Influence of cathodic current on composition, structure and properties of Al2O3 coatings on aluminum alloy prepared by micro-arc oxidation process

被引：90
|
作者：
Xin, Shigang [1 ]
Song, Lixin [1 ]
Zhao, Ronggen [1 ]
Hu, Xingfan [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
来源：
THIN SOLID FILMS | 2006年 / 515卷 / 01期
关键词：
aluminum alloy; micro-arc oxidation; cathodic current; coating;
D O I：
10.1016/j.tsf.2005.12.087
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Alumina coatings on aluminum alloy were prepared by micro-arc oxidation (MAO) process using DC and AC power supplies, respectively. In comparison with the coating deposited by DCMAO, the influence of the cathodic current on the composition, structure and properties of the ACMAO coating was investigated. It is found that the coating deposited by DCMAO is composed of alpha-Al2O3, whereas the coating deposited by ACMAO has a mixture composition of alpha-Al2O3 and gamma-Al2O3. The results of properties show that compared with the coatings deposited by DCMAO, the ACMAO coatings possess higher density, hardness and corrosion resistance. It can be attributed to that the DCMAO coating is rougher and existing much more micro-cracks in its inner layer. As a result, the adhesion of the DCMAO coating to the substrate decreases. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：326 / 332
页数：7
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