摘要
用电化学阻抗谱(EIS)、附着力测试、Fourier红外光谱(FT-IR)和扫描电镜(SEM)等分析手段研究了环氧防腐涂层在干湿交替及全浸泡环境下的失效过程。结果表明,干湿交替环境中环氧防腐涂层前期的防护效果较好,涂层后期失效快于全浸泡环境下的失效速率;环氧防腐涂层在干湿交替环境下失效的原因是由于涂层交替的吸水和失水过程使得涂层孔隙率增大,对涂层造成机械损坏,使得涂层内部及表面开裂,最终导致附着力降低,涂层大面积起泡失效。
The failure process of the epoxy coating subjected to test of alternating immersion in artificial seawater and dry in air was studied by means of electrochemical impedance technique(EIS), Fourier transform infrared spectrometry(FT-IR), scanning electronic microscope(SEM), adhesion test and water absorption measurement. The results showed that, in the earlier test period, the epoxy coating subjected to wed-dry cycle test presents higher protectiveness than that subjected to merely immersion test. At the last test period, the former coating failed faster than the later one. The failure mechanism of the epoxy coating during wet-dry cycle testing may be proposed as that the coating matrix underwent alternate absorption and loss of water during the test, correspondingly, the relevant swelling and shrinking may generate more porosity within the coating, as a result, mechanical damages, such as cracks may develop from the interior to the surface of the coating, leads to lower adhesion and blisters of the coating eventually.
作者
王贵容
郑宏鹏
蔡华洋
邵亚薇
王艳秋
孟国哲
刘斌
WANG Guirong;ZHENG Hongpeng;CAI Huayang;SHAO Yawei;WANG Yanqiu;MENG Guozhe;LIU Bin(College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;Aviation Industry Chengdu Aircraft Industry(Group)Co.,Ltd.,Chengdu 610092,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2019年第6期571-580,共10页
Journal of Chinese Society For Corrosion and Protection
基金
国家重点研发计划(2016YFB0300604)。
关键词
环氧防腐涂层
干湿交替
涂层孔隙
鼓泡失效
epoxy coating
dry-wet cycle
porosity of the coating
blisters failure
