Issue 13, 2011

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

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.

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

Article information

Article type
Paper
Submitted
20 Jan 2011
Accepted
28 Jan 2011
First published
23 Feb 2011

J. Mater. Chem., 2011,21, 4805-4812

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

M. L. Zheludkevich, J. Tedim, C. S. R. Freire, S. C. M. Fernandes, S. Kallip, A. Lisenkov, A. Gandini and M. G. S. Ferreira, J. Mater. Chem., 2011, 21, 4805 DOI: 10.1039/C1JM10304K

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