Effect of cerium (IV) ions on the anticorrosion properties of siloxane-poly(methyl methacrylate) based film applied on tin coated steel

Autor(es)

Suegama, P. H. ^[1] ; Sarmento, V. H. V. ^[2] ; Montemor, M. F. ^[3] ; Benedetti, A. V. ^[2] ; de Melo, H. G. ^[1] ; Aoki, I. V. ^[1] ; Santilli, C. V. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Engn Quim, Escola Politecnica, BR-05424970 Sao Paulo - Brazil

^[2] UNESP, Inst Quim, Dept Quim Fis, BR-14801970 Araraquara, SP - Brazil

^[3] Univ Tecn Lisboa, Inst Super Tecn, ICEMS, P-1049001 Lisbon - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 55, n. 18, p. 5100-5109, JUL 15 2010.
• Citações Web of Science: 38

Resumo

This work investigates the influence of the addition of cerium (IV) ions on the anticorrosion properties of organic-inorganic hybrid coatings applied to passivated tin coated steel. In order to evaluate the specific effect of cerium (IV) addition on nanostructural features of the organic and inorganic phases of the hybrid coating, the hydrolytic polycondensation of silicon alkoxide and the radical polymerization of the methyl methacrylate (MMA) function were induced separately. The corrosion resistance of the coatings was evaluated by means of linear polarization, Tafel type curves and electrochemical impedance measurements. The impedance results obtained for the hybrid coatings were discussed based on an electrical equivalent circuit used to fit the experimental data. The electrochemical results clearly showed the improvement of the protective properties of the organic-inorganic hybrid coating mainly when the cerium (IV) was added to the organic phase solution precursor, which seemed to be due to the formation of a more uniform and densely reticulated siloxane-PMMA film. (C) 2010 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/53073-4 - Cerâmicas mesoporosas e hibridos orgânico-inorgânicos multifuncionais preparados pelo processo sol-gel
• Beneficiário: Celso Valentim Santilli
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 05/51851-4 - Nanocompósitos à base de polissilanos aditivados como pré-tratamentos protetores contra corrosão para aço carbono
• Beneficiário: Patricia Hatsue Suegama
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado