A new method on predicting arc-initiating of micro-arc oxidation on magnesium alloy by anodic polarization curve

A new method on predicting arc-initiating of micro-arc oxidation on magnesium alloy by anodic polarization curve was proposed. Anodic polarization behavior and discharge characteristic were tested in different solutions. The results show that arcing voltage is much dependent on the stability of passivating films formed during anodic polarization process. The arcing voltage is higher with a larger width of passivation region of the polarization curve. When the stability of passivating films is at about the same level, the arcing voltage becomes lower in the solution possessing a smaller polarization current at the later section of passivation curves.