广西科学院学报2018，Vol.34Issue(4)：274-278,5.DOI:10.13657/j.cnki.gxkxyxb.20181204.001
工作电压对微弧氧化6061铝合金耐腐蚀性能的影响
Effect of Working Voltage on Corrosion Resistance of Micro-Arc Oxidation of 6061 Al-Alloy
摘要
Abstract
[Objective]In order to enhance the corrosion resistance of Al-alloys, the ceramic coating on the surface of 6061 Al-alloy were prepared by micro-arc oxidation (MAO), in constant pressure AC mold.The effect of working voltage on the corrosion properties of MAO coatings was studied.[Methods]Scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemistry impedance spectroscopy (EIS)and coating thickness tests were used to the influence of working voltage on coating growth, phase composition and corrosion resistance, and the influence mechanism of working voltage was analyzed.[Results]The results showed that the surface morphologies of MAO coating on 6061 aluminum alloys were similar to the porous volcano-like microstructures.When the voltage was lower than 450 V, the thickness of the coatings increased with the increase of working voltage.At the same time, the number of crater-shaped discharge holes increased, the main phase of the coating wasβ?Al2 O3 and a small amount ofα?Al2 O3.After the working voltage was greater than 450 V, the number of crater-shaped discharge holes decreased, on the contrary, the diameter of the channels increased.When the working voltage increased to 500 V, the coating began to show micro-cracks, and the corrosion resistance first increased and then weakened.[Conclusion]When the working voltage was 450 V, resistance of discharge micro-pore in porous layer of the coatings Rp was 2.875×106Ω·cm2, and resistance of corrosion reaction charge transfer in matrix metal was 7.575×106Ω·cm2, which showed better corrosion resistance than other prepared coatings.关键词
微弧氧化/铝合金/耐腐蚀性能/工作电压Key words
micro-arc oxidation/aluminum alloy/corrosion resistance/working voltage分类
矿业与冶金引用本文复制引用
朱庆军,汪彬彬,赵霞,侯保荣..工作电压对微弧氧化6061铝合金耐腐蚀性能的影响[J].广西科学院学报,2018,34(4):274-278,5.基金项目
海洋环境腐蚀与生物污损公共服务平台项目资助 （）
