Preparation and Corrosion Resistance of Micro-arc Oxidation/Self-Assembly Composite Film on 6061 Aluminum Alloy

摘要

The aluminum alloy has some advantages and has wide application in modern life. However, aluminumalloys are easily corroded by corrosive substances in the environment, thus affecting their service life.In order to improve the corrosion resistance of the aluminum alloy surface, The composite film wasprepared by micro-arc oxidation, self-assembly and doping, which were micro-arc oxidation (MAO),bis[3-(triethoxysilyl)propyl]tetrasulfide(BTESPT) and graphene oxide (GO). The morphology andcomposition of the composite film (MAO/BTESPT/GO) were tested by SEM, EDS. The salt spray test,Tafel polarization curve and electrochemical AC impedance were used to test the corrosion resistanceof the composite film. The results shown that the micro-arc oxidation-self-assembled composite filmhad excellent corrosion resistance. And the corrosion current density of the composite film was reducedby 5 orders of magnitude compared with the substrate. The salt spray test results shown that the corrosionresistance of the composite film was greatly improved compared with that of the matrix and the self-assembled film. The composite film exhibited excellent corrosion resistance.