Effects of additives on properties of ceramic coatings formed by micro-arc oxidation on AZ91D Mg alloy

Chin J Mater Res

2009, Vol. 23

Issue (2): 193-198 DOI:

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Effects of additives on properties of ceramic coatings formed by micro-arc oxidation on AZ91D Mg alloy

CUI Zhuoxing^1;2; SHAO Zhongcai²; LIU Zhiyuan²; ZHAO Lixin³; TIAN Yanwen¹;

1.School of Materials & Metallurgy; Northeastern University; Shenyang 110004
2.School of Environment and Chemical Engineering; Shenyang Ligong University; Shenyang 110168
3.Key Laboratory for Superhard Materials; Mudanjiang Normal College; Mudanjiang 157012

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CUI Zhuoxing SHAO Zhongcai LIU Zhiyuan ZHAO Lixin TIAN Yanwen. Effects of additives on properties of ceramic coatings formed by micro-arc oxidation on AZ91D Mg alloy. Chin J Mater Res, 2009, 23(2): 193-198.

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Abstract

AZ91D magnesium alloy was treated by micro-arc oxidation (MAO) in electrolyte system including NaAlO₂ and (NaPO₃)₆ in this paper. Effects of tungstate and some other additives on the structure, property and component of the MAO coatings were investigated and the electrolyte subsequently was optimized with the orthogonal experimental design approach. The results show that the composite additives (Na₂EDTA1g/L, CH₃(CH₂)₁₁SO ₃Na0.5g/L) could constrain the ruinous micro-arc, which makes the porosity and microarc channel diameter of the coatings and the arcing voltage decrease; the coatings compositions mainly include MgO, Mg₃(PO₄)₂, MgAl₂O₄ and AlPO₄; ceramic coatings exhibited excellent anticorrosion property; the anticorrosion property of the MAO coatings was improved greatly with the composite electrolyte additives.

Key words: metallic materials magnesium alloy micro-arc oxidation additive electrochemistry performance

Received: 18 December 2008

Fund:

Supported by Natural Science Foundation of Liaoning Province No.2040189.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2009/V23/I2/193

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