Abstract: To further improve the corrosion resistance of aluminum alloy micro-arc oxidation (MAO) films, MAO-LDHs/8-HQ composite films were obtained by three-step treatment, namely, preparing the MAO films, loading Al-Mg hydrotalcites (LDHs) and intercalating 8-hydroxyquinoline (8-HQ). The morphology and phase of the three films were analyzed, then the three films were damaged and immersed in 3.5wt% NaCl aqueous solution for 48 h. The anti-corrosion self-healing ability of the composite films was emphatically discussed by electrochemical workstation, SEM, EDS and other equipment and means. The results of morphology and physical phase analysis showed the MAO film was typical loose and porous. The Al-Mg LDHs synthesized by the hydrothermal method grew on the surface of the base film in a lamellar structure, which closed the micropores. After the intercalation treatment of LDHs, HQ- enters the interlayer of LDHs and its SEM morphology had no obvious change. Electrochemical test results showed the self-corrosion current densities of MAO-LDHs/8-HQ composite film, MAO-LDHs composite film and MAO film were 5.877×10-7, 2.262×10-6 and 7.832×10-6 A/cm2, respectively, with the former obviously smaller than the latter two. The self-corrosion potentials were-0.633,-0.611,-0.613 V, respectively, and the three were the same, which showed that the presence of 8-HQ can significantly inhibit the corrosion behavior. After 48 h salt bath corrosion, petal-like deposits rich in HQ- characteristic elements (N) appeared at the scratches of the MAO-LDHs/8-HQ composite film and attached to the substrate. The above results speculate the broken composite film released HQ- in the corrosive environment and chelated with Al3+ in the substrate to form deposits, thus achieving self-healing of the film layer.
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2023, Vol. 37 
