采用微弧氧化表面处理技术在SiC颗粒增强AZ31镁基复合材料表面制备保护性陶瓷膜.分析了陶瓷膜的表面形貌、截面组织和相组成，并测量了膜层的硬度、热震和电化学腐蚀特性.结果表明，陶瓷膜由MgO、Mg2SiO4和少量同电解液组成元素相关的相所组成，膜内还残留少量SiCP增强体.膜层的最高硬度可达到HV800，比复合材料基体提高五倍以上.经过100次热循环(500℃→水淬)后膜层与复合材料结合良好，显示该膜层有较好的抗热震性能.微弧氧化处理后，SiCP/AZ31镁基复合材料的抗腐蚀能力得到较大提高.
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.
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