采用电化学阻抗谱(EIS)和傅里叶变换红外光谱(FTIR)等方法研究了干湿交替环境和全浸环境试验条件下,环氧厚涂底漆在3.5％ NaCl溶液中的劣化过程和机制.在干湿交替和全浸两种条件下,涂层的劣化主要是由于涂层中环氧基团在电解质溶液中的水解.涂层中孔洞等缺陷及环氧基团水解生成的亲水性-OH,-NH2等基团,促进了电解液的渗透,加速了涂层的劣化进程.在干湿交替环境中,涂层劣化明显快于全浸环境.这是由于干湿交替环境中,涂层水解程度较全浸环境中更高,且干燥过程中氧的补充加速了阴极区的反应,促进了金属基体的腐蚀,使得涂层附着力变差.另外,在干湿交替循环作用下,由于涂层与基体涨缩不一致引起的内应力也加速了涂层的劣化过程.
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