摘要
为改善铝及铝合金的表面防腐蚀性能,在γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH-560)基础溶液中添加不同含量的硝酸镧,在6061铝合金表面制备不同硝酸镧浓度掺杂的硅烷-镧盐复合膜;采用极化曲线、硫酸铜点滴、腐蚀失重率试验等方法分析膜层性能,并得出了镧盐最佳用量。对比分析了最佳镧盐用量下复合膜、硅烷膜和稀土转化膜的耐蚀性能。结果表明:在KH-560硅烷膜制备过程中添加一定量硝酸镧可有效提高硅烷膜的耐蚀性,添加15 g/L硝酸镧时,形成的复合膜层致密且没有裂纹,耐蚀性最好;与单一的硅烷、镧盐转化膜相比,复合膜表现出很好的耐蚀性。
By adding different concentrations of lanthanum nitrate into γ- （2,3- epoxypropoxy） propyhrimethoxysilane （KH560） based solu- tion, the KH560/lanthanum salt composite films modified with different concentrations of lanthanum nitrate were prepared on 6061 aluminum alloy. The performances of film were analyzed by polarization curve measurement, dipping test of copper sulfate and test of corrosion weight-loss rate, and the optimal dosage of lanthanum nitrate was obtained. Moreover, the corrosion resistances of composite film, silane film and rare- earth conversion coating were compared and analyzed. Results showed that adding a certain dosage of lanthanum nitrate into the synthesis process of KH-560 silane film could effectively improve the corrosion resistance of silane film, and when the dosage of lanthanum nitrate was 15 g/L, the prepared composite film was dense and no crack existed on the surface, which presented the optimal corrosion resistance. Compared with the silane film and rare-earth conversion coating, the composite film showed better corrosion resistance.
出处
《材料保护》
CSCD
北大核心
2017年第10期16-19,共4页
Materials Protection
基金
河南省科技发展计划项目(1521023102122)
新乡学院科技创新基金(15ZC16)资助
关键词
6061铝合金
硅烷-镧盐复合膜
腐蚀失重
极化曲线
耐蚀性
6061 aluminum alloy
silane/lanthanum salt composite film
corrosion weight-loss rate
polarization curves
corrosion resistance
