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Impedance study of the influence of chromates on the properties of waterborne coatings deposited on 2024 aluminium alloy

Nguyen, Anh Son and Musiani, Marco and Orazem, Mark E. and Pébère, Nadine and Tribollet, Bernard and Vivier, Vincent Impedance study of the influence of chromates on the properties of waterborne coatings deposited on 2024 aluminium alloy. (2016) Corrosion Science, 109. 174-181. ISSN 0010-938X

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Official URL: https://doi.org/10.1016/j.corsci.2016.03.030

Abstract

Coatings formulated with either SrCrO4 or a mixture of Cr(VI)-free pigments were compared in an impedance study. In addition to classical EIS measurements carried out in the metal/coating/electrolyte configuration, the study involved measurement of the impedance of the coatings in the dry state, both before exposure to the electrolyte (0.5M NaCl solution) and after a 1-month exposure followed by a 12-month drying. The results were analysed with reference to models that assumed resistivity variations along the coating thickness. The resistivity-position dependence was close to a power law for dry coatings and close to exponential for wet coatings. In the latter, and for short immersion times, the exponential variation was located in the outer coating region, at shorter distances from the coating/solution interface, and then, for longer immersion times (>1 week), extended to the whole coating thickness. The effect of SrCrO4 leaching on the properties of the coating is discussed. For both coatings, the barrier effect remained high for a 1-month exposure.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Consiglio Nazionale delle Ricerche - CNR (ITALY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Sorbonne Université (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Florida (USA)
Laboratory name:
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Deposited By: Yves MOMBOISSE
Deposited On:19 Dec 2019 12:38

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