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Debonding Mechanism of Organic Coating with Man-made Defect in the Area nearby Water-line by WBE Technique |
Yalin CHEN1,2,Wei ZHANG1,2,Kuiying DING3,Jia WANG4,5(),Pengfei YIN1,2,Caichang DONG1,2,Wanguo YANG1,2 |
1. Qingdao Institute of Marine Corrosion, Central Iron & Steel Research Institute, Qingdao 266071, China 2. NCS Testing Technology Co., Ltd., Qingdao 266071, China 3. Technical Center of Weifang Entry-Exit Inspection and Quarantine Bureau, Weifang 261041, China 4. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China 5.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract The debonding process of organic coatings with desired artificial defects in 3.5%NaCl solution was studied by means of wire beam electrode (WBE) method and electrochemical impedance spectroscopy (EIS) technique. The purpose was to reveal the relevant debonding mechanism of organic coatings in the area nearby water-line via analyzing the current distribution and the variation of impedance spectroscopy during the experiment. It was found that, either the artificial defect or inherent defect could accelerate cathodic debonding rate of the coating around the defects. Besides, due to the effect of waterline, a coating debonding, which initiated from one inherent defect will expand towards the waterline. The coating debonding occurred firstly on the area below the waterline, and then later above the waterline. The coating debonding rate on the area above waterline was controlled by the permeation rate of electrolyte through the coating.
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