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采用自制的恒流非对称方波电源用微弧氧化法在AZ91D镁合金表面制备了耐腐蚀陶瓷膜,通过微观分析手段对微弧氧化膜的截面特征、元素成分分布及表面膜的相组成进行了分析,研究了微弧氧化工艺参数对膜层表面形貌、微观结构与组成等的影响。结果表明,提高电流密度会造成组织疏松微孔孔径增大;硅酸盐溶液中微弧氧化制得的陶瓷膜优于铝酸盐溶液。而且电解液中的离子可参与成膜反应,硅酸盐溶液体系镁合金微弧氧化陶瓷层主要由MgO和Mg2SiO4相组成,铝酸盐溶液体系微弧氧化膜层主要由MgAl2O4相组成。
The corrosion resistance of AZ91D magnesium alloy was studied by micro-arc oxidation with self-made constant current asymmetrical square wave power source. The cross-sectional characteristics, elemental composition distribution and surface phase composition of the micro-arc oxidation film were analyzed by means of microanalysis Analyzed and studied the influence of micro-arc oxidation process parameters on the surface morphology, microstructure and composition of the film. The results show that increasing the current density can lead to the increase of the pore size of the loose microstructure. The ceramic coating prepared by micro-arc oxidation in silicate solution is superior to the aluminate solution. Moreover, the ions in the electrolyte can participate in the film formation reaction. The MAO coatings on the MAO coating consist mainly of MgO and Mg2SiO4 phases. The MAO coating on the aluminate solution is mainly composed of MgAl2O4 phase.