氯离子对环氧粉末涂层失效的影响  

Effect of Chloride Ion on Failure of Epoxy Powder Coating

作　　者：丁清苗[1,2] 李自力[1] 沈陶 崔艳雨[2] DING Qingmiao;LI Zili;SHEN Tao;CUI Yanyu(Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety,College of Pipeline and Civil Engineering,China University of Petroleum (East China),Qingdao 266555,China;College of Airport,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国石油大学(华东)储运与建筑学院,山东省油气储运安全重点实验室,青岛266555 [2]中国民航大学机场学院,天津300300

出　　处：《机械工程材料》2019年第7期48-53,共6页Materials For Mechanical Engineering

基　　金：机场工程研究基地开放基金资助项目

摘　　要：采用增重法和电化学方法研究了Q235钢表面环氧粉末涂层在不同含量NaCl溶液(溶液中NaCl质量分数为0,1.0%,3.5%,6.0%,8.5%)中的吸水量和耐腐蚀性能,分析了氯离子对涂层失效的影响。结果表明:随着溶液中氯离子含量的增加,环氧粉末涂层的饱和吸水量减少,达到饱和吸水的时间缩短;氯离子加速了环氧粉末涂层的失效,且溶液中氯离子含量越高,涂层失效越快,界面腐蚀越早发生,金属基体腐蚀越严重。Water absorption amount and corrosion resistance of epoxy powder coating on surface of Q235 steel in NaCl solution of different contents(mass fractions of NaCl in solution were 0,1.0%,3.5%,6.0%,8. 5%)were studied by weight gain method and electrochemical method.The effect of chloride ion on the failure of the coating was analyzed.The results show that with increasing content of chloride ion in the solution,the saturated water absorption amount decreased,and the time interval for reaching the saturated water abroption was shortened. The chloride ion accelerated the failure of the epoxy powder coating.Moreover,the higher the chloride ion content in the solution was,the faster the coating failed,the earlier the interface corrosion occurred,and the more severe the corrosion of the metal matrix was.

关 键 词：增重法 电化学方法 氯离子 环氧粉末涂层 涂层电阻 腐蚀电位 

分 类 号：TG174[金属学及工艺—金属表面处理]