JPS5950933B2 - Defect inspection method for insulating resin coating - Google Patents
Defect inspection method for insulating resin coatingInfo
- Publication number
- JPS5950933B2 JPS5950933B2 JP10153978A JP10153978A JPS5950933B2 JP S5950933 B2 JPS5950933 B2 JP S5950933B2 JP 10153978 A JP10153978 A JP 10153978A JP 10153978 A JP10153978 A JP 10153978A JP S5950933 B2 JPS5950933 B2 JP S5950933B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid storage
- coating
- storage structure
- insulating resin
- resin coating
- 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
Links
- 239000011248 coating agent Substances 0.000 title claims description 15
- 238000000576 coating method Methods 0.000 title claims description 15
- 230000007547 defect Effects 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 9
- 238000007689 inspection Methods 0.000 title description 7
- 239000011347 resin Substances 0.000 title description 6
- 229920005989 resin Polymers 0.000 title description 6
- 239000007788 liquid Substances 0.000 claims description 13
- 230000002950 deficient Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000002585 base Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Description
【発明の詳細な説明】
本発明は熱交換器の水室や管などの貯液構造の内面に施
した絶縁性樹脂コーティングの欠陥を検査及び補修する
方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inspecting and repairing defects in an insulating resin coating applied to the inner surface of a liquid storage structure such as a water chamber or pipe of a heat exchanger.
海水等の腐食性のある流体を利用する熱交換器において
は、寿命を向上させるため、最近、水室や管などの内面
に絶縁性樹脂をコーティングして腐食性を向上させるこ
とが行なわれている。In order to extend the lifespan of heat exchangers that use corrosive fluids such as seawater, recent efforts have been made to coat the inner surfaces of water chambers and pipes with insulating resin to improve corrosivity. There is.
ところが、このコーティングを完全に行うことは困難で
あり、ピンポールなどのコーティング欠陥が存在してい
ることが多い。このため、検査によりこの欠陥量を測定
し、場合によつては欠陥部を確認して補修する必要があ
る。本発明方法は上述のような検査を行なうと共に検査
後におけるコーティング欠陥部の耐食性を向上させるこ
とを目的として提案するものである。However, it is difficult to completely perform this coating, and coating defects such as pinholes often exist. Therefore, it is necessary to measure the amount of defects through inspection and, if necessary, to confirm and repair the defective portion. The method of the present invention is proposed for the purpose of performing the above-mentioned inspection and improving the corrosion resistance of coating defects after the inspection.
すなわち、管やタンク等に代表される貯液構造の金属製
母材よりも電気化学的に卑な金属イオンを微量に添加し
た導電性溶液を、内部に絶縁性コーティングを施こした
貯液構造内に満たし、該溶液Ｊ中に陽極用の電極を設け
、貯液構造の母材を陰極として両極間に電圧を加え、コ
ーティング欠陥部に金属イオンを電着させながら漏洩電
流を測定してコーーテイングの欠陥部を補修及び検査す
ることを特徴とする貯液構造の欠陥検査・欠陥補修法を
ｊ要旨とする。以下、実施例により本発明を具体的に述
べる。In other words, it is a liquid storage structure in which a conductive solution containing a small amount of metal ions that are electrochemically more base than the metal base material of liquid storage structures such as pipes and tanks is coated with an insulating coating. An electrode for the anode is provided in the solution J, and a voltage is applied between the two electrodes using the base material of the liquid storage structure as the cathode, and the leakage current is measured while metal ions are electrodeposited on the defective part of the coating. The gist of this invention is a defect inspection/repair method for a liquid storage structure, which is characterized by repairing and inspecting defective parts of a liquid storage structure. The present invention will be specifically described below with reference to Examples.
貯液構造としての水室１及び管２内面に絶縁性樹脂コー
ティングを施した多管式熱交換器に対し本発明方法を実
施した時のシステム概略図を第１図フに示す。水室内に
水室本体とは絶縁した状態で電極板３を設けこれを陽極
とし、水室及び管本体を陰極として両極の間に直流電源
４と電流計５を設置した。FIG. 1F shows a system schematic diagram when the method of the present invention is applied to a multi-tubular heat exchanger having an insulating resin coating on the inner surfaces of the water chamber 1 and the tubes 2 as a liquid storage structure. An electrode plate 3 was provided in the water chamber insulated from the water chamber main body, and was used as an anode, and the water chamber and the tube main body were used as cathodes, and a DC power source 4 and an ammeter 5 were installed between the two electrodes.
タンク６内に導電性溶液７を満たし、これを丁循環ポン
プ８により水室及び管内に循環させた。導電性溶液は３
％の食塩水に塩化亜鉛を３％、塩化アルミニウムを０．
４％添加したものである。このような状態で直流電源を
２４Ｖにして３０型用通電したところ、電流計の値はｌ
ｍＡであつた。そのフ後、循環ポンプを停止し、回収ポ
ンプ９により水室及び管内の導電性溶液をタンク内に回
収した。以上の測定を終了した後、目視及び管内鏡で水
室や管内面の状態を観察したところ、絶縁性樹脂コーテ
ィングの欠陥部には亜鉛が粒状に電着し欠陥１部位置が
明確に把握できた。なお、この多管式熱交換器はその後
欠陥部の補修を行なわず運転を続けたが、従来のような
欠陥部から発生する腐食トラブルが発生せず、従来の多
管式熱交換器に比べ寿命が長い。これは欠陥部に電着し
た亜鉛による防食作用によるものと考えられる。ところ
で、絶縁性樹脂コーテイングを施こした多数の熱交換器
に対して本発明方法を実施して各種の検討を行なつた結
果、通電時間と電流値との関係から、第２図に斜線で示
すような熱交換器の解体補修工事必要範囲が得られた。
ただし、この場合の直流電源の電圧は７０Ｖである。さ
て、本発明方法は次のような特徴を有する。The tank 6 was filled with a conductive solution 7, which was circulated through the water chamber and pipes by a circulation pump 8. The conductive solution is 3
% salt solution with 3% zinc chloride and 0.0% aluminum chloride.
4% was added. In this situation, when I turned on the DC power supply to 24V and turned on the 30 type, the value on the ammeter was l.
It was mA. After that, the circulation pump was stopped, and the conductive solution in the water chamber and pipes was recovered into the tank by the recovery pump 9. After completing the above measurements, we observed the condition of the water chamber and the inner surface of the tube visually and with a tube endoscope, and found that zinc was electrodeposited in granular form on the defective part of the insulating resin coating, and the position of one defect could be clearly identified. Ta. Although this multi-tube heat exchanger continued to operate without repairing the defective parts, it did not suffer from the corrosion problems caused by the defective parts, and was superior to conventional multi-tube heat exchangers. Long lifespan. This is thought to be due to the anticorrosion effect of zinc electrodeposited on the defective areas. By the way, as a result of implementing the method of the present invention on a large number of heat exchangers coated with an insulating resin and conducting various studies, we found that the relationship between the energization time and the current value was indicated by diagonal lines in Figure 2. The required area for dismantling and repairing the heat exchanger was obtained as shown below.
However, the voltage of the DC power supply in this case is 70V. The method of the present invention has the following features.
ｉ 熱交換器等の貯液構造の絶縁コーテイング部全体を
一度に検査できるため、検査能率が高い１１検査するこ
とによりコーテイング欠陥部に金属製母材よりも電気代
学的に卑な金属イオンを電着して補修し、更に母材のガ
ルバニツクコロージヨンを防止してあるので、コーテイ
ング欠陥部の耐食性向上及び貯液構造の寿命延長が計れ
る。i The entire insulating coating part of a liquid storage structure such as a heat exchanger can be inspected at once, so inspection efficiency is high.11 Inspection allows coating defects to contain metal ions, which are more base in terms of electricity cost than metal base materials. Since it is repaired by electrodeposition and galvanic corrosion of the base material is prevented, the corrosion resistance of coating defects can be improved and the life of the liquid storage structure can be extended.
１１１電着した金属により、目視などによる欠陥部の発
見が容易である。Due to the 111 electrodeposited metal, defects can be easily found by visual inspection.
Ｉｖ漏洩電流と通電時間との関係から解体補修工事の要
否が判断できる。The necessity of dismantling and repair work can be determined from the relationship between the Iv leakage current and the energization time.
第１図は多管式熱交換器に対し本発明方法を実施した時
のシステム慨略図、第２図は熱交換器の解体補修工事必
要範囲を示す通電時間と電流との関係図である。
第１図において、１・・・・・・水室、２・・・・・・
管、３・・・・・・電極板、４・・・・・・直流電源、
５・・・・・・電流計、６・・・・・・タンク、７・・
・・・・導電性溶液、８・・・・・・循環ポンプ、９・
・・・・・回収ポンプ。FIG. 1 is a schematic diagram of a system when the method of the present invention is applied to a shell-and-tube heat exchanger, and FIG. 2 is a diagram showing the relationship between energization time and current, showing the range of disassembly and repair work required for the heat exchanger. In Figure 1, 1... water chamber, 2...
Tube, 3...electrode plate, 4...DC power supply,
5... Ammeter, 6... Tank, 7...
... Conductive solution, 8 ... Circulation pump, 9.
...Recovery pump.
Claims (1)
りも電気化学的に卑な金属イオンを微量に添加した導電
性溶液を、内部に絶縁性コーティングを施こした貯液構
造内に満たし、該溶液中に陽極用の電極を設け、貯液構
造の母材を陰極として両極間に電圧を加え、コーティン
グ欠陥部に金属イオンを電着させながら漏洩電流を測定
してコーティングの欠陥部を補修及び検査することを特
徴とする貯液構造の欠陥検査・欠陥補修法。1. A conductive solution containing a trace amount of metal ions that are electrochemically more base than the metal base material of a liquid storage structure, such as a pipe or tank, is placed inside a liquid storage structure with an insulating coating applied inside. An anode electrode is placed in the solution, and a voltage is applied between the two electrodes using the base material of the liquid storage structure as the cathode. The leakage current is measured while metal ions are electrodeposited on the defective part of the coating, and defects in the coating are detected. A method for inspecting and repairing defects in liquid storage structures, which is characterized by repairing and inspecting parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10153978A JPS5950933B2 (en) | 1978-08-21 | 1978-08-21 | Defect inspection method for insulating resin coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10153978A JPS5950933B2 (en) | 1978-08-21 | 1978-08-21 | Defect inspection method for insulating resin coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5527970A JPS5527970A (en) | 1980-02-28 |
| JPS5950933B2 true JPS5950933B2 (en) | 1984-12-11 |
Family
ID=14303232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10153978A Expired JPS5950933B2 (en) | 1978-08-21 | 1978-08-21 | Defect inspection method for insulating resin coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5950933B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5884214A (en) * | 1981-11-12 | 1983-05-20 | Duskin Franchise Co Ltd | Swivel control device |
| JPS5884215A (en) * | 1981-11-12 | 1983-05-20 | Duskin Franchise Co Ltd | Swivel control device |
-
1978
- 1978-08-21 JP JP10153978A patent/JPS5950933B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5527970A (en) | 1980-02-28 |
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