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应用阵列电极(WBE)和电化学阻抗谱(EIS)技术,研究了破损涂层在3.5%(质量分数)Na Cl溶液中的电流分布及阻抗谱,并根据电流分布和涂层阻抗变化探究了破损涂层在水线区的剥离机制。结果表明:人为破损和涂层固有缺陷均对其附近涂层有加速阴极剥离的作用。浸泡初期,缺陷处涂层最先剥离,此后,涂层剥离主要在破损处和缺陷处附近优先发展。并且在水线作用下,缺陷处附近的涂层剥离向水线方向发展。水线上涂层较水线下剥离较晚,其剥离速率主要受水在涂层中的渗透速率控制。
The current distribution and impedance spectrum of the damaged coating in NaCl solution 3.5% (mass fraction) were studied by using the array electrode (WBE) and electrochemical impedance spectroscopy (EIS). The current distribution and the impedance change of the coating were investigated Peeling mechanism of damaged coating in waterline area. The results show that both man-made damage and inherent defects of the coating accelerate the cathodic disbondment of the coating nearby. In the initial stage of immersion, the coating at the defect first peeled off, and thereafter the coating was peeled off mainly in the vicinity of the damaged part and the defect, giving priority to development. And in the waterline, the defects in the vicinity of the coating stripping to the waterline direction. The coating on the waterline is released later than the waterline, and the peel rate is mainly controlled by the infiltration rate of the water in the coating.