Method of preparing oxidation film on surface of magnesium alloy by utilizing micro-arc oxidation

The invention provides a method of preparing an oxidation film on the surface of a magnesium alloy by utilizing micro-arc oxidation. The method comprises the following steps that the magnesium alloy is placed into an electrolytic tank filled with an alkaline electrolyte, the magnesium alloy serves as an electrolytic anode, the electrolytic tank serves as an electrolytic cathode, voltage is appliedto allow plasma discharge to be generated on the magnesium alloy, the oxidation film is formed on the surface of the magnesium alloy by utilizing the micro-arc oxidation, and the components of the alkaline electrolyte are 8-12 g/L of NaOH, 10-15 g/L of Na2SiO3, 6-8 g/L of KF, 2-3 mL/L of H2O2, 6-8 mL/L of glycerol, 1-2 g/L of sodium ethylenediamine teramethylene phosphonate and the balance water;and in the micro-arc oxidation process, zeolite powder and gamma-aluminum oxide nano micropowder are sequentially added into the electrolyte, and a micro-arc oxidation reaction is continued to be carried out until the prepara