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Self-healing protective coatings with “green” chitosan based pre-layer reservoir of corrosion inhibitor

2011; Royal Society of Chemistry; Volume: 21; Issue: 13 Linguagem: Inglês

10.1039/c1jm10304k

1364-5501

Mikhail L. Zheludkevich, João Tedim, Carmen S. R. Freire, Susana C. M. Fernandes, Silvar Kallip, Aleksey D. Lisenkov, Alessandro Gandini, M.G.S. Ferreira,

Concrete Corrosion and Durability

A new type of corrosion protective self-healing coating is reported in the present study. The coating is constituted by a chitosan-based pre-layer deposited onto the metal surface and a barrier hybrid film. The chitosan film doped with cerium ions serves as a reservoir for the corrosion inhibitor. The cerium ions form a complex with the functional groups of chitosan macromolecules providing a prolonged release of the active agent on demand. The developed bi-layer protective coating was applied to aluminium alloy 2024, which is widely used in the aeronautical industry. The results obtained from electrochemical impedance spectroscopy clearly demonstrate a superior corrosion protection when the coating with the cerium-doped biopolymer pre-layer is used. The localized electrochemical study in micro-confined defects showed a well-defined self-healing ability of the developed coating system.