不同镀锌层的三价铬钝化膜耐蚀性能比较  

Corrosion resistance comparison of trivalent chromium passivation film on zinc based on different zinc plating processes

作　　者：曾振欧[1] 邹锦光[1] 赵国鹏 刘建平 

机构地区：[1]华南理工大学化学科学学院,广东广州510640 [2]广州二轻工业科学技术研究所,广东广州510663

出　　处：《电镀与涂饰》2007年第1期7-9,共3页Electroplating & Finishing

摘　　要：采用中性盐雾实验NSS、Tafel曲线研究了酸性氯化钾镀锌层、碱性锌酸盐镀锌层和碱性氰化物镀锌层采用三价铬溶液进行钝化处理所得钝化膜的耐腐蚀能力和电化学行为。盐雾实验结果表明:碱性氰化物镀锌层采用三价铬溶液进行钝化处理所得钝化膜的耐蚀性能最好,碱性锌酸盐镀锌层次之,酸性氯化钾镀锌层最差;5%NaCl及3%NaOH溶液中的Tafel曲线显示:碱性氰化物镀锌层采用三价铬溶液进行钝化处理所得钝化膜的腐蚀速率最小,碱性锌酸盐镀锌层次之,酸性氯化钾镀锌层最大。The corrosion resistance and electrochemical behavior of trivalent chromium passivation films based on acidic potassium chloride zinc plating, alkaline zincate zinc plating and alkaline cyanide zinc plating deposit were studied respectively by neutral salt spray test （NSS） and Tafel curves. NSS test results show that the alkaline cyanide zinc plating deposit after trivalent chromium passivation treatment possesses the best corrosion resistance, followed by alkaline zincate zinc plating and acid potassium chloride zinc plating deposits. Tafel curves obtained in 5% NaC1 and 3% NaOH solutions respectively indicate that the alkaline cyanide zinc plating deposit after trivalent chromium passivation treatment has the lowest corrosion rate, followed by that of alkaline zincate zinc and acid potassium chloride zinc in an increasing order.

关 键 词：镀锌 三价铬 钝化 耐蚀性能 电化学行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TQ153.1[金属学及工艺—金属学]