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在硅酸盐体系的电解液中加入SiC粉末,对AZ91D镁合金进行微弧氧化处理。用SEM、XRD分析加入SiC粉末对微弧氧化膜层的表面形貌特征和物相成分的影响。结果表明,加入SiC粉末后微弧氧化膜层表面的微孔变少且直径减小;膜层物相成分中增加了SiC相。在w(NaCl)=3.5%溶液中的电化学腐蚀实验结果表明,加入SiC粉末后所制备的膜层的耐腐性能显著提高。在硅酸盐体系的电解液中加入SiC粉末(浓度为5g/L),频率600Hz、占空比30%、平均电流密度15A/dm2时,可获得耐腐蚀性能较好的微弧氧化膜层。
In the silicate electrolyte system by adding SiC powder, AZ91D magnesium alloy micro-arc oxidation treatment. The effects of SiC powder on the surface morphology and phase composition of MAO coatings were analyzed by SEM and XRD. The results show that after the SiC powder is added, the micro-pores on the surface of the MAO coating decrease and the diameter decreases; the SiC phase is added to the phase composition of the coating. The results of electrochemical corrosion experiments in w (NaCl) = 3.5% solution show that the corrosion resistance of the coatings prepared by adding SiC powder is significantly improved. In the silicate system electrolyte SiC powder (concentration of 5g / L), the frequency of 600Hz, the duty cycle of 30%, the average current density of 15A / dm2, get better corrosion resistance of micro-arc oxidation coating .