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Article Dans Une Revue Corrosion Science Année : 2016

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

Résumé

Coatings formulated with either SrCrO4or a mixture of Cr(VI)-free pigments were compared in animpedance study. In addition to classical EIS measurements carried out in the metal/coating/electrolyteconfiguration, the study involved measurement of the impedance of the coatings in the dry state, bothbefore exposure to the electrolyte (0.5 M NaCl solution) and after a 1-month exposure followed by a12-month drying. The results were analysed with reference to models that assumed resistivity varia-tions along the coating thickness. The resistivity-position dependence was close to a power law for drycoatings and close to exponential for wet coatings. In the latter, and for short immersion times, the expo-nential variation was located in the outer coating region, at shorter distances from the coating/solutioninterface, and then, for longer immersion times (>1 week), extended to the whole coating thickness. Theeffect of SrCrO4leaching on the properties of the coating is discussed. For both coatings, the barrier effectremained high for a 1-month exposure.

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Chimie Autre
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Dates et versions

hal-01334885 , version 1 (20-07-2016)

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Anh Son Nguyen, Marco Musiani, Mark E. Orazem, Nadine Pébère, Bernard Tribollet, et al.. Impedance study of the influence of chromates on the properties of waterborne coatings deposited on 2024 aluminium alloy. Corrosion Science, 2016, 109, pp.174-181. ⟨10.1016/j.corsci.2016.03.030⟩. ⟨hal-01334885⟩
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