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.
出处
《腐蚀与防护》
CAS
北大核心
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)
关键词
铝合金
硫酸亚锡
无铬
化学转化
aluminum alloy
stannous sulfate
chrome-free
chemical conversion
