Localised corrosion assessement of crambe-oil-based polyurethane coatings applied on the ASTM 1200 aluminum alloy

Autor(es)

Nardeli, J. V. ; Snihirova, D. V. ; Fugivara, C. S. ; Montemor, M. F. ; Pinto, E. R. P. ; Messaddecq, Y. ; Benedetti, A. V.

• Tipo de documento: Artigo Científico
• Fonte: Corrosion Science; v. 111, p. 422-435, OCT 2016.
• Citações Web of Science: 4

Resumo

Coatings composed of polyurethanes derived from polyesters of crambe oil and pre-polymer obtained from hexamethylene diisocyanate and castor oil were prepared (1:2 and 1:3, respectively) and applied on the Al alloy 1200. The corrosion resistance of the coated panels was studied by linear polarization and conventional electrochemical impedance (EIS). The fraction of an active area of the substrate was around 0.017% and 0.013% for the 1:2 and 1:3 coatings, respectively. The performance of pristine samples was also studied by electrochemical impedance spectroscopy. An artificial scratch was performed on pristine samples and the local corrosion activity was studied by localized impedance spectroscopy (LEIS) and scanning vibrating electrode technique (SVET) in NaCl solutions. Filiform corrosion was observed for the panel coated with the modified polyester and pre-polymer 1:3 after 12 h of test. The scratched sample of modified polyester and pre-polymer 1:2 showed better performance in NaCl solution and the coating seems to present a self-healing response to the artificial damage. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/22431-0 - Estudo eletroquímico de revestimentos ambientalmente amigáveis para proteção da liga de alumínio ASTM 1200
• Beneficiário: Jéssica Verger Nardeli
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/23060-9 - Estudo do mecanismo de corrosão pelas técnicas de SVET e leis em revestimentos ambientalmente amigáveis aplicados na liga de alumínio ASTM 1200
• Beneficiário: Jéssica Verger Nardeli
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado