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在NaAlO2和Na3PO4组成的双电解液体系中对ZK60镁合金进行微弧氧化处理,通过单因素实验制备出致密、平整、耐腐蚀的涂层。采用XRD、SEM和EDS研究膜层的显微组织,并在3.5%NaCl溶液中进行静态质量损失实验,测试膜层的耐腐蚀性能。分析讨论电解液中各组元浓度对微弧氧化过程中电压—时间曲线和膜层特性的影响。结果表明:主成膜剂NaAlO2、Na3PO4及辅助添加剂NaOH、NaB4O7和C6H5Na3O7对微弧氧化过程和膜层特性有不同的影响,单变量实验优化得到的双电解液成分为17.5g/LNaAlO2,5g/LNa3PO4,5g/LNaOH,3g/LNaB4O7和4.2g/LC6H5Na3O7。
In the double electrolyte system consisting of NaAlO2 and Na3PO4, the ZK60 magnesium alloy was treated by micro-arc oxidation and the dense, flat and corrosion-resistant coating was prepared by single factor experiment. The microstructure of the film was studied by XRD, SEM and EDS. The static mass loss experiment was carried out in 3.5% NaCl solution to test the corrosion resistance of the film. The influence of the concentration of each component in the electrolyte on the voltage-time curve and the film characteristics during the micro-arc oxidation was analyzed and discussed. The results show that the main filming agent NaAlO2, Na3PO4 and auxiliary additives NaOH, NaB4O7 and C6H5Na3O7 have different effects on the micro-arc oxidation process and film properties. The single electrolyte solution has 17.5g / LNaAlO2, 5g / LNa3PO4, 5g / LNaOH, 3g / LNaB4O7 and 4.2g / LC6H5Na3O7.