摘要
利用极化曲线方法,研究了以La(NO3)3.6H2O为促进剂的磷酸盐转化膜的耐蚀性,同时与铬磷化膜及无稀土促进的单纯磷酸盐膜的耐蚀性进行了对比;通过划格法和全浸腐蚀试验,研究了这三种转化膜与有机涂层间的结合力。结果发现:与单纯磷酸盐膜相比,稀土促进生成的磷酸盐膜中的传输阻力增加,耐蚀性明显增强,而与铬磷化膜相比,二者在弱极化区的耐蚀性能相近;稀土促进生成的磷酸盐膜与有涂层间的结合力明显优于铬磷化膜。
The anti-corrosion of the conversion coming which is formed by LaLa（NO3）3·6H2O was evaluated with polar-ization curve, and also compared the chromium phosphate fihn and non-rare phosphate conversion coating. Adhesion force be-tween the conversion coatings and the organic coating were studied through crossing grid method and immersing corrosion test. The results showed that the transmission resistance of conversion coating with rare earth additive was increased by comparing with non-rare phosphate conversion coating; The anti-corrosion of the conversion coating was increased noticeably. But compa- ring with chromium phosphting, in the weak polarized scope, both of the corrosion resistances were close. Adhesion force be- tween the conversion coating with rare earth as additive and the organic coating was obviously superior to that of chromate phos- phate process.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2013年第3期42-45,55,共5页
Surface Technology
基金
河南省科技攻关重点项目(122102310321)
关键词
铝合金
转化膜
无铬
稀土
耐蚀性
结合力
aluminum alloy
conversion coating
chrome-free
rare earth
corrosion resistance
adhension
