微弧氧化法制备镁合金陶瓷膜的研究

采用双极性脉冲电源对置于Na2Al2O4溶液中的AZ91D镁合金进行微弧氧化处理，研究了溶液配方和电源参数（包括电压、频率、占空比等）对微弧氧化膜的组成与结构的影响。结果表明：不同的电参数作用下形成的氧化膜的结构是相似的，膜层由内层致密层和外层疏松层组成，其主要物相组成是Mgo和MgAl2O4；不同电参数对膜层的厚度的影响各不相同，随着电压和占空比的增大，膜层增厚速度将加大，而频率的影响则与之相反。

Study on the fabrication of ceramic coat of magnesium alloy by microarc oxidation

Micro-arc oxidation is undertaken for the magnesium alloy of AZ91D dipped in the solution of Na2Al2O4 with double-polarity pulse power supply to make a micro-oxidation coat over the magnesium alloy.The influence of the solution formula and electric parameters(including voltage,frequency and duty ratio etc) on the shape,formation and depth of oxidation coat is studied.It is shown by the result that the key factor to form coat is the solution formula;different electric parameters make similar structure of oxidation coat;the oxidation coat is composed of two sub-coats,dense in the inner one and loose on the outer one,whose main composites are MgO and MgAl2O4;different electric parameters make different depths of coat.The acceleration of coat depth increases with the acceleration of voltage and duty ratio,but the influence of frequency goes the other way.