The influences of Na_2WO_4’s concentration and current density on the forming process of ceramic coatings and wear resistance are studied in phosphate solution. The microstructures, ‘W’ content and components are analyzed by SEM and XPS. The result indicates: after MAO occurs, they may involve in the reaction, and then enter into ceramic coatings. The ceramic coatings prepared by micro-arc oxidation has excellent compactability and wear resistance when the concentration of Na_2WO_4 is 7 g/L. With increasing...