聚酯粉末涂层在模拟海洋环境中的腐蚀行为  

Corrosion Behavior of Polyester Powder Coating in Simulated Sea Environment

作　　者：周和荣 揭敢新 马坚 

机构地区：[1]中国电器科学研究院有限公司,广州510300

出　　处：《材料工程》2013年第9期48-53,59,共7页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50971048);科技部火炬计划(2011GH031716)

摘　　要：采用金相显微镜和交流阻抗谱研究了涂层缺陷以及不同前处理工艺对建筑铝合金6063在0.6mol/L NaCl溶液(pH=7.0)中的腐蚀行为。结果表明:未经铬酸钝化处理的铝合金缺陷粉末涂层在0.6mol/L NaCl溶液(pH=7.0)中浸泡50d后,其划痕处堆满腐蚀产物,涂层色差变化较大,划痕两侧无明显腐蚀,其腐蚀速率比浸泡相同时间的经铬酸钝化处理的铝合金粉末涂层约高5倍,铝合金钝化膜能延缓腐蚀,提高缺陷涂层和完整涂层的阻抗。The corrosion behavior of 6063 aluminum alloy with powder coating in 0. 6mol/L NaC1 （pH= 7. 0） solution was investigated by metallographic microscope and electrochemical impedance spectroscopy （EIS）. The results show that artificial defect is covered with corrosion products after the sample of powder coating without chromic acid passivation immersed into 0.6mol/L NaCI（pH= 7.0） solution for 50 days. Chromatic aberration value of powder coating increases. Corrosion behavior does not occur at the border of artificial defect of the sample. Corrosion rate of 6063 aluminum alloy with- out chromic acid passivation is about five times higher than that for the sample with chromic acid pas- sivation by EIS test. Aluminum passivation film can delay the corrosion of aluminum alloy and im- prove the impedance of defect and perfect coating.

关 键 词：粉末涂层 铬酸钝化 海洋环境 交流阻抗 

分 类 号：TG172.3[金属学及工艺—金属表面处理]