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Contribution to a better understanding of different behaviour patterns observed with organic coatings evaluated by electrochemical impedance spectroscopy

Macedo, M.C.S.S. and Margarit-Mattos, I.C.P. and Fragata, F.L. and Jorcin, Jean-Baptiste and Pébère, Nadine and Mattos, O.R. Contribution to a better understanding of different behaviour patterns observed with organic coatings evaluated by electrochemical impedance spectroscopy. (2009) Corrosion Science, vol. 51 (n° 6). 1322-1327 . ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2009.03.016

Abstract

In the present paper, three different coatings (epoxy, alkyd, polyurethane paints) were characterized by electrochemical impedance measurements, permeability tests, free-standing film impedance and local impedance measurements. The increase in resistance with immersion time of alkyd paint was linked to the nature of the polymeric network and not to phenomena occurring at the metal/paint interface. For polyurethane paint, local impedance was not able to detect defects in the paint, which was attributed to the fact that the defects are smaller than those observed in alkyd paint and also that they are less active and homogeneously distributed through the coating. Although electrochemical impedance methods (global and local) are excellent tools to monitor the behaviour of organic coatings, these techniques alone are not sufficient to screen different paints.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Corrosion Science website : http://www.sciencedirect.com/science/journal/0010938X
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:?? CEPEL_BR ??
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Universidade Federal do Rio de Janeiro - UFRJ (BRAZIL)
Laboratory name:
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Deposited By:Nihad Lahdifi

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