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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Author(s):
Lopes de Oliveira, Mara Cristina [1] ; Antunes, Renato Altobelli [2] ; Costa, Isolda [3]
Total Authors: 3
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: International Journal of Electrochemical Science; v. 8, n. 6, p. 7656-7668, JUN 2013.
Web of Science Citations: 1
Abstract

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)