测试了环氧树脂/钢体系在3.5%NaCl溶液中的电化学阻抗谱,并结合激光拉曼光谱测量和扫描电镜观察,系统地研究了有机涂层/金属体系性能与失效过程.重点在于涂层内部腐蚀性介质的传输以及涂层/金属界面发生的变化.结果表明:浸泡初期阻抗减小,中期阻抗增大,后期阻抗又减小,这与界面处生成的腐蚀产物膜有关.随着涂层在电解质溶液中浸泡时间的延长,涂层中Cl-浓度增加,破坏了界面处的腐蚀产物膜.
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