Preparation technology and anti-corrosion performances of black ceramic coatings formed by micro-arc oxidation on aluminum alloys

被引:2
作者
Ling, Chen [1 ]
Jing, Han [1 ]
Yu Shengxue [1 ]
机构
[1] Yanshan Univ, Dept Appl Chem, Qinhuangdao 066004, Peoples R China
来源
RARE METALS | 2006年 / 25卷
关键词
aluminum alloy; micro-arc oxidation; black coating; anti-corrosion performance;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In order to prepare ornamental and anti-corrosive coating on aluminum alloys, preparation technology of black micro-arc ceramic coatings on Al alloys in silicate based electrolyte was studied. The influence of content of Na2WO4 and combination additive in solution on the performance of black ceramic coatings was studied; the anticorrosion performances of black ceramic coatings were evaluated through whole-immersion test and electrochemical method in 3.5% NaCl solution at different pH value; SEM and XRD were used to analyze the surface morphology and phase constitutes of the black ceramic coatings. Experimental results indicated that, without combination additives, with the increasing of Na2WO4 content in the electrolyte, ceramic coating became darker and thicker, but the color was not black; after adding combination additive, the coating turned to be black; the black ceramic coating was multi-hole form in surface. There was a small quantity of tungsten existing in the black ceramic coating beside alpha-Al2O3 phase and beta-Al2O3 phase. And aluminum alloy with black ceramic coating exhibited excellent anti-corrosion property in acid, basic and neutral 3.5% NaCl solution.
引用
收藏
页码:146 / 149
页数:4
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