提出了一种以镁合阳极极化曲线来判断微弧氧化起弧难易的新方法。在不同的电解液中,测试了镁合金的阳极极化曲线及微弧氧化的起弧特性。结果表明,起弧电压首先与其在对应电解液中进行阳极极化时形成的钝化膜的稳定性有关:膜层越稳定,即阳极极化曲线上钝化区宽度越宽,则在相应的电解液中微弧氧化起弧电压越低;当钝化区间宽度相近时,则在钝化区间后期极化电流越小,起弧电压越低。 A new method of judging the difficulty of arcing with micro-arc oxidation by using magnesium anodic polarization curve is proposed. In different electrolytes, the anodic polarization curve of magnesium alloy and the arcing behavior of MAO were tested. The results show that the arc starting voltage is firstly related to the stability of the passivation film formed by anodic polarization in the corresponding electrolyte: the more stable the film layer, the wider the passivation region on the anodic polarization curve, The lower arc ignition voltage of micro-arc oxidation in the electrolyte; when the width of the passivation interval is similar, the smaller the polarization current in the late passivation interval, the lower the arc starting voltage.