Surface treatment method for improving fatigue property of magnesium alloy in corrosion environment

The invention discloses a surface treatment method for improving the fatigue property of magnesium alloy, particularly in a Cl-containing corrosion environment, and particularly relates to a surface treatment method for improving the fatigue property of magnesium alloy in a corrosion environment. The surface treatment method comprises the following steps: sequentially performing surface electrolytic polishing treatment, shot blasting pre-deformation enhanced treatment and micro-arc oxidation treatment on magnesium alloy to finally obtain a magnesium alloy shot blasting/micro-arc oxidation compound treatment film so as to finish surface treatment of magnesium alloy. According to the surface treatment method, shot blasting enhanced treatment is performed on magnesium alloy by adoption of glass balls, so that residual compressive stress on a magnesium matrix is increased, and crack production and expansion on the magnesium matrix are inhibited; besides, the compactness of a magnesium alloy micro-arc oxidation ceramic layer is improved through pre-deformation, and magnesium alloy corrosion crack sources are reduced; and moreover, the micro-arc oxidation growth rate is improved by pre-deformation, the oxidation time is shortened, and the production cost of electric energy is lowered.