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| Deterioration Processes of Organic Coatings under the Low-frequency Alternation of Wetting and Drying Condition |
| Received:July 16, 2018 Revised:January 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.01.024 |
| KeyWord:organic coatings wet-dry cycles EIS degradation |
| Author | Institution |
| CHEN Ya-lin |
1. NCS Testing Technology Co., Ltd, Qingdao , China |
| ZHANG Cong |
2. Zhejiang Guohua Zheneng Power Generation Co., Ltd, Ninghai , China |
| LI Yan-wei |
3. Hangzhou Yineng Electric Power Technology Co., Ltd, Hangzhou , China |
| LIU Min |
4. State Grid Zhejiang Electric Power Research Institute, Hangzhou , China |
| CHEN Ling-yu |
4. State Grid Zhejiang Electric Power Research Institute, Hangzhou , China |
| WANG Qi |
5. Marine Biology Institute of Shandong Province, Qingdao , China |
| YANG Zhao-hui |
1. NCS Testing Technology Co., Ltd, Qingdao , China |
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| Abstract: |
| Objective To study on the deterioration processes of organic coatings under the low-frequency alternation of wetting and drying condition. Methods Electrochemical impedance spectroscopy, combining with photos of coating and corrosion morphology was employed to comparatively study the organic coating failure process in the beginning, middle and late of immersion under full immersion and low-frequency alternation of wetting and drying condition. Results Under low-frequency alternation of wetting and drying condition, the durations of the coating in beginning, middle and late of immersion time were 18 days, 4 days and 46 days respectively. Compared with the coating in full immersion environment, the duration in the middle of immersion time was significantly shortened and the duration in the late of immersion time was significantly extended. The coating suffered from obviously local peeling and the base metal suffered from obviously local corrosion. Conclusion The deterioration processes of organic coating is decelerated under cyclic wet-dry condition and the underlying metal in this environment suffers from apparent local corrosion. |
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