To further enhance the wear resistance and corrosion resistance of micro-arc oxidation (MAO) film on 2A12 aluminum alloy, MAO process based on sodium hexametaphosphate solution system was carried out. The effects of doping graphene on the properties (such as morphology, thickness, wear resistance, corrosion resistance and hardness) of MAO film were studied by adding different concentrations of graphene dispersions. The results show that the MAO
film with the best properties is obtained when the mass concentration of graphene is 0.4 g/L. Micro-pores and microcracks in the MAO film are significantly reduced, and the thickness of film is also increased. Compared to the MAO film prepared without doping graphene, the hardness of the graphene-doped MAO film is increased by 73%, the wear amount is decreased by 8.2 mg, the self-corrosion potential is increased by 0.294 V and the self-corrosion current density is decre ased by 2 orders of magnitude.