The effect of the presence of an anodic film and hybrid sol-gel coating loaded with corrosion inhibitors was evaluated as a strategy for enhanced barrier and active corrosion protection of aluminium alloy 2024-T3. In this study, AA2024-T3 specimens were anodized in a modified sulphuric-citric acid bath (SCA) as the first layer of a corrosion protective multilayer system and subsequently protected by the application of silica-based hybrid sol-gel coatings. These coatings were doped with LiNO₃ and Ce(NO₃)₃ as corrosion inhibitors and studied in comparison with the inhibitor-free sol-gel coating in terms of morphology, composition and corrosion protection of intact and scribed specimens. The anodized AA2024-T3 with an overlaying inhibitor-free sol-gel coating showed the highest impedance modulus during long-term immersion in 0.1 mol·L⁻¹ NaCl aqueous solution. Active corrosion protection of scribed coated specimens was studied by exposure to a 0.5 mol·L⁻¹ NaCl solution and evaluated by surface analytical techniques. The addition of Li- and Ce-based salts into the hybrid sol-gel formulation showed active corrosion protection compared to the inhibitor-free scribed hybrid sol-gel coating. The Ce-doped sol-gel coating showed less visual corrosion and higher active corrosion protection than the Li-containing one during the long-term immersion test in 0.5 mol·L⁻¹ NaCl. Present findings reveal that the combination of the anodic/hybrid sol-gel layers on AA2024-T3 enhances the corrosion protective properties barrier properties of both stand-alone systems and the incorporation of Li- and Ce-based inhibitors provide active corrosion.

评估阳极膜和负载了缓蚀剂的混合溶胶-凝胶涂层的影响，作为增强铝合金2024-T3的阻隔性和主动腐蚀保护的策略。在这项研究中，AA2024-T3标本在改良的硫酸柠檬酸浴（SCA）中进行阳极氧化，作为腐蚀防护多层系统的第一层，随后通过使用二氧化硅基混合溶胶-凝胶涂料进行保护。这些涂层掺杂有LiNO ₃和Ce（NO ₃）₃作为腐蚀抑制剂，并与无抑制剂溶胶-凝胶涂层进行了比较，研究了完整和划痕样品的形态，组成和腐蚀防护。带有无抑制剂的溶胶-凝胶涂层的阳极氧化AA2024-T3在长期浸入0.1mol·L ^-1 NaCl水溶液中显示出最高的阻抗模量。通过暴露于0.5mol·L ^-1来研究划线涂层样品的主动腐蚀防护NaCl溶液并通过表面分析技术进行评估。与不含抑制剂的划线杂化溶胶-凝胶涂料相比，在杂化溶胶-凝胶配方中添加基于锂和铈的盐具有积极的腐蚀防护作用。在0.5mol·L ^-1 NaCl中进行长期浸没测试时，掺Ce的溶胶-凝胶涂层比含Li的涂层表现出更少的视觉腐蚀和更高的活性腐蚀防护。目前的发现表明，AA2024-T3上的阳极/混合溶胶-凝胶层的组合增强了两个独立系统的防腐性能，并且掺入了基于Li和Ce的抑制剂可提供主动腐蚀。