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

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. T...

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Bibliographic Details
Published in:Journal of materials chemistry 2011-01, Vol.21 (13), p.4805-4812
Main Authors: Zheludkevich, M. L., Tedim, J., Freire, C. S. R., Fernandes, S. C. M., Kallip, S., Lisenkov, A., Gandini, A., Ferreira, M. G. S.
Format: Article
Language:English
Subjects:
Aluminum base alloys
Cerium
Chemical Sciences
Chitosan
Coating
Corrosion inhibitors
Corrosion prevention
Polymers
Protective coatings
Reservoirs
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Summary: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.
ISSN:0959-9428
1364-5501
DOI:10.1039/c1jm10304k