution. Since it is possible to diagnose the state of deterioration of the coating film in contact with the surface, it is possible to diagnose a wider range at once than the conventional method.

(2) In some embodiments, the method for diagnosing a state of deterioration of a coating film according to (1) above includes the steps of bringing a second electrode into contact with the first electrolyte solution filled in the gap; and applying an alternating voltage from two electrodes to the first electrolyte solution.

According to the method (2) above, the coating film formed to face the gap of the structure is electrically connected to the second electrode via the first electrolyte solution filled in the gap. By applying an alternating voltage from the second electrode to the first electrolyte solution, a current can flow between the second electrode and the metal member. By electrically connecting the second electrode to the second electrode via a conductive member such as a lead wire, the above-described measuring device measures AC impedance using the first electrode as a reference electrode, the second electrode as a counter electrode, and the metal member as a working electrode. , AC impedance and the like can be acquired as the deterioration state information described above. According to the method described above, it is possible to acquire more types of degradation state information than in the electrochemical measurement using the first electrode, so that the degradation state of the coating film can be diagnosed with higher accuracy.

(3) A measuring probe according to at least one embodiment of the present invention,
A measuring probe used for diagnosing a deterioration state of a coating film formed on a surface of a metal member, the coating film being formed so as to face a gap provided in a structure including the metal member. ,
a tubular member having an internal space;
a first electrode disposed within the interior space, the first electrode being configured to electrically connect to a first electrolyte solution that fills the interstices of the structure.

According to the above configuration (3), the first electrode of the measurement probe is electrically connected to the coating film formed to face the gap through the first electrolyte solution filled in the gap of the structure. Since it is adapted to be connected, an electrochemical measurement using the first electrode of the measuring probe is possible. The potential of the metal member (working electrode) with respect to the first electrode is measured by a measuring device electrically connected to the portion of the metal member where the coating film is not formed and the first electrode via a conductive member such as a lead wire. etc. can be acquired as the deterioration state information described above, and the deterioration state of the coating film can be diagnosed from the acquired deterioration state information.

(4) In some embodiments, in the measuring probe according to (3) above, the internal space is filled with a salt bridge, and the second electrolyte solution is stored above the salt bridge. and the first electrode is positioned in the interior space so as to be in contact with the second electrolyte solution.

According to the configuration (4) above, the first electrode supplies electricity to the first electrolyte solution filled in the gap through the second electrolyte solution stored in the internal space and the salt bridge filled in the internal space. connected The salt bridge can electrically connect the first electrolyte solution and the second electrolyte solution, and can suppress mixing of the first electrolyte solution and the second electrolyte solution.

(5) In some embodiments, the measurement probe according to (3) or (4) above includes an insulating tip-side closing member configured to close the tip-side opening of the tubular member. wherein the distal end side closing member is formed with a communication path configured to communicate the internal space and the outside of the measurement probe, and the communication path is configured to be filled with a salt bridge was done.

According to the above configuration (5), the distal end side closing member has a communication path configured to connect the internal space and the outside of the measurement probe, and the communication path is filled with a salt bridge. . The salt bridge filled in the connecting path is electrically connected to the first electrode arranged in the inner space of the tubular member. Further, when diagnosing the state of deterioration of the coating film using the measurement probe, the salt bridge filled in the communication path comes into contact with the first electrolyte solution near the external opening of the communication path. there is By providing the communication path in the distal end side closing member located on the distal end side of the measurement probe, the gap filled with the first electrolyte solution can be arranged closer to the gap than if the communication path were provided in the cylindrical member. Since it is easy to use, it is possible to improve the efficiency of the measurement work.

(6) In some embodiments, the measuring probe according to (4) or (5) above is insulated from the salt bridge filled in at least one of the internal space and the communication path, and It further comprises a second electrode attached to the measuring probe so as to be electrically connected to the first electrolyte solution filled in the gap.

According to the configuration (6) above, the second electrode of the measurement probe is electrically connected to the coating film formed to face the gap through the first electrolyte solution filled in the gap of the structure. Since they are connected, electrochemical measurement using the first electrode and the second electrode is possible. In addition, by applying an alternating voltage from the second electrode to the first electrolyte solution, a current can flow between the second electrode and the metal member. By electrically connecting the above-described measuring device to the second electrode via a conductive member such as a lead wire, AC impedance measurement is performed using the first electrode as a reference electrode, the second electrode as a counter electrode, and the metal member as a working electrode. , AC impedance, etc. can be obtained as the deterioration state information described above. According to the above configuration, it is possible to acquire more kinds of degradation state information than a measuring probe having only the first electrode, so that the degradation state of the coating film can be diagnosed with higher accuracy.

(7) In some embodiments, the measurement probe according to (6) above further comprises an insulating tip-side closing member configured to close the tip-side opening of the tubular member, The distal end side closing member has a communication path configured to communicate the internal space and the outside of the measurement probe, and the communication path is configured to be filled with a salt bridge. The second electrode is arranged in an outer peripheral groove provided in the outer peripheral surface of the side closing member along the circumferential direction.

According to the above configuration (7), by arranging the second electrode in the outer peripheral groove portion of the distal end side closing member located on the distal end side of the measurement probe, the second electrode is placed near the gap filled with the first electrolyte solution. Since it is easy to place them in the same place, it is possible to improve the efficiency of the measurement work.
Moreover, according to the configuration of (7) above, the salt bridge filled in the communication path and the second electrode can be arranged close to each other. Here, when diagnosing the state of deterioration of the coating film using the measurement probe, it is necessary to bring the salt bridge and the second electrode filled in the connecting path into contact with the first electrolyte solution. By arranging the salt bridge filled in the communication path and the second electrode close to each other, the work of bringing the salt bridge filled in the communication path and the second electrode into contact with the first electrolyte solution can be easily performed.

(8) In some embodiments, in the measuring probe according to any one of (3) to (7) above, a hydrophilic coating is applied to the distal end side outer peripheral edge of the tubular member.

According to the above configuration (8), by applying a hydrophilic coating to the outer periphery of the cylindrical member on the distal end side, the first electrolyte solution can be retained on the outer periphery of the cylindrical member on the distal end side. and the first electrolyte solution are electrically connected to each other stably.

According to at least one embodiment of the present invention, there is provided a method for diagnosing the deterioration state of a coating film, which can quickly diagnose the deterioration state of a coating film formed so as to face a gap provided in a structure. be.

1 is a flow diagram of a method for diagnosing a deterioration state of a coating film according to one embodiment of the present invention; FIG. 1 is a schematic configuration diagram schematically showing the overall configuration of a diagnostic system used in a method for diagnosing a deteriorated state of a coating film according to an embodiment of the present invention; FIG. 1 is a schematic diagram of a test piece used in a method for diagnosing a deterioration state of a coating film according to one embodiment of the present invention; FIG. FIG. 4 is a graph showing the results of a measurement test of the state of deterioration of a coating film using the test piece shown in FIG. 3. FIG. 1 is a schematic cross-sectional view along the axial direction of a measurement probe according to an embodiment of the present invention; FIG. 6 is a schematic partial enlarged cross-sectional view showing an enlarged tip side of the measurement probe shown in FIG. 5; FIG. 7 is a schematic front view of the distal closure member shown in FIG. 6; FIG. FIG. 8 is a schematic top view of the distal closure member shown in FIG. 7; FIG. 5 is a schematic cross-sectional view along the axial direction of a measurement probe according to another embodiment of the present invention; 10 is a schematic front view of the distal closure member shown in FIG. 9; FIG. 11 is a schematic top view of the distal closure member shown in FIG. 10; FIG. 11 is a schematic bottom view of the distal closure member shown in FIG. 10; FIG.

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. Absent.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "including", or "having" one component are not exclusive expressions excluding the presence of other components.
In addition, the same code|symbol may be attached|subjected about the same structure and description may be abbreviate|omitted.

FIG. 1 is a flow diagram of a method for diagnosing the state of deterioration of a coating film according to one embodiment of the present invention. FIG. 2 is a schematic configuration diagram schematically showing the overall configuration of a diagnostic system used in a method for diagnosing a deteriorated state of a coating film according to one embodiment of the present invention. The method 1 for diagnosing the state of deterioration of the paint film will be described below by taking as an example the case where the diagnosis system 2 shown in FIG. 2 is used.

A method 1 for diagnosing the state of deterioration of a coating film is a coating film 11 formed on the surface of a metal member 10 as shown in FIG. This is a method for diagnosing the state of deterioration of the coating film 11 formed so as to face.

A method 1 for diagnosing the state of deterioration of a coating film according to some embodiments comprises, as shown in FIG. A step S2 of electrically connecting the first electrode 31 to the first electrolyte solution E1, a step S5 of acquiring deterioration state information, which is information about the deterioration state of the coating film 11, using the first electrode 31, and the above and a step S6 of diagnosing the deterioration state of the coating film 11 based on the deterioration state information.

In the illustrated embodiment, a method 1 for diagnosing the state of deterioration of a coating film includes step S3 of bringing the second electrode 32 into contact with the first electrolyte solution E1 filled in the gap 13, and and a step S4 of applying an AC voltage to E1. In the embodiment shown in FIG. 1, the method 1 for diagnosing the state of deterioration of the paint film is performed in the order of steps S1, S2, S3, S4, S5, and S6.

In the illustrated embodiment, the structure 12 described above comprises the metal member 10 described above and a second metal member 14 different from the metal member 10, as shown in FIG. A coating film 15 is formed on the surface of the second metal member 14 . The second metal member 14 is arranged at a position such that the through hole 141 formed in the second metal member 14 communicates with the through hole 101 formed in the metal member 10 . The gap 13 described above is formed between the opposed surfaces 102 and 142 of the metal member 10 and the second metal member 14, as shown in FIG. In one embodiment, the gap 13 described above is formed between the fastening surfaces of joints made of metallic material that are flanged together.
Note that in some other embodiments, the gap 13 described above may be formed between the metal member 10 and a member made of a non-metallic material, or may be formed by the metal member 10 alone.

As shown in FIG. 2, the diagnostic system 2 includes a measuring probe 4, a measuring device 6, and a first lead wire 7A (first conductive member) electrically connecting the measuring probe 4 and the measuring device 6. ), the second lead wire 7B (second conductive member) electrically connecting the exposed portion 103 of the metal member 10 not provided with the coating film 11 and the measuring device 6, and the second lead wire 7B provided with and a working electrode 8 . The exposed portion 103 of the metal member 10 and the measuring device 6 are electrically connected via the second lead wire 7B and the working electrode 8 .
In the illustrated embodiment, the exposed portion 103 of the metal member 10 is provided on a surface different from the facing surface 102 described above.
Note that, in some other embodiments, the exposed portion 103 of the metal member 10 may be provided at a portion of the above-described facing surface 102 that does not face the facing surface 142 . Also, in some other embodiments, the metal member 10 to which the second lead wire 7B is connected may be used as the working electrode. In this case, the diagnostic system 2 may not be equipped with the working electrode 8 described above.

In step S1 described above, as shown in FIG. 2, the first electrolyte solution E1 may be poured toward the gap opening 121 of the structure 12 to fill the gap 13 with the first electrolyte solution E1. done. The first electrolyte solution E1 may overflow outside the gap 13 after filling the gap 13 .
In the illustrated embodiment, clearance opening 121 is defined by a boundary edge between the inner wall of through hole 101 and facing surface 102 and a boundary edge between the inner wall of through hole 141 and facing surface 142. there is The gap 13 causes a capillary phenomenon (surface tension) to act on the first electrolyte solution E1 introduced into the gap 13 through the gap opening 121, and the gap opening 121 side of the gap 13 to which the first electrolyte solution E1 is introduced. feeds the first electrolyte solution E1 to the remote side.
Note that, in some other embodiments, the gap opening 121 is a boundary edge between a surface continuous with the facing surface 102 other than the inner wall of the through hole 101 and the facing surface 102 and It may be defined by a boundary edge between a surface that is continuous with the facing surface 142 and the facing surface 142 . In other words, the electrochemical measurement may be performed without inserting the measurement probe 4 into the through holes 101 and 141 .

In the illustrated embodiment, step S1 described above is performed after the tip 40 of the measurement probe 4 is placed in the vicinity of the clearance opening 121 of the structure 12, as shown in FIG. The distal end portion 40 of the measuring probe 4 is located on the distal side (lower side in the figure) than the center in the length direction (vertical direction in FIG. 2) of the measuring probe. Therefore, the first electrolyte solution E1 is poured into the through-holes 101 and 141 while the tip portion 40 of the measurement probe 4 is inserted into the through-holes 101 and 141 . In this case, the first electrolyte solution E1 runs along the tip portion 40 of the measurement probe 4 and enters the gap 13, so before inserting the tip portion 40 of the measurement probe 4 into the through holes 101 and 141 , the first electrolyte solution E1 can be sent into the gap 13 more quickly than when the first electrolyte solution E1 is poured.
Note that in some other embodiments, step S<b>1 described above may be performed before inserting the distal end portion 40 of the measurement probe 4 into the through holes 101 and 141 .

The measurement probe 4 includes a cylindrical member 41 having an internal space 42 and a first electrode 31 arranged in the internal space 42, as shown in FIG. The cylindrical member 41 has insulating properties. The first electrode 31 is configured to be electrically connected to the first electrolyte solution E1 filled in the gap 13 of the structure 12 .
In the illustrated embodiment, the interior space 42 is filled with a salt bridge SB, as shown in FIG. In addition, the second electrolyte solution E2 is stored above the salt bridge SB in the internal space 42, that is, on the proximal end side (upper side in the drawing) of the salt bridge SB in the measuring probe 4. FIG. The first electrode 31 is arranged in the internal space 42 so as to be in contact with the second electrolyte solution E2, and through the second electrolyte solution E2 stored in the internal space 42 and the salt bridge SB filled in the internal space 42. , is configured to be electrically connected to the first electrolyte solution E1 filled in the gap 13 of the structure 12 .

In the illustrated embodiment, the distal end portion 40 of the measuring probe 4 is formed with a communication path 43 configured to communicate between the outside of the measuring probe 4 and the internal space 42, as shown in FIG. ing. The communication path 43 is filled with a salt bridge SB, and the salt bridge SB filled in the communication path 43 is electrically connected to the salt bridge SB, the second electrolyte solution E2, and the first electrode 31 filled in the internal space 42. It is connected to the. Further, the salt bridge SB filled in the communication path 43 is passed through the external opening 45 of the communication path 43 formed on the outer peripheral surface 44 of the tip portion 40 to the first electrolyte solution E1 existing outside the measuring probe 4. is electrically connected to the first electrolyte solution E1.

In step S2 described above, as shown in FIG. 2, the first electrode 31 is electrically connected to the first electrolyte solution E1 filled in the gap 13. As shown in FIG.
In the illustrated embodiment, as shown in FIG. 2, the tip 40 of the measuring probe 4 is immersed in the first electrolyte solution E1 overflowing from the gap 13, and the first electrolyte solution E1 and the communication path 43 are filled with the first electrolyte solution E1. The first electrode 31 is electrically connected to the first electrolytic solution E1 through the salt bridge SB by bringing the salt bridge SB into contact with the first electrode 31. As shown in FIG. In this case, if the tip portion 40 of the measurement probe 4 is immersed in the first electrolyte solution E1 existing in the gap 13, and the first electrolyte solution E1 and the salt bridge SB filled in the communication path 43 are brought into contact with each other, can be done easily compared to

In step S<b>5 described above, at least the first electrode 31 is used to acquire deterioration state information, which is information about the deterioration state of the coating film 11 .

In the illustrated embodiment, the measuring probe 4 further comprises a second electrode 32 attached to the tip 40, as shown in FIG. The second electrode 32 is insulated from the salt bridge SB that fills the internal space 42 . In addition, the second electrode 32 is exposed to the outside of the measurement probe 4, and is electrically connected to the first electrolyte solution E1 by coming into contact with the first electrolyte solution E1 existing outside the measurement probe 4. be done.

In the illustrated embodiment, the first lead wire 7A includes, as shown in FIG. A lead wire 7D joining the other end of the wire 7C and a lead wire 7E connecting the junction of the lead wires 7C and 7D to the measuring device 6 are included.

In this case, the second electrode 32 forms a closed circuit with the working electrode 8 (metal member 10) and is a counter electrode capable of passing a current between the working electrode 8 and the first The electrode 31 can be used as a reference electrode that serves as a reference for the potential when measuring the potentials of the second electrode 32 and the working electrode 8 . The measuring device 6 electrically connected to the measuring probe 4 described above can perform electrochemical measurements using three electrodes, the first electrode 31 , the second electrode 32 and the working electrode 8 . In the electrochemical measurement, the potential of the metal member 10 (working electrode 8) with respect to the first electrode 31, the AC impedance resistance value, the coating film resistance, the loss factor, etc. can be measured.

In the illustrated embodiment, the method 1 for diagnosing the deterioration state of the coating film is performed after the second electrode 32 is brought into contact with the first electrolyte solution E1 filled in the gap 13 (step S3 ), the measurement device 6 applies an alternating voltage from the second electrode 32 to the first electrolyte solution E1 (step S4), and the measurement device 6 obtains the first electrode as the deterioration state information in step S5 described above. It is possible to obtain the potential of the metal member 10 (working electrode 8) with respect to 31, the AC impedance resistance value, the coating film resistance, the loss factor, and the like.

In some other embodiments, the measuring probe 4 does not comprise the aforementioned second electrode 32 as shown in FIG. In this case, the structure of the measurement probe 4 can be simplified, and the size of the measurement probe 4 can be reduced. A measuring device 6 electrically connected to the measuring probe 4 can perform electrochemical measurements using two electrodes, the first electrode 31 and the working electrode 8 . In the electrochemical measurement, the AC impedance resistance value and the like cannot be obtained, but the potential of the metal member 10 (working electrode 8) with respect to the first electrode 31 can be measured.

In some other embodiments, the method 1 for diagnosing the state of deterioration of a coating film comprises steps S1, S2, S5 and S6 described above, but does not include steps S3 and S4 described above. In this case, the electric potential of the metal member 10 (working electrode 8) with respect to the first electrode 31 can be acquired as the deterioration state information in step S5 described above by the measuring device 6 described above.
Note that, in some embodiments, the measuring device 6 applies an AC voltage to the first electrode 31 before measuring the potential of the metal member 10 (working electrode 8) with respect to the first electrode 31, Alternating current may be passed between the electrode 31 and the metal member 10 .

In the illustrated embodiment, the measuring device 6 includes, as shown in FIG. (potential measurement, AC impedance measurement, etc.), a storage unit 63 configured to store deterioration state information of the coating film acquired by the measurement in the measurement unit 62, and a storage and a diagnosis unit 64 configured to diagnose the deterioration state of the coating film based on the deterioration state information stored in the unit 63 .
In step S4 described above, the application unit 61 applies an AC voltage from the second electrode 32 to the first electrolyte solution E1. In step S5 described above, the measurement unit 62 performs electrochemical measurement to acquire deterioration state information of the coating film. The deterioration state information of the coating film acquired in step S<b>5 described above is stored in the storage unit 63 .

FIG. 3 is a schematic diagram of a test piece used in the method for diagnosing the state of deterioration of a coating film according to one embodiment of the present invention.
As shown in FIG. 3, the test piece 9 (9A to 9E) is made of a flat plate-shaped metal material having a through hole 91 penetrating in the center along the thickness direction.
Each of the test pieces 9A to 9E has a coating film formed in advance on the entire outer surface except for the exposed portion to which the second lead wire 7B is connected.

The metal material of the test pieces 9B and 9C is subjected to corrosion treatment, and the metal material of the test piece 9C is subjected to a stronger corrosion treatment than the test piece 9B.
Each of the test pieces 9D and 9E has been subjected to the coating film peeling treatment described above. No coating film was formed on the area inside the circle 93 indicated by the two-dot chain line in FIG. 3 on the facing surface 92 of the test piece 9D. In addition, a coating film is not formed in a region inside a circle 94 indicated by a two-dot chain line in FIG. .
The test piece 9A is a sound test piece that has not been subjected to the above-described corrosion treatment and coating film peeling treatment.

FIG. 4 is a graph showing the results of a measurement test of the state of deterioration of the coating film using the test piece shown in FIG. In the measurement test, the diagnosis system 2 as shown in FIG. 2 was used, the test pieces 9A to 9E were each made of the metal member 10, and the measurement probe 4 including the first electrode 31 and the second electrode 32 was used. In the measurement test, steps S1 to S5 described above were performed in order, and the potential of the test piece 9 (9A to 9E) with respect to the first electrode 31 and the AC impedance resistance value were measured. The AC impedance resistance value was obtained by applying an AC voltage to the second electrode 32 by the measuring device 6 and causing a current to flow between the second electrode 32 and the test piece 9 .

As shown in FIG. 4, each of the corrosion-treated test pieces 9B and 9C has a lower insulation resistance of the metal material than the sound test piece 9A, so the potential is lower than that of the sound test piece 9A. and the AC impedance resistance value tended to decrease. Also, the test piece 9C, which was subjected to a stronger corrosion treatment than the test piece 9B, tended to have a lower potential and AC impedance resistance value than the test piece 9B. It is known that corrosion of the metal material on which the coating film is formed progresses when deterioration of the coating film progresses to some extent.
As shown in FIG. 4, each of the test pieces 9D and 9E subjected to the coating film peeling treatment has a lower coating film resistance than the healthy test piece 9A and the deteriorated test pieces 9B and 9C. Therefore, the potential and the AC impedance resistance tended to be lower than those of the sound test piece 9A and the test pieces 9B and 9C subjected to deterioration treatment. Also, the test piece 9E, which was peeled over a wider area than the test piece 9D, tended to have a lower AC impedance resistance value than the test piece 9D, but had the same potential. In other words, it is not possible to grasp the size of the peeled area of the coating film by measuring only the potential.

In step S6 described above, based on the deterioration state information (the potential of the metal member 10 (working electrode 8) with respect to the first electrode 31, the AC impedance resistance value, etc.) acquired in step S5 described above, the deterioration state of the coating film 11 Diagnose.
In the illustrated embodiment, diagnostic information, which is information related to diagnosis such as information in a healthy state corresponding to the deterioration state information, pre-accumulated deterioration state information, or a threshold value determined from the pre-accumulated deterioration state information, is included. It is stored in the storage unit 63 . The diagnosis unit 64 diagnoses the deterioration state of the coating film 11 by comparing the acquired deterioration state information with the diagnosis information stored in the storage unit 63 .
In some other embodiments, the diagnostic unit 64 described above may be provided by a diagnostic device different from the measurement device 6, and the diagnosis in step S6 may be performed by the diagnostic device, or the diagnosis in step S6 may be performed by the device. Instead, it may be done by a person.

In some embodiments described above, the application unit 61 of the measurement device 6 described above is configured to apply an AC voltage to the first electrode 31 and the second electrode 32. In the embodiment, the application section 61 of the measuring device 6 described above may be configured to apply a DC voltage to the first electrode 31 and the second electrode 32 .

As described above, the method 1 for diagnosing the state of deterioration of a coating film according to some embodiments includes, as shown in FIG. and the above-described step S2 of electrically connecting the first electrode 31 to the first electrolyte solution E1 filled in the gap 13, and the deterioration state, which is information regarding the deterioration state of the coating film 11, using the first electrode 31. The above-described step S5 of acquiring information and the above-described step S6 of diagnosing the deterioration state of the coating film 11 based on the deterioration state information are provided.

According to the above method, the method 1 for diagnosing the state of deterioration of the coating consists of the above-described step S1 of filling the gap 13 of the structure 12 with the first electrolyte solution E1, and the first electrolyte solution E1 filling the gap 13 and the above-described step S2 of electrically connecting the first electrode 31 to . Through the two steps (S1 and S2) described above, the first electrode 31 forms the coating film 11 so as to face the gap 13 via the first electrolyte solution E1 filled in the gap 13 of the structure 12. , electrochemical measurement using the first electrode 31 is possible. Electricity is applied to each of the portion (exposed portion 103) of the metal member 10 where the coating film 11 is not formed and the first electrode 31 via a conductive member such as a lead wire (first lead wire 7A, second lead wire 7B). The potential of the metal member 10 (working electrode) with respect to the first electrode 31 and the like can be obtained as the deterioration state information described above by the measuring device 6 that is connected to the first electrode 31, and the deterioration state of the coating film can be determined from the obtained deterioration state information. can be diagnosed.

Further, according to the above method, unlike the conventional method, the electrochemical measurement can be performed without bringing the measuring probe or the measuring cell into contact with the coating film 11 or opening the gap 13 of the structure 12. It becomes possible. Therefore, according to the above method, it is possible to quickly diagnose the deterioration state of the coating film 11 formed so as to face the gap 13 provided in the structure 12, as compared with the conventional method. Further, while the conventional method diagnoses the state of deterioration of the coating film 11 at the portion in contact with the measuring probe or the measuring cell, according to the above method, the first Since the state of deterioration of the coating film 11 in contact with the electrolyte solution E1 can be diagnosed, a wider range can be diagnosed at once than the conventional method.

As described above, the method 1 for diagnosing the state of deterioration of a coating film according to some embodiments includes steps S1, S2, S5, and S6 described above and filling the gap 13, as shown in FIG. Step S3 of bringing the second electrode 32 into contact with the first electrolyte solution E1, and Step S4 of applying an AC voltage from the second electrode 32 to the first electrolyte solution E1.

According to the above method, the coating film 11 formed to face the gap 13 of the structure 12 is electrically connected to the second electrode 32 via the first electrolyte solution E1 filled in the gap 13. be done. By applying an alternating voltage from the second electrode 32 to the first electrolyte solution E1, a current can flow between the second electrode 32 and the metal member 10. As shown in FIG. By electrically connecting the second electrode to the second electrode through a conductive member such as a lead wire, the measuring device 6 described above uses the first electrode as the reference electrode, the second electrode as the counter electrode, and the metal member as the working electrode to measure the AC impedance. By the measurement, AC impedance and the like can be obtained as the deterioration state information described above. According to the above method, a wider variety of deterioration state information can be obtained than in the electrochemical measurement using the first electrode 31, so that the deterioration state of the coating film can be diagnosed with higher accuracy.

FIG. 5 is a schematic cross-sectional view along the axial direction of the measuring probe according to one embodiment of the present invention. FIG. 6 is a schematic partial enlarged cross-sectional view showing an enlarged tip side of the measurement probe shown in FIG. 7 is a schematic front view of the distal closure member shown in FIG. 6; FIG. 8 is a schematic top view of the distal closure member shown in FIG. 7; FIG. FIG. 9 is a schematic cross-sectional view along the axial direction of a measuring probe according to another embodiment of the present invention. 10 is a schematic front view of the distal closure member shown in FIG. 9; FIG. 11 is a schematic top view of the distal closure member shown in FIG. 10; FIG. 12 is a schematic bottom view of the distal closure member shown in FIG. 10; FIG.

As described above, the measuring probes 4 (4A, 4B) according to some embodiments include a tubular member 41 having an internal space 42 and a a first electrode 31 disposed, the first electrode 31 configured to electrically connect to the first electrolyte solution E1 filled in the interstices 13 of the structure 12;

According to the above configuration, the coating film 11 formed so that the first electrode 31 of the measurement probe 4 faces the gap 13 through the first electrolyte solution E1 filled in the gap 13 of the structure 12. , electrochemical measurement using the first electrode 31 of the measuring probe 4 becomes possible. Electricity is applied to each of the exposed portion 103 and the first electrode 31, which are portions of the metal member 10 where the coating film 11 is not formed, via conductive members such as lead wires (first lead wire 7A, second lead wire 7B). The potential of the metal member 10 with respect to the first electrode 31 and the like can be acquired as the deterioration state information described above by the measuring device 6 that is physically connected, and the deterioration state of the coating film 11 can be diagnosed from the acquired deterioration state information. can be done.

In some embodiments, as shown in FIGS. 2, 5 and 9, the interior space 42 described above is filled with the salt bridge SB described above, and the second electrolyte solution E2 is above the salt bridge SB. The first electrode 31, which is stored and described above, is arranged in the internal space 42 so as to be in contact with the second electrolyte solution E2. According to the above configuration, the first electrode 31 is connected to the second electrolyte solution E2 stored in the internal space 42 and the first electrolyte filling the gap 13 via the salt bridge SB filled in the internal space 42. It is electrically connected to solution E1. The salt bridge SB can electrically connect the first electrolyte solution E1 and the second electrolyte solution E2, and can suppress mixing of the first electrolyte solution E1 and the second electrolyte solution E2.

In some embodiments, the first electrode 31 mentioned above is a silver/silver chloride electrode (Ag/AgCl electrode) and the second electrode 32 mentioned above is a platinum electrode.
Moreover, in some embodiments, the first electrolyte solution E1 described above is a solution different in type from the second electrolyte solution E2 described above. In the illustrated embodiment, the second electrolyte solution E2 is a saturated KCl solution (potassium chloride solution), the salt bridge SB is made of a KCl solution solidified with agar or the like, and the first electrolyte solution E1 is a sodium sulfate solution. is. In this case, since the gap 13 is not filled with the saturated KCl solution (second electrolyte solution E2), it is possible to prevent the saturated KCl solution from entering the gap 13 and adversely affecting the metal member 10 and the coating film 11. .
It should be noted that in some other embodiments, the second electrolyte solution E2 is a sodium sulfate solution, such as sodium phosphate, sodium hydrogen phosphate, pentasodium triphosphate, sodium carbonate, sodium pentaborate, silica It may be an aqueous solution of phosphate, carbonate, borate or silicate such as sodium phosphate, or one obtained by adding a rust preventive to these aqueous solutions. Also, the salt bridge SB may be obtained by hardening these aqueous solutions with agar or the like.

As shown in FIGS. 5 and 9, the measuring probes 4 (4A, 4B) include the above-described tubular member 41 that extends along the length direction (vertical direction in the drawings) and has insulating properties, and the above-described The first electrode 31, the above-described second electrode 32, the above-described communication path 43, and the distal end side (lower side in the figure) of the cylindrical member 41, which is configured to close the opening. A closing member 46 (51, 55) and an insulating proximal side closing member 47 (52, 56) configured to close the proximal side (upper side in the drawing) opening of the tubular member 41. Prepare. In the embodiment shown in FIGS. 5 and 9, the communication passage 43 described above is provided in the distal end closure member 46 and the external opening 45 is formed in the outer peripheral surface of the distal end closure member 46 .

In the embodiment shown in FIG. 5, the external opening 45 is provided on the proximal side of the second electrode 32A in the longitudinal direction of the measuring probe 4A.

As shown in FIG. 5, the tubular member 41 of the measurement probe 4A is made of an insulating glass material, and is positioned on the distal side tubular portion 41A and on the proximal side of the distal tubular portion 41A. , and a proximal side tubular portion 41B formed to have a larger diameter than the distal side tubular portion 41A, and a proximal side end portion of the distal side tubular portion 41A in the length direction and the proximal side tubular portion 41B. Each of the inner diameter and the outer diameter gradually decreases from the distal end of the proximal tubular portion 41B toward the proximal end of the distal tubular portion 41A so as to connect with the distal end. and a tapered tubular portion 41C that decreases to . In this case, by arranging the first electrode 31 in the base end side tubular portion 41B, the first electrode 31 can have a large electrode area.

The tip-side closing member 51 (tip-side closing member 46) of the measuring probe 4A is made of an insulating resin material, and penetrates along the length direction of the measuring probe 4A as shown in FIGS. It is formed in a disk shape having a through hole 511 in the center. As shown in FIG. 7, the distal end-side closing member 51 is recessed from the proximal end-side flat surface 512 and extends in all directions along the direction perpendicular to (intersecting) the length direction of the measurement probe 4A. It has four grooves 513 present. The distal side closing member 51 closes the distal side opening 413 of the tubular member 41 by having the proximal side flat surface 512 abut against the distal surface 412 of the tubular member 41 as shown in FIG. The four grooves 513 serve as the communication paths 43 described above, and the outer peripheral opening edges of the four grooves 513 serve as the external openings 45 described above.

The second electrode 32 (32A) of the measuring probe 4A is, as shown in FIG. 6, shaped like a disk having a female threaded hole 321 extending along the length of the measuring probe 4A.

As shown in FIG. 6, the measurement probe 4A includes a tip side insulating member 48 located on the tip side of the second electrode 32A, and a tip side closing member that connects the second electrode 32A in the length direction of the measurement probe 4A. 51 and a support rod member 49 sandwiched between the tip side insulating member 48 .
The distal end side insulating member 48 is made of an insulating resin material, and as shown in FIG. female screw hole 481.

The support rod member 49 is made of a steel material (metal material) having conductivity, and as shown in FIG. 6, is formed in a rod shape extending along the length direction of the measurement probe 4A. As shown in FIG. 6, the support rod member 49 has a distal end portion 491 with a male screw formed on its outer periphery, and the second electrode 32A and the distal insulating member 48 are screwed into the distal end portion 491. Thus, the second electrode 32A is sandwiched between the distal end side closing member 51 and the distal end side insulating member 48. As shown in FIG. In addition, the support rod member 49 is electrically connected to the second electrode 32A via the tip portion 491. As shown in FIG.
As shown in FIG. 6, between the distal end blocking member 51 and the second electrode 32A and between the second electrode 32A and the distal insulating member 48 in the length direction of the measuring probe 4A, a central through hole is provided. A disc-shaped gasket 50 having a hole 501 may be sandwiched.

In addition, as shown in FIG. 6, the support rod member 49 has a through hole 511 and a groove portion 513 of the distal end side closing member 51, and an outer peripheral surface of an insertion portion 492 which is a portion inserted through the internal space 42. It is covered with a covering member 54 made of a resin material having properties. The insertion portion 492 is positioned closer to the proximal side than the distal end portion 491 . Therefore, the support rod member 49 is arranged in the tip end side closing member 51 and the salt bridge SB filled in the internal space 42, the second electrolyte solution E2 stored in the internal space 42, and the internal space 42 by the covering member 54. It is insulated with respect to the first electrode 31 which is connected.

The proximal side closing member 52 (the proximal side closing member 47) of the measurement probe 4A is made of an insulating resin material, and as shown in FIG. In addition, by fitting the proximal end portion of the proximal side tubular portion 41B, the proximal side opening 414 of the tubular member 41 is closed. Further, as shown in FIG. 5, the distal side closing member 51 includes a through hole 523 for inserting the first electrode 31 from the proximal side, an insertion hole 524 for inserting the support rod member 49, a and an introduction hole 525 for introducing the electrolyte solution E2 into the internal space .

As shown in FIG. 5, the lead wire 7C is connected to a portion of the first electrode 31 that protrudes further to the proximal side than the proximal closing member 52. As shown in FIG.
As shown in FIG. 5, the support rod member 49 is fixed to the proximal side blocking member 52 to suspend the distal side blocking member 51, the second electrode 32A and the distal side insulating member 48 from the proximal side. Support. A lead wire 7</b>D is connected to a portion of the support rod member 49 that protrudes further toward the base end side than the distal end side closing member 51 .

In the embodiment shown in FIG. 9, the external opening 45 is provided on the distal side of the second electrode 32B in the length direction of the measurement probe 4B.

The cylindrical member 41 of the measuring probe 4B is made of a fluororesin material (resin material) having flexibility and shape restoring properties to the extent that it can be deformed, for example, by bending. It includes a tubular portion 41D extending along the length direction of the probe 4B. In this case, since the tubular member 41 of the measurement probe 4B is deformable, the work of arranging the distal end portion 40 of the measurement probe 4B in the vicinity of the clearance opening 121 of the structure 12 can be easily and quickly performed. It can be carried out.

The tip-side closing member 55 (tip-side closing member 46) of the measurement probe 4B is made of an insulating resin material, and as shown in FIGS. an insertion portion 552 which is formed to have a diameter smaller than that of the closing portion 551 and is configured to be inserted from the distal end side opening 413 of the cylindrical member 41; and an electrode mounting portion 554 having a smaller diameter than the closing portion 551 and the tip portion 553 in the longitudinal direction of the measuring probe 4B. The closing portion 551, the insertion portion 552, the electrode mounting portion 554 and the distal end portion 553 are integrally formed.
9, the insertion portion 552 is inserted from the distal end side of the tubular member 41, and the distal end surface 416 of the tubular member 41 is brought into contact with the proximal surface of the closing portion 551. As shown in FIG. By bringing them into contact with each other, the opening 413 on the distal end side of the cylindrical member 41 is closed.

The proximal side closing member 56 (the proximal side closing member 47) of the measurement probe 4B is made of an insulating resin material, and as shown in FIG. and an insertion portion 562 which is formed to have a diameter smaller than that of the closing portion 561 and is configured to be inserted from the base end side opening 414 of the cylindrical member 41 . The closing portion 561 and the insertion portion 562 are configured integrally. Further, as shown in FIG. 9, the base-end closing member 56 has an insertion hole 563 for inserting a small-diameter portion formed to be smaller in diameter than the portion of the first electrode 31 disposed in the internal space 42. .
As shown in FIG. 9, the proximal side closing member 56 is configured such that the insertion portion 562 is inserted from the proximal side of the tubular member 41, and the proximal surface 417 of the tubular member 41 is aligned with the distal side surface of the closing portion 561. The proximal opening 414 of the cylindrical member 41 is closed by bringing it into contact with the member.

As shown in FIG. 9, the distal end side closing member 55 has an outer peripheral groove portion 554A along the circumferential direction between the outer peripheral surface of the closing portion 551 and the outer peripheral surface of the distal end portion 553 in the length direction of the measuring probe 4B. have.

As shown in FIG. 9, the measuring probe 4B includes a distal end portion 571 that is spirally wound around the outer circumferential groove portion 554A (the outer peripheral surface of the electrode mounting portion 554), and a base portion extending from the distal end of the distal end portion 571. It comprises a metal wire 57 having an extension 572 extending towards its end.
In the illustrated embodiment, the metal wire 57 is made of platinum, and the tip portion 571 serves as the second electrode 32 (32B) described above.

The metal wire 57 has such flexibility that it can be deformed such as by bending. The extending portion 572 of the metal wire 57 can change its shape according to the shape change of the cylindrical member 41 of the measurement probe 4B. With such a measuring probe 4B, the operation of arranging the distal end portion 40 in the vicinity of the clearance opening 121 of the structure 12 can be performed easily and quickly.

As shown in FIGS. 9-11, the distal end closure member 55 is provided with a groove 555 through which the extension 572 of the metal wire 57 is inserted. The groove portion 555 is recessed radially inward from the outer peripheral surface of the closing portion 551 and the outer peripheral surface of the insertion portion 552 and extends along the length direction of the measurement probe 4B.

As shown in FIG. 9, the proximal closing member 56 is provided with a groove 564 through which the extending portion 572 of the metal wire 57 is inserted. The groove portion 564 is recessed radially inward from the outer peripheral surface of the closing portion 561 and the outer peripheral surface of the insertion portion 562 and extends along the length direction of the measuring probe 4B.

As shown in FIG. 9, the extending portion 572 of the metal wire 57 is covered with the covering member 58 made of an insulating resin material on the outer peripheral surface of the portion inserted through the groove 555, the internal space 42 and the groove 564. covered. Therefore, the metal wire 57 is applied to the salt bridge SB filled in the internal space 42, the second electrolyte solution E2 stored in the internal space 42, and the first electrode 31 arranged in the internal space 42 by the covering member 58. insulated against.

As shown in FIG. 9, the lead wire 7C is connected to the portion of the first electrode 31 that protrudes further to the proximal side than the proximal-side closing member 56. As shown in FIG.
The extending portion 572 of the metal wire 57, as shown in FIG. Line 7D is connected. The second electrode 32B (tip portion 571 of the metal wire 57) is electrically connected to the lead wire 7D via the extension portion 572 of the metal wire 57. As shown in FIG.

As shown in FIGS. 10 and 12, the distal end-side closing member 55 passes through the insertion portion 552 and the closing portion 551 from the proximal side, extends to the middle of the distal end portion 553, and extends in the length direction of the measuring probe 4B. and four holes 557 extending in four directions from the hole 556 along a direction perpendicular to (intersecting) the length direction of the measurement probe 4B. The hole portion 556 and the four hole portions 557 serve as the communication path 43 described above, and the external openings 558 of the four hole portions 557 formed on the outer peripheral surface of the distal end portion 553 serve as the external openings 45 described above.

In some embodiments, the measurement probe 4 (4A, 4B) includes the tubular member 41 described above, the first electrode 31 described above, and the tip of the tubular member 41, as shown in FIGS. An insulating distal side closing member 46 (51, 55) configured to close the distal side opening 413 of the tubular member 41 configured to close the side opening 413 is provided. The distal end side closing member 46 (51, 55) is formed with a communication path 43 configured to communicate between the internal space 42 and the outside of the measurement probe 4 (4A, 4B). It was configured to be filled with SB.

According to the above configuration, the distal end side closing member 46 (51, 55) is formed with the communication path 43 configured to communicate the internal space 42 and the outside of the measurement probe 4 (4A, 4B), The connecting path 43 is filled with a salt bridge SB. The salt bridge SB filled in the connecting path 43 is electrically connected to the first electrode 31 arranged in the internal space 42 of the tubular member 41 . Further, when diagnosing the deterioration state of the coating film 11 using the measurement probes 4 (4A, 4B), the salt bridge SB filled in the communication path 43 is located near the external opening 45 of the communication path 43, It is adapted to come into contact with the first electrolyte solution E1. By providing the communication path 43 in the distal end side closing member 46 (51, 55) located on the distal end side of the measurement probe 4 (4A, 4B), compared to the case where the communication path 43 is formed in the cylindrical member 41, Therefore, it is easy to arrange the sensor near the gap filled with the first electrolyte solution E1, so that the efficiency of the measurement work can be improved.

In some other embodiments, the connecting path 43 may be formed in the tubular member 41 and the external opening 45 may be provided in the distal end side outer peripheral edge 411 of the tubular member 41 .

In some embodiments, the measuring probes 4 (4A, 4B) are, as shown in FIGS. 43 is insulated from the salt bridge SB filled in at least one of the gaps 13, and attached to the measuring probes 4 (4A, 4B) so as to be electrically connected to the first electrolyte solution E1 filled in the gap 13. and a second electrode 32 .

According to the above configuration, the second electrode 32 of the measurement probe 4 (4A, 4B) is formed to face the gap 13 via the first electrolyte solution E1 filled in the gap 13 of the structure 12. Electrochemical measurement using the first electrode 31 and the second electrode 32 is possible because the electrode is electrically connected to the applied coating film 11 . In addition, by applying an alternating voltage from the second electrode 32 to the first electrolyte solution E1, a current can flow between the second electrode 32 and the metal member 10 (working electrode 8). By electrically connecting the measuring device 6 to the second electrode 32 via a conductive member such as a lead wire (first lead wire 7A, second lead wire 7B), the first electrode 31 is used as a reference electrode and the second By AC impedance measurement using the electrode 32 as the counter electrode and the metal member 10 as the working electrode, the AC impedance and the like can be obtained as the deterioration state information described above. According to the above configuration, it is possible to acquire more types of deterioration state information than the measuring probe 4 having only the first electrode 31, so that the deterioration state of the coating film 11 can be diagnosed more accurately. can.

In some embodiments, the measuring probes 4 (4A, 4B) described above, as shown in FIG. and a distal end side closing member 55 having insulation configured to close the distal end side opening 413 of the tubular member 41 . The distal end side closing member 55 is formed with a communication path 43 configured to communicate between the internal space 42 and the outside of the measurement probes 4 (4A, 4B), and the communication path 43 is filled with the salt bridge SB. , and the second electrode 32 is arranged in an outer circumferential groove 554A provided in the outer circumferential surface of the distal end side closing member 55 along the circumferential direction.

According to the above configuration, by arranging the second electrode 32 in the outer peripheral groove portion 554A of the distal end side closing member 55 located on the distal end side of the measurement probe 4 (4A, 4B), the second electrode 32 is connected to the first electrolyte. Since it can be easily arranged near the gap 13 filled with the solution E1, it is possible to improve the efficiency of the measurement work.
Further, according to the above configuration, the salt bridge SB filled in the connecting path 43 and the second electrode 32 can be arranged close to each other. Here, when diagnosing the state of deterioration of the coating film 11 using the measurement probes 4 (4A, 4B), the salt bridge SB and the second electrode 32 filled in the communication path 43 are brought into contact with the first electrolyte solution E1. need to let By arranging the salt bridge SB filled in the communication path 43 and the second electrode 32 close to each other, the work of bringing the salt bridge SB filled in the communication path 43 and the second electrode 32 into contact with the first electrolyte solution E1 can be performed. can be easily done.

In some embodiments, as shown in FIG. 5, a hydrophilic coating 53 was applied to the distal outer peripheral edge 411 of the tubular member 41 described above. In this case, by applying the hydrophilic coating 53 to the distal end side outer peripheral edge portion 411 of the cylindrical member 41, the first electrolyte solution E1 can be retained on the distal end side outer periphery of the cylindrical member 41, so that the salt bridge can be formed. The state in which the SB and the first electrolyte solution E1 are electrically connected can be stably maintained.

In some embodiments, as shown in FIG. 5, a hydrophilic coating 53A was applied to the outer surface of the distal closure member 46 described above. In this case, the first electrolyte solution E1 can be retained on the outer surface of the distal end-side closing member 46 by the hydrophilic coating 53A, so that the salt bridge SB and the first electrolyte solution E1 are electrically connected. The state can be kept stable.

In some embodiments, as shown in FIG. 5, a hydrophilic coating 53B was applied to the outer surface of the distal insulating member 48 described above. In this case, the hydrophilic coating 53B allows the outer surface of the distal end side insulating member 48 to retain the first electrolyte solution E1, so that the salt bridge SB and the first electrolyte solution E1 are electrically connected. The state can be kept stable.

In some other embodiments, a hydrophilic coating may be applied to the closure portion 551, the electrode mounting portion 554 and/or the tip portion 553 of the distal closure member 55, as shown in FIG.

In some embodiments, the measurement probe 4 is supported by a probe support device 16, as shown in FIG. In other words, diagnostic system 2 comprises a probe support device 16 configured to support measurement probe 4 .
In the illustrated embodiment, as shown in FIG. 5, the probe support device 16 has a plate-like shape with a through hole 171 into which the tapered tubular portion 41C of the tubular member 41 is inserted from the base end side and locked. A member 17 and a rod-like member 18 each inserted into a plurality of through-holes 172 formed around the through-holes 171 of the plate-like member 17 , and the plate-like member 17 is suspended above the structure 12 . a rod-shaped member 18 configured to support in a state. The through-hole 171 is formed to have a larger diameter than the distal side cylindrical portion 41A and a smaller diameter than the proximal side cylindrical portion 41B.

In the embodiment shown in FIG. 5 , the rod-shaped member 18 has a male threaded portion 181 formed on at least a part of the outer circumference in the length direction to be screwed into the nut 19 . The plate-like member 17 is sandwiched by nuts 19 screwed onto the male screw portions 181 of the bar-like member 18 from both sides in the length direction of the bar-like member 18 in a state in which the bar-like member 18 is inserted through the through hole 172 . , are supported above the structure 12 in a floating state.
Further, in the embodiment shown in FIG. 5 , the bar member 18 has a distal end 182 standing on the second metal member 14 of the structure 12 .

The present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

1 Diagnosis method of deterioration state of coating film 2 Diagnosis system 31 First electrodes 32, 32A, 32B Second electrodes 4, 4A, 4B Measurement probe 40 Tip part 41 Tubular member 41A Tip side tube part 41B Base end side tube Shaped portion 41C Tapered tubular portion 41D Tubular portion 42 Internal space 43 Communication path 44 Outer peripheral surface 45 External openings 46, 51, 55 Distal side closing members 47, 52, 56 Proximal side closing member 48 Distal side insulating member 49 Support rod Member 50 gaskets 53, 53A, 53B hydrophilic coatings 54, 58 coating member 57 metal wire 6 measuring device 61 applying unit 62 measuring unit 63 storage unit 64 diagnosis unit 7A first lead wire 7B second lead wires 7C to 7E lead wire 8 Working electrodes 9, 9A to 9E Test piece 10 Metal member 101 Through hole 102 Opposing surface 103 Exposed parts 11, 15 Coating film 12 Structure 13 Gap 14 Second metal member 16 Probe support device 17 Plate member 18 Rod member 19 Nut E1 First electrolyte solution E2 Second electrolyte solution SB Salt bridge

Claims (8)

A method for diagnosing a deterioration state of a coating film formed on a surface of a metal member, the coating film being formed so as to face a gap provided in a structure including the metal member,
filling the interstices of the structure with a first electrolyte solution;
electrically connecting a first electrode to the first electrolyte solution filled in the gap;
obtaining deterioration state information, which is information about the deterioration state of the coating film, using the first electrode;
and a step of diagnosing the deterioration state of the coating film based on the deterioration state information. contacting a second electrode with the first electrolyte solution filled in the gap;
2. The method for diagnosing a deteriorated state of a coating film according to claim 1, further comprising the step of applying an AC voltage from said second electrode to said first electrolyte solution. A measuring probe used for diagnosing a deterioration state of a coating film formed on a surface of a metal member, the coating film being formed so as to face a gap provided in a structure including the metal member. ,
a tubular member having an internal space;
a first electrode disposed in the interior space, the first electrode configured to be electrically connected to a first electrolyte solution filled in the interstices of the structure. The internal space is filled with a salt bridge, and a second electrolyte solution is stored above the salt bridge,
4. The measuring probe according to claim 3, wherein the first electrode is arranged in the internal space so as to be in contact with the second electrolyte solution. The measurement probe further comprises an insulating tip-side closing member configured to close the tip-side opening of the tubular member,
3. The distal end side closing member is formed with a communication path configured to connect the internal space and the outside of the measurement probe, and the communication path is configured to be filled with a salt bridge. 5. The measuring probe according to 3 or 4. Attached to the measuring probe so as to be insulated from the salt bridge filled in at least one of the internal space and the communication path and electrically connected to the first electrolyte solution filled in the gap further comprising a second electrode with
The measuring probe according to claim 5 . 7. The measuring probe according to claim 6, wherein the second electrode is arranged in an outer circumferential groove provided in the outer circumferential surface of the distal end side closing member along the circumferential direction. 8. The measuring probe according to any one of claims 3 to 7, wherein a hydrophilic coating is applied to the distal end side outer peripheral edge of the cylindrical member.

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