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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 3: 612 - 616

DOI: https://doi.org/10.3724/SP.J.1077.2009.00612

Research Paper

Structure and Properties of Microarc Oxidation Coatings on SiCP/AZ31 Magnesium Matrix Composite

  • XUE Wen-Bin ,
  • JIN Qian ,
  • ZHU Qing-Zhen ,
  • MA Yue-Yu
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  • 1. Key Laboratory of Beam Technology and Materials Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China; 2. Composite Materials Center, General Research Institute of Nonferrous Metals, Beijing 100088, China

Received date: 2008-08-22

  Revised date: 2008-10-31

  Online published: 2009-05-20

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Abstract

The protective ceramic coatings were prepared on SiC particle reinforced magnesium matrix composite by microarc oxidation (MAO) surface treatment technique. The surface morphology, cross-sectional microstructure and phase constituent of ceramic coatings were analyzed. And the microhardness profile, thermal shock resistance and electrochemical corrosion behavior of the coatings were measured. The ceramic coating consists of MgO, Mg2SiO4 and a few phases related to the electrolyte elements. Furthermore, a few residual SiC reinforced particles are also remained in the coatings. The maximum hardness of the coating is about HV800, which is at least five times higher than that of the uncoated composite substrate. The coatings do not detach from composite substrate after the coated samples undergo 100 thermal shocks, heating the sample to 500℃ and then quenching into water, which displays a good thermal shock resistance for the MAO coatings on SiCP/AZ31 composite. In addition, after MAO surface treatment, the corrosion resistance of the SiCP/AZ31 composite is greatly improved.

Key words： microarc oxidation; magnesium matrix composites; ceramic coating; properties

Cite this article

XUE Wen-Bin , JIN Qian , ZHU Qing-Zhen , MA Yue-Yu . Structure and Properties of Microarc Oxidation Coatings on SiCP/AZ31 Magnesium Matrix Composite[J]. Journal of Inorganic Materials, 2009 , 24(3) : 612 -616 . DOI: 10.3724/SP.J.1077.2009.00612

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