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利用扫描电镜(SEM)、X射线衍射仪(XRD)、磨损试验、激光共聚焦显微镜等手段,分析了镁合金AZ91D微弧氧化陶瓷层表面、截面形貌及相组成,研究了微弧氧化试样和基体试样的磨损性能及三维形貌。结果表明,AZ91D镁合金经微弧氧化处理10 min后,陶瓷层与基体结合紧密,表面有微孔和裂纹存在且较为粗糙,陶瓷层最小厚度达62.9μm左右。陶瓷层主要由Mg2Si O4相和Mg O两相组成,膜层硬度为349.4 HV,摩擦因数达到0.119,其磨损破坏的形式主要为剥离和划伤,微弧氧化试样的耐磨性有所提高。
The surface, cross-section morphology and phase composition of the AZ91D micro-arc oxidation ceramic layer of magnesium alloy were analyzed by means of SEM, XRD, wear test and laser confocal microscopy. Abrasion properties and three-dimensional topography of sample and matrix specimen. The results show that the microstructure of AZ91D magnesium alloy after micro-arc oxidation treatment for 10 min is characterized by tight bonding between the ceramic layer and the substrate, micropores and cracks on the surface, and roughness of the ceramic layer. The minimum thickness of the ceramic layer reaches about 62.9 μm. The ceramic layer mainly consists of two phases, Mg2SiO4 and MgO. The hardness of the ceramic coating is 349.4 HV and the friction coefficient reaches 0.119. The wear damage mainly consists of peeling and scratching, and the wear resistance of microarc oxidation samples is improved .