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Layer growth mechanisms on metallic electrodes under anodic polarization in cryolite-alumina melt

Oudot, Magaly and Cassayre, Laurent and Chamelot, Pierre and Gibilaro, Mathieu and Massot, Laurent and Pijolat, Michèle and Bouvet, Sylvie Layer growth mechanisms on metallic electrodes under anodic polarization in cryolite-alumina melt. (2014) Corrosion Science, vol. 79. pp. 159-168. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2013.10.040

Abstract

The anodic behavior of Fe, Ni, Co electrodes was investigated in a cryolite-alumina melt at 960 °C, by electrochemical techniques, microstructural characterizations and thermodynamic calculations, to provide a fundamental understanding of layers formation at metal (M) electrode surface. At low overpotential, anodic dissolution of M occurs; when the Mn+ concentration at the surface reaches saturation, a MxAl3-xO4 spinel phase precipitates. Then, a dense MyO layer grows at the metal/spinel interface. As for Fe, polarization at higher overpotentials lead to the same layers of spinel and monoxide, but pores at the metal/FeyO interface cause loss of adhesion of the oxide film.

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
HAL Id:hal-00948663
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Rio Tinto Alcan (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure des Mines de Saint-Etienne - ENSMSE (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Laurent CASSAYRE
Deposited On:18 Feb 2014 14:53

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