在硅酸盐体系中,采用恒压模式对高稀土镁合金进行微弧氧化获得陶瓷膜防护涂层。通过正交试验,以陶瓷膜的耐腐蚀性和腐蚀电流密度为评价指标,对硅酸盐体系电参数工艺进行了研究,得到最佳电参数工艺为:频率800 Hz,正电压为500 V,负电压为250 V,占空比为20%,氧化时间为15 min,其中正电压对微弧氧化膜的影响程度最大。用扫描电镜分析了最佳工艺参数下的表面形貌和腐蚀后的表面形貌。结果表明:采用双极性非对称脉冲电源所得到的微弧氧化膜表面形貌只存在显微孔而不存在微裂纹,在腐蚀过程中点蚀拓展阻力比较大,提高了耐蚀性。 In the silicate system, using a constant voltage mode of high-rare-earth magnesium alloy micro-arc oxidation ceramic coating protective coating. Through orthogonal test, the corrosion resistance and corrosion current density of ceramic membrane were used as evaluation indexes to study the electrical parameters of silicate system. The optimum electrical parameters were as follows: frequency 800 Hz, positive voltage 500 V, The negative voltage is 250 V, the duty cycle is 20% and the oxidation time is 15 min, of which the positive voltage has the greatest influence on the micro-arc oxidation film. The surface morphology and the surface morphology after corrosion were analyzed by scanning electron microscopy. The results show that there are only micro-pores and no micro-cracks in the surface morphology of micro-arc oxidation film obtained by bipolar asymmetric pulse power supply. The corrosion resistance of pitting corrosion is improved greatly during the corrosion process.