在已优化的Na2SiO4-Na3PO4复合体系溶液中加入Al2O3粉末对AZ91D镁合金进行了微弧氧化处理。用SEM、XRD分析了加入Al2O3粉末对陶瓷膜的形貌特征和相成分的影响。结果表明，加入Al2O3粉末后陶瓷膜孔洞减少，且疏松层变得紧实;膜层相成分增加了Al2O3。在3.5% NaCl 溶液中的电化学腐蚀试验表明，加入Al2O3粉末后陶瓷膜的耐蚀性有很大提高。
AZ91D magnesium alloy was treated by micro-arc oxidation (MAO) in the optimized composite solution of silicate-phosphate system in which Al2O3 powders were added.Morphological characteristic and phase constituent of ceramic coatings were analyzed using the scanning electron microscope (SEM) and the x-ray diffraction (XRD).The results showed that after adding Al2O3 powders pores in ceramic coatings decreased and the loose layer became more compact，new phase of Al2O3 appeared.Electrochemical corrosion experiments in 3.5%NaCl solution showed that corrosion resistance of ceramic coatings after adding Al2O3 powders was also improved greatly.
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