Microstructure and Corrosion Resistance of Black Microarc Oxidation Ceramic Coatings on Magnesium Alloy
Black micro-arc oxidation (MAO) ceramic coatings were prepared on magnesium alloy in a silicate electrolyte; SEM, EDS and XRD were tested to analyze surface morphology, chemical composition and phase composition of ceramic coatings, Corrosion resistant in 3.5％ NaCl aqueous solution of magnesium alloy before and after MAO treatment was evaluated by polarization curves and electrochemical impedance spectroscopy (EIS); the weight loss of magnesium alloy with black MAO ceramic coatings in 3.5％ NaCl aqueous solution was studied through immersion experiment. The results indicated that, the black MAO ceramic coatings was composed by Mg、Al、Si、Cu and O; black MAO ceramic coatings could protect magnesium alloy substrate effectively; the corrosion resistant of black MAO ceramic coatings in neutral 3.5% NaCl solution was favorable.
Jimmy (C.M.) Kao, Wen-Pei Sung and Ran Chen
S. X. Yu et al., "Microstructure and Corrosion Resistance of Black Microarc Oxidation Ceramic Coatings on Magnesium Alloy", Advanced Materials Research, Vols. 581-582, pp. 427-430, 2012