In recent years, micro-arc oxidation (MAO) technique is the most favorable method in the surface treatment of magnesium alloys. This method combines the electrochemical oxidation with a high voltage spark treatment in an aqueous electrolytic bath. With the introduction of high voltage spark treatment, the wear resistance, corrosion resistance, mechanical strength, and electrical insulation of the metals and their alloys can be effectively increased. It is of great importance to study the MAO procedure, to i...