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采用扫描电镜(SEM)和电子衍射能谱(EDX)研究在含K2ZrF6的溶液中AM50镁合金表面复合微弧体氧化涂层的形成过程。采用电化学阻抗谱(EIS)研究在微弧体氧化制备膜层过程中膜层耐腐蚀性能的变化。结果表明:当电压小于起弧电压时,合金表面膜层的主要成分为MgO和MgF2;当施加电压超过起弧电压时,锆氧化物开始在合金表面沉积,且膜层的耐腐蚀性随着电压的升高而提高。
The formation process of composite micro-arc oxidation coating on AM50 magnesium alloy in K2ZrF6-containing solution was investigated by scanning electron microscopy (SEM) and electron diffraction (EDX). The electrochemical impedance spectroscopy (EIS) was used to study the corrosion resistance of the coatings during the micro-arc oxidation. The results show that when the voltage is less than the starting voltage, the main components of the surface layer of the alloy are MgO and MgF2. When the applied voltage exceeds the arc starting voltage, zirconium oxide begins to deposit on the alloy surface and the corrosion resistance of the film changes with The voltage increases and increases.