A comparative study of epoxy and polyurethane based coatings containing polyaniline-DBSA pigments for corrosion protection on mild steel

A comparative study of epoxy and polyurethane based coatings containing polyaniline-DBSA pigments for corrosion protection on mild steel

Author Diniz, F. B. Google Scholar
De Andrade, G. F. Google Scholar
Martins, C. R. Autor UNIFESP Google Scholar
De Azevedo, W. M. Google Scholar
Institution Universidade Federal de Pernambuco (UFPE)
Universidade Federal de São Paulo (UNIFESP)
Abstract Organic coatings based on epoxy and polyurethane matrices containing polyaniline doped with dodecyl benzene sulfonic acid (Pani-DBSA) were prepared and applied over steel plates (SAE 1020). the plates were submitted to salt spray chamber for up to 30 days in order to evaluate the corrosion protection of these coatings. the properties of the coated plates were analyzed as a function of time by electrochemical impedance spectroscopy, open circuit potential, optical microscopy, and Raman spectroscopy. in general, results indicate a decrease in the electrical resistance, increase in capacitance and decrease in open circuit potential. Epoxy based coatings have improved performance when Pani-DBSA is used as pigment, whereas for the polyurethane coatings, Pani-DBSA seems to play an adverse effect. Raman spectroscopy indicates a possible chlorination of the epoxy matrix after 30 days exposure to salt spray chamber. (C) 2013 Elsevier B.V. All rights reserved.
Keywords Polyaniline
Epoxy
Polyurethane
Raman spectroscopy
Steel
Electrochemical impedance spectroscopy
Language English
Date 2013-05-01
Published in Progress in Organic Coatings. Lausanne: Elsevier Science Sa, v. 76, n. 5, p. 912-916, 2013.
ISSN 0300-9440 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 912-916
Origin http://dx.doi.org/10.1016/j.porgcoat.2013.02.010
Access rights Closed access
Type Review
Web of Science ID WOS:000318136200016
URI http://repositorio.unifesp.br/handle/11600/36299

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