Optimizing the micro-arc oxidation (MAO) parameters to attain coatings with minimum porosity and maximum hardness on the friction stir welded AA6061 aluminium alloy welds  

作　　者：R. Kamal Jayaraj S. Malarvizhi V. Balasubramanian 

机构地区：[1]Centre for Materials Joining and Research(CEMAJOR),Department of Manufacturing Engineering,Annamalai University,Annamalai Nagar,608 002,Tamil Nadu,India

出　　处：《Defence Technology（防务技术）》2017年第2期111-117,共7页Defence Technology

基　　金：Council of Scientific and Industrial Research (G8/19901/2013), New Delhi for the financial support provided to conduct this investigation through sponsored project No. 22(0615)/13/EMR-II dated 26.02.2013

摘　　要：Micro-arc oxidation(MAO) technique is capable of producing dense oxide films on the aluminium alloy surface. This oxide film protects the aluminium alloy from the corrosion attack for longer duration.Empirical relationships were derived to evaluate the MAO coating properties(porosity and hardness) by incorporating very important MAO parameters(current density, inter-electrode distance and oxidation time). MAO parameters were also optimized to achieve coatings with minimum porosity and maximum hardness. Further, the effect of MAO parameters on coating characteristics was analysed. From the results, it is found that the current density has greater influence on the responses than the other two parameters.Micro-arc oxidation(MAO) technique is capable of producing dense oxide films on the aluminium alloy surface. This oxide film protects the aluminium alloy from the corrosion attack for longer duration.Empirical relationships were derived to evaluate the MAO coating properties(porosity and hardness) by incorporating very important MAO parameters(current density, inter-electrode distance and oxidation time). MAO parameters were also optimized to achieve coatings with minimum porosity and maximum hardness. Further, the effect of MAO parameters on coating characteristics was analysed. From the results, it is found that the current density has greater influence on the responses than the other two parameters.

关 键 词：Micro-arc oxidation Aluminium alloy Friction STIR weld Response surface methodology 

分 类 号：TG174.4[金属学及工艺—金属表面处理]