铝合金表面锡盐转化膜的制备及其耐蚀性  

Preparation and Corrosion Resistance of Tin Salt Conversion Film on Aluminum Alloy Surface

作　　者：吴艳波[1] 曾丝丝[1] 邹恩义[1] 孙鹏[1] 

机构地区：[1]大连交通大学环境与化学工程学院,大连116028

出　　处：《腐蚀与防护》2010年第9期685-687,共3页Corrosion & Protection

基　　金：辽宁省教育厅科学技术研究资助项目(2009A135)

摘　　要：以硫酸亚锡为主盐,通过化学转化法在铝合金表面形成耐蚀性良好的无铬化学转化膜。考察了锡盐浓度、成膜氧化剂浓度、成膜促进剂的质量浓度、反应温度及反应时间对膜层耐蚀性的影响,并对转化膜的耐蚀性能进行了电化学测试。在pH值为2～3时,确定了无铬化学转化液膜的最佳制备条件:SnSO40.15 g/L、KMnO41.5 g/L、NaF 2 g/L,反应温度30℃,反应时间1.5 min;该转化膜制备工艺简便、成膜速度快,膜的耐蚀性能好。A chrome-free chemical conversion film with good corrosion resistance was prepared by chemical conversion method using stannous sulfate as main salt. Effects of stannous sulfate concentration, film-forming oxidant concentration, film-forming accelerator concentration, reaction temperature and reaction time on corrosion resistance of the coating were studied. Corrosion resistance of the conversion coating was examined by electrochemical testing. At pH 2～3, the optimal preparation technologic conditions of chrome-free chemical conversion film were SnSO4 0. 15 g/L, KMnO4 1.5 g/L and NaF 2 g/L, reaction temperature 30℃, reaction time 1.5 min. The tin salt conversion film has simple preparation technology, rapid film-forming speed and good corrosion resistance.

关 键 词：铝合金 硫酸亚锡 无铬 化学转化 

分 类 号：TG174.45[金属学及工艺—金属表面处理]