resumo
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.
palavras-chave
NANOCONTAINERS; NETWORKS; POLYMER; CHITIN; CERIUM
categoria
Chemistry; Materials Science
autores
Zheludkevich, ML; Tedim, J; Freire, CSR; Fernandes, SCM; Kallip, S; Lisenkov, A; Gandini, A; Ferreira, MGS
nossos autores
Aleksey Lisenkov
Investigador Júnior
Alessandro Gandini
Investigador
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
João Tedim
Professor associado
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal Convidado
Silvar Kallip
Investigador AuxiliarGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
agradecimentos
This work was supported by FCT project PTDC/CTM/65632/2006. The FCT grants of J. Tedim and S. Kallip are gratefully acknowledged.