Utilize este identificador para referenciar este registo: http://hdl.handle.net/10773/9006
Título: Chitosan-based self-healing protective coatings doped with cerium nitrate for corrosion protection of aluminum alloy 2024
Autor: Carneiro, J.
Tedim, J.
Fernandes, S. C. M.
Freire, C. S. R.
Silvestre, A. J. D.
Gandini, A.
Ferreira, M. G. S.
Zheludkevich, M. L.
Palavras-chave: Cerium (III)
Chitosan
Corrosion protection
Self-healing
AA2024
Data: 2012
Editora: Elsevier
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10773/9006
DOI: 10.1016/j.porgcoat.2012.02.012
ISSN: 0300-9440
Aparece nas coleções: CICECO - Artigos

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Progress in Organic Coatings 75 (2012) 8– 13.pdf913.12 kBAdobe PDFrestrictedAccess


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