热浸镀锌层表面偏钒酸盐转化膜  

Metavanadate conversion coating on the surface of hot-dip galvanized coating

作　　者：许乔瑜[1] 左茜[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《电镀与涂饰》2011年第1期34-36,共3页Electroplating & Finishing

摘　　要：在热浸镀锌试样表面获得了一层均匀、完整的偏钒酸盐转化膜。成膜溶液成分及工艺条件为:NaVO35g/L,pH1.3,温度30°C,时间30min。对比研究了偏钒酸盐转化膜和铬酸盐转化膜的耐蚀性能。结果表明,偏钒酸盐转化膜由Zn、O、V等元素组成,热浸镀锌层经偏钒酸盐转化处理后电化学阻抗和极化电阻增大,腐蚀电流密度减小,耐蚀性明显提高且超过了铬酸盐转化膜。A uniform and complete metavanadate conversion coating was obtained on the surface of hot-dip galvanized coating. The bath composition and conditions are as follows： NaVO3 5 g/L, pH 1.3, temperature 30 ℃ and time 30 min. The corrosion resistance of metavanadate conversion coating and chromate conversion coating was compared. The results showed that the metavanadate conversion coating is mainly composed ofZn, 0 and V elements. The polarization resistance and electrochemical impedance values of hot-dip galvanized coating are increased while decreased after treating with corrosion current density is metavanadate. The corrosion resistance of metavanadate conversion coating is greatly improved and exceeds that of chromate conversion coating.

关 键 词：热浸镀锌层 偏钒酸盐 转化膜 耐蚀性能 

分 类 号：TQ153.15[化学工程—电化学工业] TG178[金属学及工艺—金属表面处理]