Effect of Electrolyte Concentration on Electrolyte Failure in Magnesium Alloy Micro-arc Oxidization

A compact and smooth ceramic coat was prepared on the surface of magnesium alloy through micro-arc oxidation(MAO) treatment in silicate electrolyte with self-manufactured equipment.Effects of some factors,such as concentrations of SiO₃^2-,F^- and OH^- on max treatment area before inactivation were investigated by orthogonal test.The results showed that concentrations of OH^-,F^- and SiO₃^2- influence the max treatment area obviously in sequence OH^-,F^- and SiO₃^2-.A optimized electrolyte composition should be OH^-:7g/L;F^-:8g/L;SiO₃^2-:15g/L.