6063铝合金表面Ce-Mn/Mo复合转化膜的制备及性能  

Study on Preparation and Properties of Ce-Mn / Mo Composite Conversion Coating on 6063 Aluminum Alloy

作　　者：关玉芹 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,广州510640 [2]华昌铝厂有限公司,广东佛山528231

出　　处：《表面技术》2014年第6期79-83,共5页Surface Technology

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)~~

摘　　要：目的进一步改善6063铝合金表面Ce-Mn转化膜的综合性能。方法采用以Ce(NO3)3和KMn O4为主盐的转化液,在6063铝合金表面制备出Ce-Mn转化膜,再利用钼酸钠溶液进行后处理,优化处理工艺,获得Ce-Mn/Mo复合转化膜。对后处理前后的转化膜形貌、成分及电化学性能进行对比,并通过空气中放置、磨损测试的方法对比它们的耐候性和耐磨性。结果较优的成膜工艺为:18 g/L Na2Mo O4,1.5 g/L十二烷基苯磺酸钠,成膜时间18 min,成膜温度45℃。经后处理后,膜层颜色由金黄色转变为棕黑色,组织致密,主要由Ce,Mn,Mo,O和Al等元素组成,厚度提高至约7μm,腐蚀电流密度降低了约85%。结论与Ce-Mn膜层相比,Ce-Mn/Mo复合转化膜具有更优异的耐蚀性、耐候性和耐磨性。Objective To improve the comprehensive properties of the Ce-Mn conversion coating deposited on 6063 aluminum alloy. Methods The Ce-Mn conversion coating was firstly prepared in the solution mainly containing cerium nitrate and potassium permanganate. After that, the Ce-Mn coating was post-treated in the molybdate solution, the treatment processes were optimized, a novel Ce-Mn/Mo composite conversion coating was formed and its microstructure and properties were characterized. Results The optimal film formation process parameters were as following： Na2MoO4 18 g/L, sodium dodecyl benzene sultbnate（SDBS） 1.5 g/L, conversion time 18 min, deposition temperature 45 ~C. After post-treatment, the color of the Ce-Mn coating changed from golden yellow to brownish-black. The test result showed that the Ce-Mn/Mo composite coating was uniform and dense tissue. This coating was mainly composed of Ce, Mn, Mo, O and A1 elements, and the thickness of Ce-Mn/Mo composite conversion coating was significantly increased to about 7μm. The corrosion current density was reduced by about 85%. Conclusion Compared with the CeMn coating, the Ce-M^rZMo composite coating exhibited excellent corrosion resistance, weatherability and wear resistance.

关 键 词：铝合金 Ce-Mn/Mo复合转化膜 耐蚀性 耐候性 

分 类 号：TG174.45[金属学及工艺—金属表面处理]