resumo
Chitosan-based coatings were suggested in this work as a "green" alternative for active corrosion protection of aluminum alloys. 2-Mercaptobenzothiazole (MBT) was used here as an efficient corrosion inhibitor for AA2024. The electrochemical impedance spectroscopy has demonstrated a strong inhibiting action of MBT showing no corrosion attack even after one week in full immersion tests when MBT-loaded chitosan coatings are applied. The surface properties of the chitosan coatings were improved by chemical grafting with poly(ethylene-alt-maleic anhydride) (PEMA) and poly(maleic anhydride-alt-1-octadecene) (POMA), aiming at increasing hydrophobicity that is crucial for corrosion protection in atmospheric conditions. The high contact angles, in the range of 140 degrees, were obtained on the MBT-containing chitosan films. (c) 2013 Elsevier B.V. All rights reserved.
palavras-chave
ALUMINUM-ALLOY; DRUG-DELIVERY; 2-MERCAPTOBENZOTHIAZOLE; INHIBITORS; SURFACES
categoria
Materials Science; Physics
autores
Carneiro, J; Tedim, J; Fernandes, SCM; Freire, CSR; Gandini, A; Ferreira, MGS; Zheludkevich, ML
nossos autores
Alessandro Gandini
Investigador
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
João Tedim
Professor associado
Jorge Augusto Oliveira Carneiro
Bolseiro de pós-Doutoramento
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal ConvidadoGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
agradecimentos
The authors gratefully acknowledge the financial support of CICECO (Financiamento Programatico da UI 89 CICECO). JT thanks FCT for post-doctoral grant (ref. SFRH/BPD/64335/2009).