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Magnesium alloy have good physical properties such as good castability, good vibration absorption,high strength/weight ratios. Despite the desirable properties, the poor resistance of Mg alloy impedes their use inmany various applications. Therefore, magnesium alloy require surface treatment to improve hardness, corrosionand wear resistance. Plasma Electrolytic Oxidation (PEO) is one the surface treatment methods to form oxidelayer on Mg alloy in alkali electrolyte. In comparison with Anodizing, there is environmental process having higherhardness and faster deposition rate. In this study, the characteristies of oxide film were examined after coating theAZ31 Mg alloy through the PEO process. We changed concentration of sodium aluminate into K 2 ZrF 6 , KF baseelectrolyte. The morphologies of the coating layer were characterized by using scanning electron microscopy(SEM). Corrosion resistance also investigated by potentiodynamic polarization analysis. As a result, propertiy ofoxide layer were changed by concentration of sodium aluminate. Increasing with concentration of sodium alumi-nate in electrolyte, the oxidation layer was denser and the pore size was smaller on the surface.(Received July 27, 2012; Revised August 13, 2012; Accepted August 20, 2012)Key words: PEO, Plasma electrolytic oxidation, MAO, Micro arc oxidation, AZ31, Magnesium alloy

Effect of Sodium Aluminate Concentration in Electrolyte on the Properties of Anodic Films Formed on AZ31 Mg Alloy by Plasma Electrolytic Oxidation