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KMnO4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 Na2 MoO4,1.5 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。
ABSTRACT: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 sulfonate(SDBS)1. 5 g/L, conversion time 18 min, deposition temperature 45 ℃. 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 Al elements, and the thickness of Ce-Mn/Mo composite conversion coating was sig-nificantly increased to about 7 μm. The corrosion current density was reduced by about 85%. Conclusion Compared with the Ce-Mn coating, the Ce-Mn/Mo composite coating exhibited excellent corrosion resistance, weatherability and wear resistance.
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