摘要
研究了镁合金钼酸盐/磷酸盐复合转化膜,分析了影响复合转化膜性能的因素。结果表明:当钼酸盐/磷酸盐复合转化液pH值为5,n(MoO24-)/n(H2PO-4)为1/2时,镁合金钼酸盐/磷酸盐复合转化膜腐蚀电流最低,耐蚀性能较好,微观表面呈均匀"蜂窝"状,具有最佳防腐蚀性能;并且当Ca2+和Mn2+同时存在时,膜层的极化电阻最大。
A molybodate/phosphate conversion coating on magnesium alloy is investigated,and several factors affecting the conversion coating are analysed. The results show that molybdate/phosphate conversion coating has the lowest corrosion current and the best corrosion resistance when the pH of molybdate-phosphate conversion bath is 5 and n （ MoO4^2- ）/n （ H2PO4^- ） is 1/2. The treated magnesium alloy has a uniform alveolate-erystallized microstrueture. When the molybdate-phosphate conversion bath contains both ions Mn^2＋ and Ca^2＋,the conversion coating has maximal polarization impedance.
出处
《电镀与环保》
CAS
CSCD
2008年第1期23-26,共4页
Electroplating & Pollution Control
基金
湖南省自然科学基金资助项目(06B0073)
关键词
镁合金
钼酸盐/磷酸盐
转化膜
magnesium alloy
molybdate-phosphate
conversion coating
