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Critical Conditions to Current Density for Micro-Arc Oxidation of Aluminum Alloy

ZHONG Tao-sheng~1,2, JIANG Bai-ling~1, LI Jun-ming~1(1. School of Material Science and Engineering, Xi′an University of Technology, Xi′an 710048; 2. School of Applied Sciences, Jiangxi University of Science and Technology, Ganzhou 341000, China)  
An MAO200/750 micro-arc oxidation equipment was performed for the micro-oxidation of deformable aluminum alloy 6061 in the presence of 2% phosphate solution as the electrolyte so as to decrease the energy loss and increase the efficiency of the micro-oxidation process. Thus the relationships among the current density and oxidation duration, the voltage and sample size, the voltage and occupation-ratio, and the oxidation duration and occupation-ratio were studied. Results showed that the critical current density for the micro-arc oxidation of aluminum alloy was 0.2 A/dm~2, and the micro-arc oxidation voltage was directly proportional to the sample size. Moreover, the micro-arc oxidation duration of the Al alloy decreased with decreasing duty ratio, while the micro-arc oxidation voltage was inversely proportional to the duty ratio.
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