铸铝件表面几种环保转化膜的耐蚀性  

Corrosion resistance of several kinds of environment-friendly conversion films on aluminum castings

作　　者：李海丰 张文泉 LI Hai-feng;ZHANG;Wen-quan(College of Materials Science and Engineering,Hubei Automotive Industry Institute,Shiyan 442002,China)

机构地区：[1]湖北汽车工业学院材料科学与工程学院

出　　处：《电镀与涂饰》2019年第21期1182-1185,共4页Electroplating & Finishing

摘　　要：对比了铸铝基体上环保型Mo盐、Co盐、Zr盐、Zr-Ti盐转化膜的外观、表面形貌和相结构,并通过硫酸铜点滴腐蚀试验和盐水浸泡试验对比了它们的耐蚀性.结果表明:4种转化膜都完整、连续,但微观上不够致密,适用于涂装打底.Co盐转化膜的耐蚀性最好,Ti-Zr盐和Zr盐转化膜次之,Mo盐转化膜最差.The appearance,surface morphologies,and phase constitutions of the conversion films formed on aluminum castings from environment-friendly baths based on molybdate,cobalt salt,fluorozirconate,and Zr-Ti salt respectively were compared.Their corrosion resistance were examined by copper sulfate dropping corrosion test and saline immersion test.The results showed that all of the conversion films were integrated,but not compact enough in microstructure,being suitable to be used as a base for painting.The corrosion resistance of Co salt conversion film was the best,followed by the Zr-Ti salt and fluorozirconate conversion films,and the molybdate conversion film had the worst corrosion resistance.

关 键 词：铸铝 化学转化 钼酸盐 钴盐 氟钛酸盐 氟锆酸盐 微观结构 耐蚀性 

分 类 号：TQ153.6[化学工程—电化学工业]