JP3181153B2 - Coating defect detection method - Google Patents
Coating defect detection methodInfo
- Publication number
- JP3181153B2 JP3181153B2 JP21089093A JP21089093A JP3181153B2 JP 3181153 B2 JP3181153 B2 JP 3181153B2 JP 21089093 A JP21089093 A JP 21089093A JP 21089093 A JP21089093 A JP 21089093A JP 3181153 B2 JP3181153 B2 JP 3181153B2
- Authority
- JP
- Japan
- Prior art keywords
- coating film
- conductive coating
- insulating coating
- short
- conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、海洋構造物の導電塗膜
による電解防汚装置における塗膜の施工欠陥部の検出法
に関し、特に海洋構造物の金属製外板における海水との
接触部に施工される絶縁塗膜の施工不良部（ピンホー
ル）の検出を、絶縁塗膜の上に導電塗膜を施工後に行な
えるようにした、塗膜欠陥検出法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a defective portion of a coating film in an electrolytic antifouling apparatus using a conductive coating film of a marine structure, and more particularly to a method of detecting a contact portion of a metal outer panel of a marine structure with seawater. The present invention relates to a coating film defect detection method capable of detecting a poorly-formed portion (pinhole) of an insulating coating film applied to an insulating coating film after the conductive coating film is applied on the insulating coating film.
【０００２】[0002]
【従来の技術】従来、船舶や洋上石油基地のような海洋
構造物では、その金属製外板の海水との接触部に絶縁塗
膜を介して導電塗膜を施工し、これを陽極として微少電
流を流しその表面上で海水を電気分解させて海洋構造物
の付着を防止するようにした海洋構造物の防汚システム
が提案されている（例えば特開昭61-247032号）。2. Description of the Related Art Conventionally, in a marine structure such as a ship or an offshore petroleum base, a conductive coating film is applied to a contact portion of a metal outer plate with seawater via an insulating coating film, and the conductive coating film is used as an anode. 2. Description of the Related Art An antifouling system for an offshore structure has been proposed in which an electric current is applied to electrolyze seawater on the surface to prevent the offshore structure from adhering (for example, Japanese Patent Application Laid-Open No. 61-247032).
【０００３】[0003]
【発明が解決しようとする課題】ところで、このような
防汚システムでは、絶縁塗膜に施工の不手際によるピン
ホールがあると、海洋構造物と導電塗膜との間にピンホ
ールを介して短絡部が発生し、導電塗膜に流した電流の
一部がその短絡部より直接海洋構造物に流れるため、欠
陥短絡部周辺の防汚性能が低下し、十分な防汚性能が得
られないという不都合がある。その対策として、従来は
絶縁塗膜施工時に欠陥部（ピンホール）がないことをピ
ンホール検査計により入念に検査し、その上に導電塗膜
を施工している。By the way, in such an antifouling system, if there is a pinhole in the insulating coating film due to improper installation, a short circuit occurs between the marine structure and the conductive coating film via the pinhole. A part of the current flows through the conductive coating film and a part of the current flows directly to the marine structure from the short-circuit part, so that the anti-fouling performance around the defective short-circuit part is reduced, and sufficient anti-fouling performance cannot be obtained. There are inconveniences. Conventionally, as a countermeasure, a pinhole inspection meter carefully inspects for a defect (pinhole) during the application of an insulating coating film, and a conductive coating film is applied thereon.
【０００４】小型船など施工面積が小さいものは入念な
調査も可能であるが、施工面積が何万m2という大型船舶
などでは入念なピンホール検査は実際上不可能であると
いう問題点がある。本発明は、このような問題点の解決
をはかろうとするもので、導電塗膜の施工後に簡単な手
順で絶縁塗膜のピンホールの検出が行なえるようにし
た、塗膜欠陥検出法を提供することを目的とする。[0004] those construction area, such as a small boat is small, but it is also possible to careful research, in such large vessels that construction area of tens of thousands of m 2 is elaborate pinhole inspection there is a problem that it is practically impossible . The present invention seeks to solve such a problem, and a method of detecting a coating film defect that enables detection of pinholes in an insulating coating film in a simple procedure after application of a conductive coating film. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
め、本発明の塗膜欠陥検出法は、海洋構造物における金
属製外板の海水との接触部に絶縁塗膜を介して施工され
た導電塗膜をそなえた海洋生物付着防止装置において、
上記絶縁塗膜の施工不良部の検出を上記導電塗膜の施工
後に行なうに際し、同導電塗膜と上記外板との間に電圧
を負荷して上記施工不良部に短絡電流による発熱を生じ
させ、同発熱により発生する赤外線量を測定して上記絶
縁塗膜の施工不良部の検出を行なうようにしたことを特
徴としている。In order to achieve the above-mentioned object, a method for detecting a coating defect according to the present invention is carried out by applying an insulating coating to a contact portion of a metal outer plate of a marine structure with seawater. In a marine organism adhesion prevention device with a conductive coating
When performing the detection of the poorly applied portion of the insulating coating after the conductive coating is applied, a voltage is applied between the conductive coating and the outer plate to generate heat due to a short-circuit current in the poorly applied portion. The method is characterized in that the amount of infrared rays generated by the heat generation is measured to detect the poorly applied portion of the insulating coating film.
【０００６】[0006]
【作用】上述の本発明の塗膜欠陥検出法では、海洋構造
物における金属製外板と導電塗膜との間に電圧をかける
と、絶縁塗膜にピンホールがあるとき、そのところで外
板と導電塗膜とが短絡して短絡電流が流れ、その部分が
ジュール熱で発熱し他の正常部と温度差が生じる。この
温度差を赤外線発生量差から検出してピンホールを検出
することができる。According to the above-described method for detecting a coating film defect of the present invention, when a voltage is applied between a metal outer plate and a conductive coating film in an offshore structure, if there is a pinhole in the insulating coating film, the outer plate is located there. And the conductive coating film is short-circuited, causing a short-circuit current to flow, which generates heat due to Joule heat and causes a temperature difference from other normal parts. This temperature difference can be detected from the difference in the amount of generated infrared rays to detect a pinhole.
【０００７】[0007]
【実施例】以下、図面により本発明の一実施例としての
塗膜欠陥検出法について説明すると、図１は鋼板製の船
体ブロックに実施した場合の模式側断面図である。この
実施例では、海洋構造物としての鋼製の船体ブロックを
例にしており、船体ブロック１の表面に、エポキシ系塗
料による厚さ300μｍの絶縁塗膜２が施工され、この絶
縁塗膜２の施工面上端部に、被覆銅線６をハンダ付けさ
れた通電用の銅箔４（幅30mm，厚さ100μｍ）が両面テ
ープではりつけられている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional side view of a method for detecting a coating film defect according to an embodiment of the present invention. In this embodiment, a hull block made of steel as an offshore structure is taken as an example, and an insulating coating film 2 having a thickness of 300 μm made of epoxy-based paint is applied to the surface of the hull block 1. A copper foil 4 (30 mm in width, 100 μm in thickness) for energization to which a coated copper wire 6 is soldered is attached to the upper end of the construction surface with a double-sided tape.
【０００８】さらに、銅箔４上を含めて絶縁塗膜２上
に、厚さ約700μｍの導電塗膜（導電塗膜としてビニー
ル樹脂に35vol％のグラファィト粉末を添加した組成の
もの）３が施工されている。符号５は船体ブロック１の
木製架台を示している。また符号８は電源を示してお
り、電源８の一方の端子に被覆銅線６を介して銅箔４が
接続され、他方の端子に被覆銅線７を介して船体ブロッ
ク１が接続される。符号９は赤外放射温度計を示してい
る。Further, on the insulating coating film 2 including the copper foil 4, a conductive coating film 3 having a thickness of about 700 μm (composition obtained by adding 35 vol% of graphite powder to vinyl resin as the conductive coating film) 3 is applied. Have been. Reference numeral 5 denotes a wooden gantry of the hull block 1. Reference numeral 8 denotes a power supply. One terminal of the power supply 8 is connected to the copper foil 4 via the coated copper wire 6, and the other terminal is connected to the hull block 1 via the coated copper wire 7. Reference numeral 9 indicates an infrared radiation thermometer.
【０００９】上述の構成において、電源８の両端子を銅
箔４および船体ブロック１に接続し、導電塗膜３と船体
ブロック１との間に電圧を負荷する。このとき、絶縁塗
膜２にピンホール等の欠陥部がない場合には、導電塗膜
３と船体ブロック１との間に短絡はなく、したがって電
流は流れない。しかし絶縁塗膜２にピンホール等の施工
上の欠陥部（ピンホール）がある場合には、導電塗膜３
と船体ブロック１との間に短絡部が発生し、この短絡部
を介して短絡電流が流れ、その部分にジュール熱による
発熱を生じる。そして、この発熱を検出することにより
絶縁塗膜の欠陥部の検出を行なうことができる。In the above configuration, both terminals of the power supply 8 are connected to the copper foil 4 and the hull block 1, and a voltage is applied between the conductive coating 3 and the hull block 1. At this time, if there is no defective portion such as a pinhole in the insulating coating film 2, there is no short circuit between the conductive coating film 3 and the hull block 1, and therefore no current flows. However, if there is a defective part (pinhole) such as a pinhole in the insulating coating 2, the conductive coating 3
A short-circuit portion occurs between the hull block 1 and the hull block 1, a short-circuit current flows through the short-circuit portion, and heat is generated in that portion by Joule heat. Then, by detecting this heat generation, a defective portion of the insulating coating film can be detected.
【００１０】次に、実験例を示す。すなわち、絶縁塗膜
に欠陥部を設けるため、鋭利なナイフの刃先を利用して
絶縁塗膜２まで数μｍの傷を数カ所つけた後、その上に
導電塗料３を塗布して導電塗膜３と船体ブロック１との
間に意図的に短絡部を形成し、その３日後に導電塗料３
と船体ブロック１との間の電気抵抗を計測した。計測の
結果は25Ωであった。Next, an experimental example will be described. That is, in order to provide a defect in the insulating coating, a few μm scratches are made to the insulating coating 2 using a sharp knife edge, and then the conductive coating 3 is applied thereon. A short circuit is intentionally formed between the hull block 1 and the conductive paint 3
The electric resistance between the hull block 1 and the hull block 1 was measured. The result of the measurement was 25Ω.
【００１１】そこで、電源８の両端子を銅箔４および船
体ブロック１に接続し、両者間に約５ボルトの電圧を負
荷していくと、両者間に電流が流れ、欠陥部（短絡部）
が発熱し、周囲との温度差および色彩の変化を、赤外放
射温度計９を介して赤外線画像解析装置（図示せず）に
より計測，記録することができた。このようにして、短
絡部の発熱を赤外放射温度計９により検出できるので、
赤外放射温度計９を導電塗膜３の全表面に沿って移動さ
せることにより、絶縁塗膜の欠陥部の検出を、その全面
にわたって導電塗膜の施工後に手軽に行なうことが可能
となる。Then, when both terminals of the power supply 8 are connected to the copper foil 4 and the hull block 1 and a voltage of about 5 volts is applied between them, a current flows between them and a defective portion (short-circuit portion)
Generated heat, and a temperature difference from the surroundings and a change in color could be measured and recorded by an infrared image analyzer (not shown) via the infrared radiation thermometer 9. In this manner, the heat generated at the short-circuit portion can be detected by the infrared radiation thermometer 9,
By moving the infrared radiation thermometer 9 along the entire surface of the conductive coating film 3, it is possible to easily detect a defective portion of the insulating coating film after applying the conductive coating film over the entire surface.
【００１２】１例として、従来約半日を必要とした10ｍ
四方の塗膜面の検査を、本発明によれば５〜10分で行な
うことができる。また、この検査を導電塗膜の施工後に
行なうことができるため、導電塗膜式防汚システムの信
頼性の向上にもつながるという利点がある。[0012] As an example, 10m which conventionally required about half a day
Inspection of the four sides of the coating can be carried out according to the invention in 5 to 10 minutes. In addition, since this inspection can be performed after the application of the conductive coating, there is an advantage that the reliability of the conductive coating type antifouling system is improved.
【００１３】[0013]
【発明の効果】以上詳述したように、本発明の塗膜欠陥
検出法によれば、次のような効果ないし利点がある。 (1) 導電塗膜施工後、欠陥部の検出法が確立されたこと
により、絶縁塗膜施工後のピンホール検出時間を従来よ
り大幅に短縮することができた。 (2) 施工後に欠陥部検出が可能となり、本システム施工
技術の信頼性を向上させることができる。As described in detail above, the coating film defect detection method of the present invention has the following effects and advantages. (1) After the conductive coating was applied, the detection method of the defective part was established, so that the pinhole detection time after the insulating coating was applied could be shortened significantly compared to the conventional method. (2) Defects can be detected after construction, and the reliability of this system construction technology can be improved.
【図１】本発明の一実施例としての塗膜欠陥検出法を鋼
板製の船体ブロックに実施した場合を示す模式側断面
図。FIG. 1 is a schematic side sectional view showing a case where a coating film defect detection method as one embodiment of the present invention is applied to a hull block made of a steel plate.
１ 船体ブロック ２ 絶縁塗膜 ３ 導電塗膜 ４ 通電用の銅箔 ５ 木製架台 ６，７ 被覆銅線 ８ 電源 ９ 赤外放射温度計 DESCRIPTION OF SYMBOLS 1 Hull block 2 Insulation coating film 3 Conductive coating film 4 Copper foil for electricity supply 5 Wooden frame 6,7 Coated copper wire 8 Power supply 9 Infrared radiation thermometer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宇佐美 正博 長崎市深堀町５丁目717番１号 三菱重 工業株式会社 長崎研究所内 (56)参考文献 特開 平５−178284（ＪＰ，Ａ) 特開 平４−100794（ＪＰ，Ａ) 特開 平３−235793（ＪＰ，Ａ) 特開 昭61−247032（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B63B 59/04 G01M 19/00 B05D 3/00 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masahiro Usami 5-717-1 Fukahoricho, Nagasaki-shi Mitsubishi Heavy Industries, Ltd. Nagasaki Research Laboratory (56) References JP-A-5-178284 (JP, A) JP-A-4-100794 (JP, A) JP-A-3-235793 (JP, A) JP-A-61-247032 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B63B 59 / 04 G01M 19/00 B05D 3/00
Claims (1)
の接触部に絶縁塗膜を介して施工された導電塗膜をそな
えた海洋生物付着防止装置において、上記絶縁塗膜の施
工不良部の検出を上記導電塗膜の施工後に行なうに際
し、同導電塗膜と上記外板との間に電圧を負荷して上記
施工不良部に短絡電流による発熱を生じさせ、同発熱に
より発生する赤外線量を測定して上記絶縁塗膜の施工不
良部の検出を行なうようにしたことを特徴とする、塗膜
欠陥検出法。An apparatus for preventing marine organisms from adhering to a marine structure, comprising a conductive coating applied to a contact portion of a metal outer plate with seawater in an marine structure via an insulating coating. When performing the detection after the application of the conductive coating, a voltage is applied between the conductive coating and the outer plate to generate heat due to a short-circuit current in the poorly-formed portion, and the amount of infrared rays generated by the heat generation A method for detecting a coating film defect, wherein a defective portion of the insulating coating film is detected by measuring the insulated coating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21089093A JP3181153B2 (en) | 1993-08-03 | 1993-08-03 | Coating defect detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21089093A JP3181153B2 (en) | 1993-08-03 | 1993-08-03 | Coating defect detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0747995A JPH0747995A (en) | 1995-02-21 |
| JP3181153B2 true JP3181153B2 (en) | 2001-07-03 |
Family
ID=16596788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21089093A Expired - Fee Related JP3181153B2 (en) | 1993-08-03 | 1993-08-03 | Coating defect detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3181153B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5179243B2 (en) * | 2008-04-25 | 2013-04-10 | 日置電機株式会社 | Short position detector |
-
1993
- 1993-08-03 JP JP21089093A patent/JP3181153B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0747995A (en) | 1995-02-21 |
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