There is a phenomenon of partial ablation when magnesium treated by micro arc oxidation,once the phenomenon occurs,it will ablate all workpiece to dregs;make for the magnesium alloy workpiece to scrap.The mechanism of occurring partial ablation when magnesium treated by micro arc oxidation was studied,through a great deal of different technological experiments,results show that the reason of occurring partial ablation relates with impurity substance,surface status of workpiece,electrical parameters,status o...