在自主研制的铝酸钠-磷酸钠复合电解液体系中，采用不同的正向电压(220~340 V)对ZK60变形镁合金进行微弧氧化，在镁合金表面制备陶瓷膜层。利用扫描电镜、超景深光学显微镜及能谱仪观察分析膜层组织，通过电流变化及放电现象分析微弧氧化过程，并用全浸实验和电化学阻抗法测试膜层在3.5%NaCl(质量分数)介质中的耐腐蚀性能。结果表明：电流平稳阶段是膜层的主要生长阶段，正向电压是微弧氧化过程的重要驱动力，电压过高或过低都不利于获得优质膜层。280 V正向电压下制备的膜层组织较为均匀致密，其腐蚀速率较低，为0.2054 g/(m2?h)，此时膜层电化学阻抗模值为正向电压340 V下膜层的3倍。
Micro-arc oxidation (MAO) process was conducted on ZK60 Mg alloy in a self-made aluminate-phosphate dual electrolyte system containing aluminate and phosphate with positive voltage from 220 to 340 V. A MAO coating was prepared on the surface of ZK60 Mg alloy. The microstructure characteristics of coatings were investigated by scanning electron microscope (SEM), super depth of field microscope and energy dispersive spectrometer (DSC). The process evolution was evaluated through current change and electric discharge phenomena. The corrosion resistance of coatings was measured in 3.5% NaCl (mass fraction) solution by immersion test and electrochemical impedance spectroscope (EIS). The results show that the main growth of coating takes place in stable current stage and positive voltage is an important driving force for better MAO coating. A uniform and compact MAO coating can be obtained under certain suitable positive voltage. The MAO coating prepared at 280 V exhibits good corrosion resistance with corrosion rate of 0.2054 g/(m2?h), and its impedance value is as 3 times as that of coating made at 340 V.
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