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.

为提高7075铝合金微弧氧化（MAO）涂层的耐腐蚀性，涂层中吸附沉积了3 g/L的石墨烯。_{然后，通过用TiO 2}溶胶-凝胶封闭涂层的微孔，获得微弧氧化-溶胶-凝胶（MAO-SG）复合涂层。7075铝合金基体、未掺杂样品、掺杂石墨烯样品和密封样品在3.5wt.% NaCl溶液中进行电化学测试。结果表明，与空白样品相比，密封样品的自腐蚀电位提高了98.1%，自腐蚀电流密度降低了4个数量级。浸泡腐蚀720 h后，MAO-SG复合涂层的腐蚀速率为3.4×10 ^–5 mm/a，其耐腐蚀性仍优于单层 MAO 涂层。这是由于石墨烯的强导电性和 TiO ₂溶胶-凝胶的阻挡作用。