abstract
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.
keywords
NANOCONTAINERS; NETWORKS; POLYMER; CHITIN; CERIUM
subject category
Chemistry; Materials Science
authors
Zheludkevich, ML; Tedim, J; Freire, CSR; Fernandes, SCM; Kallip, S; Lisenkov, A; Gandini, A; Ferreira, MGS
our authors
Aleksey Lisenkov
Junior Researcher
Alessandro Gandini
Researcher
Carmen Sofia da Rocha Freire Barros
Coordinating Researcher
João Tedim
Associate Professor
Mário Guerreiro Silva Ferreira
Retired Professor
Mikhail Zheludkevich
Invited Principal Researcher
Silvar Kallip
Assistant ResearcherGroups
G3 - Electrochemical Materials, Interfaces and Coatings
G4 - Renewable Materials and Circular Economy
acknowledgements
This work was supported by FCT project PTDC/CTM/65632/2006. The FCT grants of J. Tedim and S. Kallip are gratefully acknowledged.