Effects of Al2O3 Nano-additive on Performance of Micro-arc Oxidation Coatings Formed on AZ91D Mg Alloy

doi:10.1016/j.jmst.2014.03.006

Abstract

Abstract: Ceramic coatings were prepared on AZ91D Mg alloy by micro-arc oxidation (MAO) in aluminate electrolytes, with Al₂O₃ nano-additive suspending at different concentrations. Effects of nano-additive concentration on the structure, phase composition, hardness and anti-corrosion property of the MAO coatings were analyzed by scanning electron microscopy, X-ray diffraction, micro-hardness test and electrochemical method, respectively. The results revealed that Al₂O₃ nano-particles were mostly incorporated into ceramic coating chemically, transferred into MgAl₂O₄, rather than being trapped mechanically during MAO process. With the increase of Al₂O₃ concentration, the voltage-time response, content of MgAl₂O₄, hardness and anti-corrosion property increased. However, when the concentration varied from 10 g/L to 15 g/L, these behaviors and properties changed only a little. This result indicated that, after the concentration of Al₂O₃ nano-additive reaching 10 g/L, the incorporation of Al₂O₃ nano-particles turned into a saturation state, due to the complex process during MAO treatment. Therefore, 10 g/L might be a proper concentration for MAO coating to incorporate Al₂O₃ nano-particles.

Key words: Micro-arc oxidation, Al2O3 nano-additive, Mg alloy, Corrosion, Hardness

Yan Wang, Dongbo Wei, Jie Yu, Shichun Di. Effects of Al₂O₃ Nano-additive on Performance of Micro-arc Oxidation Coatings Formed on AZ91D Mg Alloy[J]. J. Mater. Sci. Technol., 2014, 30(10): 984-990.

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Effects of Al₂O₃ Nano-additive on Performance of Micro-arc Oxidation Coatings Formed on AZ91D Mg Alloy

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