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Delaminated areas beneath organic coating: A local electrochemical impedance approach

Jorcin, Jean-Baptiste and Aragon, Emmanuel and Merlatti, Céline and Pébère, Nadine Delaminated areas beneath organic coating: A local electrochemical impedance approach. (2006) Corrosion Science, 4 (7). 1779-1790 . ISSN 0010-938X

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.corsci.2005.05.031


Local electrochemical impedance mapping was used to investigate delamination phenomena at the steel/epoxy-vinyl primer interface. The delamination occurred from an artificial defect(cutter scribing) and from ageing in a salt spray chamber. The samples were taken from the salt spray chamber after 20, 30 and 50 days of exposure. To observe delamination after ageing, the corrosion product layers were removed by a cathodic polarization at −1.5 V/SCE for 4 h. A non-aged reference sample was tested for comparison. Mapping was performed at 5 kHz. Initiation and propagation of the delamination were clearly observed. The delaminated surface areas measured by visual observations after the removal of the coating were lower than those determined by local electrochemical impedance mapping. The delamination mechanisms were discussed with reference to literature data.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWS-4H27C8R-5&_user=4373306&_coverDate=07%2F31%2F2006&_alid=790791629&_rdoc=1&_fmt=high&_orig=search&_cdi=5570&_docanchor=&view=c&_ct=1&_acct=C000043979&_version=1&_urlVersion=0&_userid=4373306&md5=7cc96b5be5a3554a55f912aa08ddc1c5 Corrosion Science website : http://www.elsevier.com/wps/find/journaldescription.cws_home/260/description#description
HAL Id:hal-03599487
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Université du Sud Toulon-Var - USTV (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Laboratory name:
Deposited On:15 Sep 2008 14:44

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