Chitosan-based self-healing protective coatings doped with cerium nitrate for corrosion protection of aluminum alloy 2024
authors Carneiro, J; Tedim, J; Fernandes, SCM; Freire, CSR; Silvestre, AJD; Gandini, A; Ferreira, MGS; Zheludkevich, ML
nationality International
author keywords Cerium (III); Chitosan; Corrosion protection; Self-healing; AA2024
abstract The good film forming ability, specific solubility and versatile chemical functionalization of chitosan make it a promising candidate for "green" protective coatings. In the present work, these features are exploited together with chitosan high complexing ability to obtain inhibitor-containing anticorrosion coatings for active protection of aluminum alloys. The functionalization of chitosan with fluorinated substituents was also evaluated as a possible route to improve barrier and surface properties of the coating matrix. It was observed that the chitosan layer worked as a reservoir for cationic Ce3+ corrosion inhibitor due to the complexation of Ce3+ with chitosan amino groups, which prevents its uncontrollable and fast leaching. These Ce-containing coatings were found to confer active corrosion protection toward aluminum alloy 2024 as shown by electrochemical impedance spectroscopy. Moreover, the corrosion tests evidence the self-healing ability of prepared chitosan-based "green" protective coatings. The interaction between Ce3+ and chitosan and the concentration effect of the former on the performance of the latter from a corrosion standpoint is also discussed. (C) 2012 Elsevier B.V. All rights reserved.
issn 0300-9440
year published 2012
volume 75
issue 1-2
beginning page 8
ending page 13
digital object identifier (doi) 10.1016/j.porgcoat.2012.02.012
web of science category Chemistry, Applied; Materials Science, Coatings & Films
subject category Chemistry; Materials Science
unique article identifier WOS:000305878300002
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