Positron Annihilation Spectroscopy and Electrochemical Impedance Spectroscopy Studies of Polyurethane-Urea Hybrid Coatings

Autor(es)

Lopes de Oliveira, Mara Cristina ^[1] ; Antunes, Renato Altobelli ^[2] ; Costa, Isolda ^[3]

Afiliação do(s) autor(es)

^[1] Technol Entrepreneurship & Innovat Ctr CIETEC, Electrocell Ind Com Equip Elet LTDA, BR-05508000 Sao Paulo - Brazil

^[2] Fed Univ ABC UFABC, Engn Modeling & Appl Social Sci Ctr CECS, BR-09210170 Santo Andre, SP - Brazil

^[3] IPEN CNEN SP, BR-05508000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 8, n. 6, p. 7656-7668, JUN 2013.
• Citações Web of Science: 1

Resumo

The aim of this work was to study the physical aging behavior and corrosion resistance of polyurethane-urea hybrid coatings by positron annihilation spectroscopy and electrochemical impedance spectroscopy (EIS). Two coatings with different NCO/OH ratios have been prepared using the pre-polymer method. The coatings structure was characterized by Fourier transform-infrared spectroscopy. Differential scanning calorimetry (DSC) was used as a complimentary technique to evaluate the physical aging behavior of the coatings. The results showed that the coatings were only little affected by physical aging and presented high corrosion resistance. However, the coating with the highest NCO/OH presented the best general performance. The results obtained by positron annihilation spectroscopy and EIS were in good agreement, suggesting that there is a direct relationship between the physical aging and corrosion behavior of the coatings prepared in this work. (AU)

• Processo FAPESP: 04/08893-5 - Desenvolvimento de um revestimento orgânico anticorrosivo baseado em sistema poliuretano-uréia para uso em aplicações marítimas
• Beneficiário: Renato Altobelli Antunes
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisa Inovativa em Pequenas Empresas - PIPE