Abstract Cathodic delamination—weakening or loss of adhesion between the coating and the metal—is one of the major failure processes of organic coatings. Generally, it is almost inevitable to introduce defects to the coating during processing and operation. In this work, the delamination process of coatings around defects and the corrosion in defective coated metals was elucidated using immersion and electrochemical impedance tests. Two types of coatings (styrene-acrylic coating and terpolymer coating) were compared. The effects of defect size, chloride ion concentration and resin type on cathodic delamination were investigated. A small defect may affect the metal corrosion. Increasing the chloride ion concentration can promote the corrosion of metal but may not accelerate the delamination of the coating. The resin type is the key factor in the failure process of the coating.

中文翻译：

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电化学阻抗谱评估水性涂料/金属界面失效过程的更好理解

摘要 阴极分层——涂层与金属之间的附着力减弱或丧失——是有机涂层的主要失效过程之一。通常，在加工和操作过程中几乎不可避免地会引入涂层缺陷。在这项工作中，使用浸泡和电化学阻抗测试阐明了缺陷周围涂层的分层过程和缺陷涂层金属的腐蚀。比较了两种类型的涂料（苯乙烯-丙烯酸涂料和三元共聚物涂料）。研究了缺陷尺寸、氯离子浓度和树脂类型对阴极分层的影响。一个小的缺陷可能会影响金属的腐蚀。增加氯离子浓度可以促进金属的腐蚀，但不会加速涂层的分层。