Preparation method of green ceramic membrane on surface of magnesium alloy

The invention belongs to the field of surface treatment methods of magnesium alloy materials, and particularly relates to a preparation method of a green ceramic membrane on the surface of a magnesium alloy, a phosphate system is used as a main salt, iron salt and triethanolamine are complexed to form a coloring metal salt, a coloring electrolyte is prepared in a strong alkaline environment, and the electrolyte does not contain harmful elements such as vanadium and chromium, and can be used for preparing a green ceramic membrane on the surface of the magnesium alloy. And the pollution to the environment is reduced. A green ceramic membrane which is uniform in color, high in adhesive force and compact in surface is prepared on the surface of the magnesium alloy by adopting depressurization type two-step constant-current micro-arc oxidation treatment, and the green ceramic membrane has excellent properties such as high wear resistance and corrosion resistance. The technical process is simple and efficient in op