JP2801030B2 - Electrode wire for pipe corrosion protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention relates to a pipe mainly passing water, such as a water pipe.
The present invention relates to an electrode wire for performing electric corrosion protection.

2. Description of the Related Art Conventionally, as a method of applying corrosion protection to a pipe of this type for the purpose of preventing red water or the like, electric corrosion protection is sometimes performed. As an example of the electric corrosion protection method, a method described in Japanese Patent Application Laid-Open No. 63-166983 is known. In this method, an electrode wire is inserted through a wall surface of a part of a pipe to insulate the electrode wire from the pipe, and a positive voltage is applied to the pipe and one electrode wire. Is what you do. As a result, the potential difference of the local battery on the metal surface which causes corrosion of the pipeline is eliminated, and the elution of the metal on the inner surface of the pipeline is prevented to prevent corrosion.

Problems to be Solved by the Invention However, this method has an anticorrosion effect on the metal surface near the portion where the electrode wire is inserted, but the effect is local. Therefore, when the entire pipeline is subjected to corrosion protection by other means such as lining, it is suitable as a method applied only to a portion which may be partially corroded such as a pipe joint or an elbow. If there are a large number of these joints and elbows, the above-mentioned treatment must be performed for each of these joints and elbows. In cases where the entire long pipe is not subjected to corrosion protection, Corrosion protection cannot be imparted to the entire road. Further, in a pipeline or the like that is laid in a wall of a building, an electrode wire cannot be externally attached to an existing pipeline, and the above method cannot be adopted.

Therefore, as shown in FIG. 3, a long electrode wire 2 is inserted into a long pipe line 1, and a voltage is applied between the electrode wire 2 and the pipe line 1 so that the entire long pipe line 1 is formed. It is considered to prevent corrosion. However, since the electrode wire 2 itself is a metal wire, if the metal wire contacts the inner surface of the conduit at a bent portion of the conduit or the like, the voltage will be short-circuited, and the anticorrosion effect cannot be obtained. Further, if a coated electric wire is used so that the metal wire does not contact the inner surface of the conduit, the coated wire is insulated by the coating, so that a voltage cannot be applied, which also cannot provide an anticorrosion effect.

The present invention has been made in view of such circumstances, and has an excellent anti-corrosion effect in the above-described anti-corrosion method,
It is another object of the present invention to provide an electrode wire 2 that does not cause a short circuit with the pipeline 1.

Means for Solving the Problems The first invention of the present application is characterized in that a monofilament yarn of a non-conductive synthetic fiber is roughly spirally wound and coated on the surface of an insoluble metal wire. .
Further, the second invention is characterized in that a monofilament yarn of a non-conductive synthetic fiber is roughly braided into a braided shape and coated on the surface of the insoluble metal wire.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows a monofilament yarn 4 of synthetic fiber on the surface of an insoluble metal wire 3.
Is spirally wound at a coarse pitch.

The insoluble metal wire 3 is a metal wire that does not corrode or elute in water, and for example, a titanium wire plated with platinum is suitable. The thickness is
It is necessary to have a flexibility enough to be inserted into the pipe 1 while bending and maintain a strength enough to withstand the external force due to the water flow for a long period of time. About 2 mm is preferable.

As the monofilament yarn 4, a synthetic fiber having water resistance can be used. For example, polypropylene or polyethylene is suitable. The thickness of the monofilament yarn 4 can be wound around the insoluble metal wire 3 and supports the insoluble metal wire 3 in the pipe 1 so as not to contact the inner surface of the pipe 1. Sano 20
About 200% is appropriate. Monofilament yarn 4
The pitch at which the wire is wound around the insoluble metal wire 3 depends on the thickness of the monofilament yarn 4, but is 1 to 1 times the diameter of the insoluble metal wire 3.
It is good to make it about 5 times. In addition, it is preferable that the wound monofilament yarn 4 is heat-set and contracted, and fixed in a state where the monofilament yarn 4 is in close contact with the insoluble metal wire 3.

FIG. 2 shows the insoluble metal wire 3 coated with a monofilament yarn 4 roughly braided into a braid.

In this structure, the insoluble metal wire 3 and the monofilament yarn 4 can be the same as those shown in FIG. 1, but the thickness of the monofilament yarn 4 is smaller than that of FIG. It is appropriate to set the thickness to about 10 to 100% of the thickness of the sheet.

In the present invention, since the monofilament yarn 4 is roughly spirally wound around the surface of the insoluble metal wire 3 or roughly braided into a braid to cover the surface, when the electrode wire 2 comes into contact with the inner surface of the conduit 1. The monofilament yarn 4 supports the insoluble metal wire 3 due to its rigidity, and the insoluble metal wire 3 does not directly contact the inner surface of the pipeline 1.

Further, since the monofilament yarn 4 is coarsely wound or braided on the surface of the insoluble metal wire 3, the insoluble metal wire 3 is widely exposed to water, and the insoluble metal wire 3 is insoluble in the pipeline 1 by the applied anticorrosion voltage. The amount of current flowing between the metal wire 3 and the metal wire 3 is large, and an anticorrosion effect can be effectively provided to the inner surface of the pipeline 1.

Example In order to confirm the effect of the present invention, an electrode wire 2 of the present invention was manufactured by winding a polypropylene monofilament having a diameter of 0.8 mm around a platinum-plated titanium wire having a diameter of 1.0 mm at a pitch of 2.0 mm.

For comparison, a wool having an apparent thickness of 0.8 mm wound around the same titanium wire at the same pitch and the bare titanium wire were prepared.

Each of the above-mentioned electrode wires 2 has a length of 10 cm in water.
And a 5 cm square iron plate were suspended at 10 cm intervals, a voltage was applied between the electrode wire 2 and the iron plate while stirring water, and the amount of current between the electrodes was measured.

As a result, as shown in FIG. 4, it was found that the current of the present invention was larger than that of a wound yarn and showed a value close to that of a bare platinum-plated titanium wire.

Although the reason why such a phenomenon occurs is not always clear, it is thought to be due to the following reason.

That is, by applying a voltage, the insoluble metal wire 3
The movement of ions occurs between the wire and the inner surface of the conduit 1, thereby causing a current to flow. In the case where the yarn is wound on the surface of the insoluble metal wire 3, the yarn is crushed when the yarn is wound. And becomes partially flat, and partially covers the surface of the insoluble metal wire 3 and hinders the flow of water contained inside the yarn. Therefore, the movement speed of the water ions in the wool is slowed, and the insoluble metal wire 3 in the portion where the wool is wound does not contribute to conductivity even if it is in contact with the water contained in the wool. It is considered that only the portion not covered with the yarn contributes to the conductivity, and the area is small, so that the current amount is greatly reduced. This phenomenon is considered to be the same even when a synthetic fiber multifilament yarn or spun yarn is used instead of the wool.

On the other hand, in the present invention, as shown in FIG. 1, by winding the monofilament yarn 4 around the insoluble metal wire 3, the cross-sectional shape of the monofilament yarn 4 does not collapse, and the contact area with the insoluble metal wire 3 is reduced. The contact area of the small insoluble metal wire 3 with water is large. In addition, the water that is in contact with the insoluble metal wire 3 is constantly replaced by the water flow, so that the water does not partially stay and the ion moving speed is not slowed down, and effectively contributes to conductivity over a wide area. Therefore, it is considered that the amount of current flowing from the insoluble metal wire 3 is larger in the case of the present invention than in the case of winding a yarn.

Therefore, according to the present invention, as shown in FIG.
When the electrode wire 2 comes into contact with the conduit 1, the monofilament yarn 4 effectively turns the insoluble metal wire 3
, And the insoluble metal wire 3 does not directly contact the inner surface of the pipeline 1 and there is no short circuit.

Further, according to the present invention, since the monofilament yarn 4 of the insoluble metal wire 3 is wound or braided in a braided shape, the contact area between the insoluble metal wire 3 and the monofilament yarn 4 is small, and the spun yarn or multifilament is used. When wound around an insoluble metal wire 3 like a thread, it collapses and becomes flat,
Water is not contained in the yarn to prevent the flow. Therefore, a large area on the surface of the insoluble metal wire 3 contributes to conductivity, and the amount of current when a voltage is applied is close to that of the bare insoluble metal wire 3, so that a large anticorrosion effect can be obtained.

Further, since the monofilament yarn 4 is more excellent in abrasion resistance than the spun yarn or the multifilament yarn, the monofilament yarn 4 has more durability than the spun yarn or the multifilament yarn even in the abrasion of the pipe line 1 due to the water flow. Further, since the coefficient of wear is small, the work is easy even when the electrode wire 2 is inserted into the conduit 1.

[Brief description of the drawings]

FIG. 1 and FIG. 2 are front views each showing an embodiment of an electrode wire of the present invention. FIG. 3 is a conceptual diagram showing a use state of the electrode wires, and FIG. 4 is a graph showing a change in a current amount when a voltage is applied to various electrode wires. 1 ... pipeline, 2 ... electrode wire 3 ... insoluble metal wire, 4 ... monofilament yarn

Claims (2)

(57) [Claims] 1. An electrode wire for corrosion protection of a pipe, wherein a monofilament yarn of a non-conductive synthetic fiber is roughly wound around a surface of an insoluble metal wire in a spiral manner. 2. An electrode wire for corrosion protection of conduits, wherein a monofilament yarn of non-conductive synthetic fiber is roughly braided and covered in a braided shape on the surface of an insoluble metal wire.