摘要
采用稀土铈盐在镁合金表面生成了化学转化膜,通过扫描电镜、能谱分析等手段研究了采用植酸对镁合金表面及其表面化学转化膜进行后处理的改性作用,讨论了植酸浸泡溶液与工艺参数对吸附膜增重的影响。研究表明,镁合金表面植酸浸泡吸附膜以及化学转化膜植酸浸泡处理后膜层的增重随植酸浓度的增加、温度的升高及时间的延长而增大,所得化学转化膜经植酸浸泡处理可改善膜层表面龟裂,提高镁合金及其表面转化膜的耐蚀性,代替对环境污染严重的铬酸盐处理技术;并对镁合金表面膜的微观形貌与元素组成进行了表征。
Aqueous solution of cerium salt was used to prepare chemical conversion film on the surface of magnesium alloy. The morphology and elemental composition of the chemical conversion film were analyzed, while the effect of post-treatment by plant acid on the corrosion resistance of the chemical conversion film was investigated by means of dropping test with 5% Pb(AC) _2 . It was found that the corrosion resistance of the chemical conversion film on the Mg alloy could be improved by immersion in the plant acid. It was supposed that the post-treatment by plant acid could be adopted as a kind of environmentally friendly process to replace conventional toxic hexavalent chromium process for the corrosion prevention of Mg alloy.
出处
《材料保护》
CAS
CSCD
北大核心
2006年第11期24-26,共3页
Materials Protection
关键词
镁合金
化学转化膜
植酸
无铬
表面改性
耐蚀性
magnesium alloy
chemical conversion film
plant acid
Cr-free
surface modification
corrosion resistance
