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

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.
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Corrosion Science, Elsevier, 2014, vol. 79, pp. 159-168. 〈10.1016/j.corsci.2013.10.040〉
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Magaly Oudot, Laurent Cassayre, Pierre Chamelot, Mathieu Gibilaro, Laurent Massot, et al.. Layer growth mechanisms on metallic electrodes under anodic polarization in cryolite-alumina melt. Corrosion Science, Elsevier, 2014, vol. 79, pp. 159-168. 〈10.1016/j.corsci.2013.10.040〉. 〈hal-00948663〉

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