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Citation: ZHONG Tao-Sheng, LI Xiao-Hong, JIANG Bai-Ling. Growing Rate of Micro-arc Oxidation Coating on 6061 Aluminum Alloy[J]. Chinese Journal of Applied Chemistry, ;2009, 26(6): 692-696. shu

Growing Rate of Micro-arc Oxidation Coating on 6061 Aluminum Alloy

1.
a School of Applied Sciences, Jiangxi University of Science and Technology, Ganzhou 341000;
2.
b School of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048

Corresponding author: ZHONG Tao-Sheng,
Received Date: 5 June 2008
Available Online: 16 September 2008
Fund Project: 国家“八六三”基金资助项目(2002AA331120) (2002AA331120)

In a solution containing 8 g/L sodium hexametaphosphate and 5 g/L sodium silicate,the influences of current density,duty cycle,sample dimension and solution temperature on the growing rate of MAO coatings on 6061 aluminum alloy were investigated.The results indicate that under high current density and voltage on sample surface,the growing rate of the coating increases linearly at a rate of 1.425 0×10^-9 m³/(min·A) with the increasing of current density due the ability of high voltage to break down the MAO coatings that are continuously oxidized.Duty cycle has no impact on the growing rate of the coating,and the growing rates of different duty cycles are approximately 0.50 μm/min,but the voltage rises slightly with decreasing duty cycle.Growing rates of different dimension samples are 0.31 μm/min,while voltage increases with the increase of the sample size.The rising of solution temperature enhances the dissociation degree of HSiO₃^- and H₂PO₃^2-,improving the conductions of solution and ion diffusivity,which increases the growing rate of coating,and the growing rates under 10 ℃,20 ℃and 30 ℃ are 0.35 μm/min,0.38 μm/min,0.41 μm/min,respectively.
- micro-arc oxidation,
- aluminum alloy,
- growing rate
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