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张伟一,杜云慧,王玉洁,朱 宇,陆 钦,张 鹏.微弧氧化膜层的组分质量比率、结构与性能[J].稀有金属材料与工程(英文),2021,50(1):311~319.[zhang weiyi,du yunhui,wang yujie,zhu yu,lu qin and zhang peng.Component Mass Ratio, Microstructure and Performance of Micro-arc Oxidation coating[J].Rare Metal Materials and Engineering,2021,50(1):311~319.]
Component Mass Ratio, Microstructure and Performance of Micro-arc Oxidation coating
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Received:February 06, 2020  
DOI:
Key words: micro-arc oxidation coating  composite dielectric ordinal discharge  microstructure  performance
Foundation item:大学生创新创业训练计划资助项目(202010004006);国家自然科学(50974010);北京市自然科学(2162036)
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zhang weiyi,du yunhui,wang yujie,zhu yu,lu qin and zhang peng  
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Abstract:
      In order to improve the electrochemical corrosion and wear performance of MgF2+MgO MAO (micro-arc oxidation) coating on AZ61 simultaneously, composite dielectric ordinal discharge thought was used to weaken the eruption of breakdown melt and hence densify the coating and enhance its performance. α (MgF2-MgO mass ratio), microstructure, electrochemical corrosion and wear performance of coatings were investigated. The results show that the weakening effect on eruption of breakdown melt for coating with α=1.2 is obviously better than that with α=0.1 and 11.8. The thickness of inner dense layer is thickened to 3.6 μm, which is about three times as thick as that of the existing MAO coating. The impedance of outer loose layer is enhanced to 13555 Ω cm2, which is about 30% larger than that of α=0.1 and 11.8. Ecorr (corrosion potential) of AZ61 is increased from -1.912 to -0.455 VSCE, Icorr (corrosion current density) is decreased from 378.6 to 0.453 (10-6 A/cm2) and the wear rate is reduced from 921 to 0.5 (10-5 mm3/N.m) by this densified micro-arc oxidation coating. This investigation provides a novel processing mode for outstanding MAO coating.