Abstract
To improve the corrosion resistance of 7075 aluminum alloy microarc oxidation (MAO) coating, graphene of 3 g/L was adsorbed and deposited in the coating. Then, the microarc oxidation–sol–gel (MAO-SG) composite coating was obtained by sealing the micropores of the coating with TiO2 sol–gel. Electrochemical tests of 7075 aluminum alloy matrix, undoped sample, doped graphene sample and sealed sample were carried out in 3.5wt.% NaCl solution. The results show that compared with the blank sample, the self-corrosion potential of the sealed sample is increased by 98.1%, and the self-corrosion current density is reduced by 4 orders of magnitude. After immersion corrosion for 720 h, the corrosion rate of MAO-SG composite coating is 3.4 × 10–5 mm/a, and its corrosion resistance is still better than that of single MAO coating. This is due to the strong conductivity of graphene and the blocking effect of TiO2 sol–gel.
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Acknowledgements
The author (Dr. Chen) is thankful to the National Natural Science Foundation of China (No 51774249) and the Open Fund (PLN2021-22) of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) for carrying out this research investigation
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Chen, X.W., Cai, L.P., Zhang, D.F. et al. Microstructure and Corrosion Behavior of MAO-SG Composite Coating on 7075 Aluminum Alloy. Trans Indian Inst Met 75, 2931–2938 (2022). https://doi.org/10.1007/s12666-022-02673-8
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DOI: https://doi.org/10.1007/s12666-022-02673-8