6063铝合金表面Ce-Mn/Mo复合转化膜的组织及性能  

Microstructure and Corrosion Resistance of Cerium-Manga-nese/Molybdenum Composite Chemical Conversion Coating on Aluminum Alloy

作　　者：姚泽江[1] 武卫社 杜军[1] 凡婷[1] 穆松林[1] 李文芳[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640 [2]华昌铝厂有限公司,广东佛山528231

出　　处：《材料保护》2014年第10期23-26,7,共4页Materials Protection

基　　金：粤港关键领域重点突破(佛山专项)专项基金(2008Z012);广东省重大科技专项(产业共性技术)基金(2009A08025002)资助

摘　　要：为了进一步提高铝合金的耐腐蚀性能,利用两步法在6063铝合金表面制备Ce-Mn/Mo复合化学转化膜。采用扫描电镜、能谱仪、电化学测试对转化膜的组织结构和耐蚀性能进行表征。结果表明:Ce-Mn/Mo复合膜主要由Al,Mo,Ce,Mn的氧化物和氢氧化物组成,主要成膜元素Mo,Ce和Mn在膜层中分布规律基本一致;膜层组织致密且较厚,与基体间结合良好;Ce-Mn/Mo复合转化膜具有优异的电化学腐蚀性能,可显著降低6063铝合金的自腐蚀电流密度,使钝化区间变宽。Ce-Mn/Mocomposite chemical conversion coating was prepared on 6063 alumi-num alloy substrate by a two-step route, and its microstructure, elemental composition and corrosion resistance were analyzed. Results showed that the Ce-Mn/Mo composite conversion coating mainly consisted of the oxides and hydroxides of Al, Mo, Ce and Mn elements, and the major film-forming e.lements Mo.,Ce and Mn had. similar distributions in the composite conversion coating. Besides, the Ce-Mn/Mo composite conversion coating was relative-ly thick and exhibited dense structure as well as good adhesion to the substrate. Furthermore, the Ce-Mn/Mo composite conversion coating exhibited excellent corrosion resistance and could signifi-cantly reduce the corrosion potential and broaden the passivation range of the Al alloy substrate.

关 键 词：6063铝合金 Ce-Mn/Mo复合转化膜 组织结构 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]