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| Effects of Wet-Dry Alternating Frequency on Deterioration Processes of Organic Coatings |
| Received:November 26, 2018 Revised:May 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.05.015 |
| KeyWord:organic coatings wet-dry alternation 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 |
| WANG Qi |
4. Marine Biology Institute of Shandong Province, Qingdao , China |
| LIU Min |
5. State Grid Zhejiang Electric Power Research Institute, Hangzhou , China |
| CHEN Ling-yu |
5. State Grid Zhejiang Electric Power Research Institute, Hangzhou , China |
| ZHANG Wei |
1. NCS Testing Technology Co., Ltd, Qingdao , China |
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| Abstract: |
| Objective To study the effects of wet-dry alternating frequency on the deterioration processes of organic coatings. Methods Electrochemical impedance spectroscopy was used in combination with photos of coating and corrosion morphology, to comparatively study the organic coating failure process in the beginning, middle and later stages of immersion under the conditions of high-frequency and low-frequency alternation of wetting and drying. Results Under the condition of high-frequency alternation of wetting and drying, the durations of the coating in beginning, middle and later stages of immersion were 13 days, 2 days and 5 days respectively. While under the condition of low-frequency alternation of wetting and drying, the durations of the coating in beginning, middle and later stages of immersion were 18 days, 4 days and 46 days respectively. By contrast, the duration in later stage of immersion was significantly shortened and the coating failure process was accelerated. Besides, under the condition of high-frequency alternation of wetting and drying, the positions of coating blisters were evenly distributed and the base metal suffered from uniform corrosion, which was opposite to the condition of low-frequency alternation of wetting and drying. Conclusion Under the condition of high-frequency alternation of wetting and drying, the coating failure was faster, the coating blisters was more evenly distributed and the base metal had from uniform corrosion. |
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