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In this paper, ceramic coatings were prepared on the surface of 7050 high strength aluminum alloy using a micro-arc oxidation process in a silicate electrolyte combined with the rare earth element cerium or graphene. To analyze the surface morphology, roughness, phase composition, and corrosion resistance, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectrometry, and electrochemical measurements were used, respectively. It was shown that the micropore size of the composite coatings, which mainly consisted of α-Al 2 O 3  and γ-Al 2 O 3 , decreases and the density improved with the simultaneous addition of 4 g · L-1 of CeO 2  and 10 g · L -1  of graphene to the electrolyte. In addition, with the addition of CeO 2  and graphene, the roughness was the lowest and the corrosion resistance was significantly improved.

Microstructure and properties of rare earth CeO 2 -doped graphene composite coatings prepared by MAO on AA7050