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JP6804863B2 - Film soundness evaluation method - Google Patents
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JP6804863B2 - Film soundness evaluation method - Google Patents

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JP6804863B2
JP6804863B2 JP2016083196A JP2016083196A JP6804863B2 JP 6804863 B2 JP6804863 B2 JP 6804863B2 JP 2016083196 A JP2016083196 A JP 2016083196A JP 2016083196 A JP2016083196 A JP 2016083196A JP 6804863 B2 JP6804863 B2 JP 6804863B2
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JP2017194299A (en
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義行 川瀬
義行 川瀬
研介 西山
研介 西山
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日鉄防食株式会社
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Description

本発明は被膜健全性評価方法に関する。 The present invention relates to a film soundness evaluation method.

例えば、鋼管の内面に防食塗膜を塗装してなる配管は、その防食塗膜が鋼管に密着していることが必要であるものの、継続して使用していれば継時的に防食塗膜が劣化し、その密着の程度が必ず低下していく。
ここで、防食塗膜が剥がれてしまっては配管に不具合が生じる可能性があるため、定期的に検査することで防食被膜の鋼管への密着度合いを把握し、必要に応じて、補修することが重要である。
また、防食塗膜の鋼管への密着度合いの劣化の程度を予測し、補修すべき時期を予め知ることができれば、定修時のスケジュールを組みやすいという点で好ましい。 For example, in a pipe in which an anticorrosion coating is applied to the inner surface of a steel pipe, the anticorrosion coating needs to be in close contact with the steel pipe, but if it is used continuously, the anticorrosion coating will be applied over time. Deteriorates, and the degree of adhesion always decreases.
Here, if the anticorrosion coating film is peeled off, there is a possibility that the piping will malfunction. Therefore, the degree of adhesion of the anticorrosion coating film to the steel pipe should be grasped by regular inspection and repaired if necessary. is important.
Further, it is preferable that the degree of deterioration of the degree of adhesion of the anticorrosion coating film to the steel pipe can be predicted and the time to be repaired can be known in advance, because it is easy to set a schedule for regular repair.

上記のような内面の防食塗膜の配管への密着度合いの程度の把握は、配管の外部から行う必要がある。使用時において配管はその内部にガスや水などが流れているからである。 It is necessary to grasp the degree of adhesion of the anticorrosion coating film on the inner surface to the pipe from the outside of the pipe as described above. This is because gas, water, etc. are flowing inside the pipe during use.

本発明の目的は、部材の内面に被膜が付いてなる構造物において、鋼管等の部材の内面に付いている被膜の前記部材へ密着の程度を、外側からの測定によって把握することができ、定期的に測定すれば被膜の劣化予測を行うことができる、被膜健全性評価方法を提供することである。 An object of the present invention is that in a structure having a coating film on the inner surface of a member, the degree of adhesion of the coating film attached to the inner surface of a member such as a steel pipe to the member can be grasped by measurement from the outside. It is to provide a film soundness evaluation method capable of predicting deterioration of a film if it is measured regularly.

本発明者は鋭意検討し、上記課題を解決する方法を見出して本発明を完成させた。
本発明は次の（１）〜（３）である。
（１）部材の内面Ａに被膜が付いている構造物における、前記被膜の前記内面Ａへの密着度合いを外面から求め、評価する、被膜健全性評価方法であって、
前記部材の外面Ｂから前記内面Ａへ超音波パルスを入射する入射工程と、
前記部材の前記内面Ａと前記被膜の外面Ｄとの界面αで反射する第１反射波を受信する受信工程［１］と、
前記第１反射波および前記構造物の内部と前記被膜の内面Ｃとの界面βで反射する第２反射波の合成反射波を受信する受信工程［２］と、
前記第１反射波に対する前記第２反射波の強度の比を算出し、この比から前記被膜の前記外面Ｄの前記内面Ａへの密着度合いを求め、評価する評価工程と、
を備える、被膜健全性評価方法。
（２）前記部材が鋼材であり、前記被膜が有機物を主成分とする防食塗膜である、上記（１）に記載の被膜健全性評価方法。
（３）前記部材が鋼管であり、その内部に気体、液体および固体からなる群から選ばれる少なくとも１つが流動しているときに行う、上記（１）または（２）に記載の被膜健全性評価方法。 The present inventor has diligently studied and found a method for solving the above problems to complete the present invention.
The present invention is the following (1) to (3).
(1) A coating soundness evaluation method for obtaining and evaluating the degree of adhesion of the coating to the inner surface A of a structure having a coating on the inner surface A of the member from the outer surface.
An incident step of injecting an ultrasonic pulse from the outer surface B of the member to the inner surface A, and
The receiving step [1] of receiving the first reflected wave reflected at the interface α between the inner surface A of the member and the outer surface D of the coating film.
A receiving step [2] of receiving the first reflected wave and the combined reflected wave of the second reflected wave reflected at the interface β between the inside of the structure and the inner surface C of the coating film.
An evaluation step in which the ratio of the intensity of the second reflected wave to the first reflected wave is calculated, and the degree of adhesion of the outer surface D of the coating film to the inner surface A is obtained from this ratio and evaluated.
A method for evaluating film soundness.
(2) The coating film soundness evaluation method according to (1) above, wherein the member is a steel material and the coating film is an anticorrosion coating film containing an organic substance as a main component.
(3) The film soundness evaluation according to (1) or (2) above, which is performed when the member is a steel pipe and at least one selected from the group consisting of gas, liquid and solid is flowing inside the steel pipe. Method.

本発明によれば、部材の内面に被膜が付いてなる構造物において、鋼管等の部材の内面に付いている被膜の前記部材へ密着の程度を、外側からの測定によって把握することができ、定期的に測定すれば被膜の劣化予測を行うことができる、被膜健全性評価方法を提供することができる。 According to the present invention, in a structure having a coating film on the inner surface of a member, the degree of adhesion of the coating film attached to the inner surface of a member such as a steel pipe to the member can be grasped by measurement from the outside. It is possible to provide a film soundness evaluation method capable of predicting deterioration of the film if it is measured regularly.

図１は、本発明における構造物に該当する配管１０の断面一部拡大図である。FIG. 1 is a partially enlarged cross-sectional view of the pipe 10 corresponding to the structure in the present invention. 図２は、本発明の評価方法を実施することができる測定装置の概略図である。FIG. 2 is a schematic view of a measuring device capable of carrying out the evaluation method of the present invention. 図３は、測定データの例を示すグラフである。FIG. 3 is a graph showing an example of measurement data. 図４は、測定データの別の例を示すグラフである。FIG. 4 is a graph showing another example of the measurement data. 図５は、強度Ｚ2／強度Ｚ1と内面塗膜密着力の保持率との関係の例を示すグラフである。FIG. 5 is a graph showing an example of the relationship between the strength Z 2 / strength Z 1 and the retention rate of the inner surface coating film adhesion.

本発明の被膜健全性評価方法（以下、単に「本発明の評価方法」ともいう）について、図を用いて説明する。
図１は本発明の評価方法における構造物に該当する配管１０の断面一部拡大図である。図１において配管１０（構造物）は、鋼管１２（部材）の内面に被膜１４が付いてなるものとする。 The film soundness evaluation method of the present invention (hereinafter, also simply referred to as “the evaluation method of the present invention”) will be described with reference to the drawings.
FIG. 1 is a partially enlarged cross-sectional view of the pipe 10 corresponding to the structure in the evaluation method of the present invention. In FIG. 1, the pipe 10 (structure) is formed by having a coating film 14 on the inner surface of the steel pipe 12 (member).

本発明の評価方法は、鋼管１２の内面Ａに被膜１４が付いている配管１０における、被膜１４の内面Ａへの密着度合いを外面Ｂから求め、評価する、被膜健全性評価方法であって、鋼管１２の外面Ｂから内面Ａへ超音波パルスを入射する入射工程と、鋼管１２の内面Ａと被膜１４の外面Ｄとの界面αで反射する第１反射波Ｐ1を受信する受信工程［１］と、第１反射波Ｐ1および配管１０の内部（図１では液体Ｗ）と被膜１４の内面Ｃとの界面βで反射する第２反射波Ｐ2の合成反射波Ｐmを受信する受信工程［２］と、第１反射波Ｐ1に対する第２反射波Ｐ2の強度の比を算出し、この比から被膜１４の外面Ｄの内面Ａへの密着度合いを求め、評価する評価工程と、を備える、被膜健全性評価方法である。 The evaluation method of the present invention is a film soundness evaluation method in which the degree of adhesion of the coating film 14 to the inner surface A of the pipe 10 having the coating film 14 on the inner surface A of the steel pipe 12 is obtained from the outer surface B and evaluated. An incident step of injecting an ultrasonic pulse from the outer surface B of the steel pipe 12 to the inner surface A, and a receiving step of receiving the first reflected wave P 1 reflected at the interface α between the inner surface A of the steel pipe 12 and the outer surface D of the coating film 14 [1] ] And the combined reflected wave P m of the second reflected wave P 2 reflected at the interface β between the first reflected wave P 1 and the inside of the pipe 10 (liquid W in FIG. 1) and the inner surface C of the coating film 14. An evaluation step in which the ratio of the intensity of the second reflected wave P 2 to the first reflected wave P 1 is calculated, and the degree of adhesion of the outer surface D of the coating film 14 to the inner surface A is obtained from this ratio and evaluated. This is a film soundness evaluation method comprising.

本発明の評価方法は、例えば図２に示す測定装置を用いて実施することができる。
図２は、本発明の評価方法を実施することができる測定装置の概略図である。
測定装置１は、パーソナルコンピューター７により制御されるパルサー２ａで超音波パルスを発生し、探触子３を介して配管１０の外面Ｂから配管１０の中心に向かって垂直に超音波パルスを送信する（入射工程）。
送信された超音波パルスは、まず鋼管１２の内面Ａと被膜１４の外面Ｄとの界面αにおいて反射し、第１反射波Ｐ1として探触子３側に復帰する（受信工程［１］）。
また、送信された超音波パルスは配管１０の内部（図１に示す場合は水Ｗ）と被膜１４の内面Ｃとの界面βにおいて反射し、第２反射波Ｐ2として探触子３側に復帰する。ここで第２反射波Ｐ2は第１反射波Ｐ1と合成された合成反射波として、探触子３側で受信される（受信工程［２］）。 The evaluation method of the present invention can be carried out using, for example, the measuring device shown in FIG.
FIG. 2 is a schematic view of a measuring device capable of carrying out the evaluation method of the present invention.
The measuring device 1 generates an ultrasonic pulse by the pulsar 2a controlled by the personal computer 7, and transmits the ultrasonic pulse vertically from the outer surface B of the pipe 10 toward the center of the pipe 10 via the probe 3. (Incident process).
The transmitted ultrasonic pulse is first reflected at the interface α between the inner surface A of the steel pipe 12 and the outer surface D of the coating film 14, and returns to the probe 3 side as the first reflected wave P 1 (reception step [1]). ..
Further, the transmitted ultrasonic pulse is reflected at the interface β between the inside of the pipe 10 (water W in the case of FIG. 1) and the inner surface C of the coating film 14, and is reflected on the probe 3 side as the second reflected wave P 2. Return. Here, the second reflected wave P 2 is received on the probe 3 side as a combined reflected wave combined with the first reflected wave P 1 (reception step [2]).

これらの第１反射波Ｐ1、第２反射波Ｐ2は、レシーバー２ｂおよびプリアンプ４により増幅され、フィルター５によりノイズが除去された状態でＡ／Ｄコンバーター６によりデジタル信号に変換され、パーソナルコンピューター７で処理される。第１反射波Ｐ1、第２反射波Ｐ2はレシーバー２ｂにて補足され、モニター８に表示される。ここで正確には、第２反射波Ｐ2は第１反射波Ｐ1との合成反射波Ｐmとして補足され、モニター８に表示される。 These first reflected wave P 1 and second reflected wave P 2 are amplified by the receiver 2b and the preamplifier 4, are converted into digital signals by the A / D converter 6 with noise removed by the filter 5, and are converted into digital signals by a personal computer. Processed in 7. The first reflected wave P 1 and the second reflected wave P 2 are captured by the receiver 2b and displayed on the monitor 8. Here, to be precise, the second reflected wave P 2 is supplemented as a combined reflected wave P m with the first reflected wave P 1 and displayed on the monitor 8.

例えば図２に示した測定装置を用いて図１に示した配管１０について、本発明の評価方法を適用すると、図３、図４に示すようなデータが得られる。 For example, when the evaluation method of the present invention is applied to the pipe 10 shown in FIG. 1 using the measuring device shown in FIG. 2, the data shown in FIGS. 3 and 4 can be obtained.

ここで図３は、被膜１４の外面Ｄが鋼管１２の内面Ａと健全に密着している場合に得られるデータの例を示している。横軸（Ｘ軸）が時間、縦軸（Ｙ軸）は反射波の強度を示している。
探触子３を介して配管１０の外面Ｂから配管１０の中心に向かって垂直に超音波パルスを送信すると、送信された超音波パルスは、初めに鋼管１２の外面Ｂで反射するので、その反射波が受信される。次に、鋼管１２の内面Ａと被膜１４の外面Ｄとの界面αにおいて反射し、第１反射波Ｐ1として探触子３側で受信される。ここで受信した第１反射波Ｐ1の強度を強度Ｚ1とする。
次に、送信された超音波パルスは配管１０の内部（図１に示す場合は水Ｗ）と被膜１４の内面Ｃとの界面βにおいて反射し、第２反射波Ｐ2として探触子３側で受信される。ここで第２反射波Ｐ2は第１反射波Ｐ1と合成された合成反射波Ｐmとして、探触子３側で受信されるが、図３に示すように、その合成反射波における第２反射波Ｐ2に由来する部分が確認できる。ここで受信した第２反射波Ｐ2の強度を強度Ｚ2とする。なお、ここで得られる第２反射波Ｐ2およびその強度は、正確には、合成反射波Ｐmにおける第２反射波Ｐ2に由来する部分およびその強度を意味しているが、本明細書ではそれらを区別せずに記載している場合がある。 Here, FIG. 3 shows an example of data obtained when the outer surface D of the coating film 14 is in good contact with the inner surface A of the steel pipe 12. The horizontal axis (X-axis) shows time, and the vertical axis (Y-axis) shows the intensity of reflected waves.
When an ultrasonic pulse is transmitted vertically from the outer surface B of the pipe 10 toward the center of the pipe 10 via the probe 3, the transmitted ultrasonic pulse is first reflected by the outer surface B of the steel pipe 12, so that the ultrasonic pulse is reflected first. The reflected wave is received. Next, it is reflected at the interface α between the inner surface A of the steel pipe 12 and the outer surface D of the coating film 14, and is received as the first reflected wave P 1 on the probe 3 side. The intensity of the first reflected wave P 1 received here is defined as the intensity Z 1 .
Next, the transmitted ultrasonic pulse is reflected at the interface β between the inside of the pipe 10 (water W in the case of FIG. 1) and the inner surface C of the coating film 14, and is reflected on the probe 3 side as the second reflected wave P 2. Received at. Here, the second reflected wave P 2 is received on the probe 3 side as the combined reflected wave P m combined with the first reflected wave P 1, and as shown in FIG. 3, the second reflected wave in the combined reflected wave P m . 2 The part derived from the reflected wave P 2 can be confirmed. The intensity of the second reflected wave P 2 received here is defined as the intensity Z 2 . The second reflected wave P 2 and its intensity obtained here mean, to be exact, a portion of the combined reflected wave P m derived from the second reflected wave P 2 and its intensity. Then, they may be described without distinction.

そして、本発明者は、外面Ｄと内面Ａとの密着の度合いと、強度Ｚ2／強度Ｚ1との間に正の相関があることを見出した。つまり、外面Ｄと内面Ａとの密着の度合いが高いと強度Ｚ2／強度Ｚ1の値も高くなることを見出した。また、この値を定期的に測定すれば被膜の劣化を予測することができることを、本発明者は見出した。 Then, the present inventor has found that there is a positive correlation between the degree of adhesion between the outer surface D and the inner surface A and the strength Z 2 / strength Z 1 . That is, it has been found that the higher the degree of adhesion between the outer surface D and the inner surface A, the higher the value of strength Z 2 / strength Z 1 . In addition, the present inventor has found that deterioration of the coating film can be predicted by measuring this value on a regular basis.

ここで、外面Ｄと内面Ａとの密着の度合いが低く、例えば、外面Ｄと内面Ａとが全く接触していない場合、図４に示すようなデータが得られる。
すなわち、探触子３を介して配管１０の外面Ｂから配管１０の中心に向かって垂直に超音波パルスを送信すると、送信された超音波パルスは、初めに鋼管１２の外面Ｂで反射するので、その反射波が受信され、次に、鋼管１２の内面Ａと被膜１４の外面Ｄとの界面αにおいて反射し、第１反射波Ｐ1として探触子３側で受信されるが、第２反射波Ｐ2に相当する部分が確認できないデータである。
この場合、強度Ｚ2／強度Ｚ1の値はゼロということなる。 Here, when the degree of adhesion between the outer surface D and the inner surface A is low, for example, when the outer surface D and the inner surface A are not in contact with each other, the data as shown in FIG. 4 can be obtained.
That is, when an ultrasonic pulse is transmitted vertically from the outer surface B of the pipe 10 toward the center of the pipe 10 via the probe 3, the transmitted ultrasonic pulse is first reflected by the outer surface B of the steel pipe 12. the reflected wave is received, then reflected at the interface α between the outer surface D of the inner surface a and the film 14 of the steel pipe 12, but are received by the first reflected wave P 1 as probe 3 side, second This is the data in which the part corresponding to the reflected wave P 2 cannot be confirmed.
In this case, the value of intensity Z 2 / intensity Z 1 is zero.

強度Ｚ2／強度Ｚ1と内面塗膜密着力の保持率との関係を示すと、例えば図５に示すような正の相関図が得られることを、本発明者は見出した。
強度Ｚ2／強度Ｚ1と内面塗膜密着力の保持率との関係は、対象物（構造物）の種類等によって異なるが、例えば、強度Ｚ2／強度Ｚ1×１００で３０％程度のあると、内面塗膜密着力の保持率が９０％程度であることが多い。この場合、保持率が高いので補修する必要はない。強度Ｚ2／強度Ｚ1×１００で１０％程度のあると、内面塗膜密着力の保持率が３０％程度であることが多い。この場合、保持率が低いので補修する必要がある。強度Ｚ2／強度Ｚ1×１００の値を定期的に測定してれば、将来において、例えば強度Ｚ2／強度Ｚ1×１００が１０％程度にある時期を予測できる。すなわち、上記のような方法で、鋼管等の構造物の内部の被膜が構造物に密着している程度を定期的に測定することで図５に示すグラフを得ることができれば、被膜の劣化予測を行うことができる。このような予測を得ることができれば、適切な補修タイミングを知り、工場の定修日等を考慮した補修スケジュールを立てることができるので、極めて有効である。 The present inventor has found that when the relationship between the strength Z 2 / strength Z 1 and the retention rate of the inner surface coating film adhesion is shown, for example, a positive correlation diagram as shown in FIG. 5 can be obtained.
The relationship between the strength Z 2 / strength Z 1 and the retention rate of the inner surface coating film adhesion varies depending on the type of the object (structure), etc., but for example, the strength Z 2 / strength Z 1 × 100 is about 30%. If there is, the retention rate of the inner surface coating film adhesion is often about 90%. In this case, since the retention rate is high, there is no need to repair. When the strength Z 2 / strength Z 1 × 100 is about 10%, the retention rate of the inner surface coating film adhesion is often about 30%. In this case, the retention rate is low and needs to be repaired. If the value of the intensity Z 2 / intensity Z 1 × 100 if periodically measuring, in the future, for example, the intensity Z 2 / intensity Z 1 × 100 can predict when in the order of 10%. That is, if the graph shown in FIG. 5 can be obtained by periodically measuring the degree to which the coating film inside the structure such as a steel pipe is in close contact with the structure by the above method, deterioration prediction of the coating film can be predicted. It can be performed. If such a prediction can be obtained, it is extremely effective because it is possible to know an appropriate repair timing and to make a repair schedule in consideration of the fixed repair date of the factory.

本発明の評価方法は、部材の内面Ａに被膜が付いている構造物を対象とする。
このような構造物に該当するものとして、例えば、内部に防食塗膜が付いているガス配管、蒸気配管、水や石油等が流れる配管が挙げられる。このような配管は製鉄所内、火力発電所内、石油精製コンビナート内で利用されており、使用を継続すれば時間の経過と共に被膜が劣化し、その密着の程度が低下するので、防食被膜の配管への密着度合いを把握し、その密着度合いによって、剥がれる前に補修することが重要である。また、通常、このような配管内にはガス、水、石油などが流れているため、配管の外部から内部の被膜の状態を把握する必要がある。
構造物として、他にも、タンクや圧力容器が挙げられる。 The evaluation method of the present invention targets a structure having a coating on the inner surface A of the member.
Examples of such a structure include a gas pipe having an anticorrosion coating film inside, a steam pipe, and a pipe through which water, oil, etc. flow. Such pipes are used in steel mills, thermal power plants, and oil refineries, and if they continue to be used, the coating will deteriorate over time and the degree of adhesion will decrease. It is important to understand the degree of adhesion of the oil and repair it before it peels off depending on the degree of adhesion. Further, since gas, water, oil, etc. usually flow in such a pipe, it is necessary to grasp the state of the coating film inside from the outside of the pipe.
Other structures include tanks and pressure vessels.

部材の厚さ（図１の場合であれば鋼管１２の厚さが相当する）は特に限定されず、例えば３ｍｍ〜２０ｍｍの範囲のものに好ましく適用することができる。 The thickness of the member (corresponding to the thickness of the steel pipe 12 in the case of FIG. 1) is not particularly limited, and for example, it can be preferably applied to those in the range of 3 mm to 20 mm.

本発明の評価方法において被膜は特に限定されないが、有機物を主成分（概ね７０質量％以上含むことを意味するものとする）とする防食塗膜であることが好ましい。このような防食塗膜としてエポキシ樹脂やウレタン樹脂等からなるものや、さらにこれらの有機樹脂に亜鉛粉末を含んだものが例示される。
皮膜の厚さは特に限定されず、例えば１０μｍ〜５，０００μｍの範囲のものに好ましく適用することができる。 In the evaluation method of the present invention, the coating film is not particularly limited, but an anticorrosion coating film containing an organic substance as a main component (meaning that it contains approximately 70% by mass or more) is preferable. Examples of such an anticorrosion coating film include those made of epoxy resin, urethane resin, and the like, and those containing zinc powder in these organic resins.
The thickness of the film is not particularly limited, and for example, it can be preferably applied to those in the range of 10 μm to 5,000 μm.

なお、本発明の評価方法の入射工程において用いる超音波パルスは、超音波であることが好ましいが、超音波に近い波長を有する音波等であってよい。 The ultrasonic pulse used in the incident step of the evaluation method of the present invention is preferably an ultrasonic wave, but may be a sound wave having a wavelength close to that of the ultrasonic wave.

Claims (3)

部材の内面Ａに被膜が付いている構造物における、前記被膜の前記内面Ａへの密着度合いを外面から求め、評価する、被膜健全性評価方法であって、
前記部材の外面Ｂから前記内面Ａへ超音波パルスを入射する入射工程と、
前記部材の前記内面Ａと前記被膜の外面Ｄとの界面αで反射する第１反射波を受信する受信工程［１］と、
前記第１反射波および前記構造物の内部と前記被膜の内面Ｃとの界面βで反射する第２反射波の合成反射波を受信する受信工程［２］と、
前記第１反射波の強度Ｚ1に対する前記第２反射波の強度Ｚ2の比（強度Ｚ2／強度Ｚ1×１００）を算出し、この比の算出を継続して行って強度Ｚ2／強度Ｚ1×１００＝１０となる補修タイミングを予測する工程と、
を備える、被膜健全性評価方法。 A coating soundness evaluation method for obtaining and evaluating the degree of adhesion of the coating to the inner surface A from the outer surface in a structure having a coating on the inner surface A of the member.
An incident step of injecting an ultrasonic pulse from the outer surface B of the member to the inner surface A, and
The receiving step [1] of receiving the first reflected wave reflected at the interface α between the inner surface A of the member and the outer surface D of the coating film.
A receiving step [2] of receiving the first reflected wave and the combined reflected wave of the second reflected wave reflected at the interface β between the inside of the structure and the inner surface C of the coating film.
The second reflected wave ratio of the intensities Z 2 of relative intensity Z 1 of the first reflected wave (intensity Z 2 / intensity Z 1 × 100) was calculated, the strong degree carried out to continue the calculation of the ratio Z 2 / The process of predicting the repair timing when the strength Z 1 x 100 = 10 and
A method for evaluating film soundness. 前記部材が鋼材であり、前記被膜が有機物を主成分とする防食塗膜である、請求項１に記載の被膜健全性評価方法。 The film soundness evaluation method according to claim 1, wherein the member is a steel material, and the film is an anticorrosion coating film containing an organic substance as a main component. 前記部材が鋼管であり、その内部に気体、液体および固体からなる群から選ばれる少なくとも１つが流動しているときに行う、請求項１または２に記載の被膜健全性評価方法。 The film soundness evaluation method according to claim 1 or 2, wherein the member is a steel pipe, and at least one selected from the group consisting of gas, liquid, and solid is flowing inside the steel pipe.
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