6061铝合金微弧氧化陶瓷膜的生长动力学及性能分析  

The growth kinetics and properties of ceramic films fabricated by microarc oxidation on 6061 aluminum alloy

作　　者：薛文斌[1] 蒋兴莉[1] 杨卓[1] 张盈[1] 李夕金[1] 田华[1] 

机构地区：[1]北京师范大学低能核物理研究所射线束技术与材料改性教育部重点实验室,北京100875

出　　处：《功能材料》2008年第4期603-606,610,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(59801003);北京市科技新星计划资助项目(9558102500)

摘　　要：研究了6061铝合金微弧氧化陶瓷膜的生长规律,分析不同膜厚度下膜层截面组织、成分和相组成,并测量了氧化膜显微硬度分布和电化学腐蚀特性。氧化膜生长分为3个阶段,随着氧化时间的延长,膜层由向外生长逐渐过渡到向内生长,其表面粗糙度线形增加。氧化膜由α-Al2O3、γ-Al2O3和SiO2非晶相构成,SiO2相主要分布在外部疏松层里。显微硬度极大值随膜厚增加而增大,硬度值同α-Al2O3的相对含量密切相关。6061铝合金经过微弧氧化处理后抗腐蚀能力得到很大提高。The growth process of microarc oxidation films on 6061 aluminum alloy was investigated. Their microstructure, composition and phase constituents under different film thickness were analyzed; the microhardness profiles and electrochemical corrosion behaviors were determined. There are three stages for film growth process; the film grows towards substrate instead of outer space through the process of oxidation, and the surface roughness of film linearly increases with film thickness. The double-layer films consist of α-Al2O3, γ-Al2O3 and amorphous SiO2 phases, furthermore, Si-containing phase mainly appears in the outer layer film. The highest microhardness in the films increases with increasing the film thickness, which related to the α-Al2O3 content. The corrosion resistance of 6061 auminum alloy was strongly improved by microarc oxidation.

关 键 词：微弧氧化 6061铝合金 生长曲线 显微硬度 耐蚀性 

分 类 号：TG174.45[金属学及工艺—金属表面处理]