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    Self-healing plasma electrolytic oxidation (PEO) coating developed by an assembly of corrosion inhibitive layer and sol-gel sealing on AA2024

    Year: 2023

    Journal: Corrosion Science, Volume 222, 01/09/2023, page 111424

    Authors: Akbarzadeh, Sajjad; Coelho, Leonardo Bertolucci; Dangreau, Lisa; Lanzutti, Alex; Fedrizzi, Lorenzo; Olivier, Marie-Georges

    Keywords: Plasma electrolytic oxidation; AA2024; GDOES; Sol-gel sealing; SVET

    The inherent porous structure of PEO coatings is regarded as a drawback for long-term protection. In this investigation, the presence of pores and defects in the PEO coating was exploited as reservoirs for corrosion inhibitors to generate self-healing properties on AA2024. Smart coating systems were fabricated on the PEO layer in which 8-hydroxyquinoline (8-HQ) and benzotriazole (BTA) were employed as corrosion inhibitive layers followed by a sol-gel sealing. The protective performance relies on the mechanical interlocking between the sol-gel coating and the sublayer plus the sealing ability of the sol-gel in the presence of the intermediate layer.
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