Formation process of composite plasma electrolytic oxidation coating containing zirconium oxides on AM50 magnesium alloy

来源期刊:中国有色金属学报(英文版)2011年第4期

论文作者:刘锋 单大勇 宋影伟 韩恩厚

文章页码:943 - 948

关键词:微弧氧化膜;锆氧化物;MgO;耐腐蚀性

Key words:plasma electrolytic oxidation coating; zirconium oxide; MgO; corrosion resistance

摘    要:

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。

Abstract: The formation processes of a composite ceramic coating on AM50 magnesium alloy prepared by plasma electrolytic oxidation (PEO) in a K2ZrF6 electrolyte solution were studied by scanning electron microscope (SEM) and energy dispersive X-ray spectroscope (EDX). Electrochemical impedance spectroscopy (EIS) tests were used to study the variation of the corrosion resistance of the coating during the PEO treatment. The results show that the coating formed on Mg alloy is mainly composed of MgO and MgF2 when the applied voltage is lower than the sparking voltage, and zirconium oxides start to be deposited on Mg substrate after the potential exceeding the sparking voltage. The corrosion resistance of the coating increases with increasing the applied voltage.

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