过电压对镁合金微弧氧化膜层性能的影响
Effects of Over-voltage on Properties of Micro-arc Oxidation Film on Mg Alloy Surface
李 泽, 马跃洲, 陈 明, 王巧霞
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作者单位：(兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室, 甘肃 兰州 730050)
中文关键字：镁合金； 微弧氧化； 过电压； 耐蚀性
英文关键字：magnesium alloy; micro-arc oxidation; over-voltage; corrosion resistance
中文摘要：采用自行研制的大功率微弧氧化电源在频率700 Hz、占空比20%的条件下进行微弧氧化实验; 并测量陶瓷膜层的厚度，观察膜层微观形貌，通过盐雾试验来评定陶瓷膜层的耐蚀性。研究发现： 随过电压的升高，镁合金微弧氧化膜层厚度增加，表面熔融物颗粒增大，膜层表面变粗糙，陶瓷层的耐蚀性呈先增加后降低的趋势；并且陶瓷膜层耐蚀性在过电压为100～150 V时较好，因此镁合金微弧氧化要选择适当的过电压。
英文摘要：The micro-arc oxidation experiments of Mg alloy with high efficiency of power were carried out, frequency is 700 Hz, dutyfactor is under 20% condition. The thickness of ceramic film was measured, the morphology of film was observed, the corrosion resistance of ceramic film was determined through salt-fog test. The results show that the thickness of film increases with overvoltage increasing. The film surface becomes rough, the ceramic level corrosion resistance displays the tendency which first increases and then reduces with the overvoltage increasing. When the over-voltage is 100~150 V, the ceramic level corrosion resistance is good. Therefore, the micro-arc oxidation of Mg alloy should choose the suitable over-voltage.