Article Dans Une Revue Materials Sciences and Applications Année : 2019

Electrochemical Degradation Mechanism of a Cermet Anode for Aluminum Production

Laurent Massot
Mathieu Gibilaro
S. Bouvet
  • Fonction : Auteur
V. Laurent
  • Fonction : Auteur
A. Marmottant
  • Fonction : Auteur
P. Chamelot
  • Fonction : Auteur
  • PersonId : 1481479
  • IdRef : 091642744

Résumé

Tests on (NixFeyO4 - Ni1?xFexO)/(CuxNiyFez) cermets, considered as promising anode for the aluminium production, were performed under electrolysis at 0.8 A·cm-2 in molten mixture of cryolite at 960°C. In order to predict phase compositions, a thermodynamic study was performed and experimentally verified by SEM-EDS analysis. The metallic phase oxidation leads to the formation of different phases such as FeF2, Ni0.90Fe0.10O, NiF2 and Cu2O phases, while NixFe3-xO4 spinel is continuously enriched up to x = 0.90, the thermodynamically stable nickel composition. When the cermet material is fully oxidized, metallic and oxide phases are converted into soluble or non-conductive phases, leading to the end of anode service life.

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hal-04142894 , version 1 (05-07-2023)

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P. Meyer, Laurent Massot, Mathieu Gibilaro, S. Bouvet, V. Laurent, et al.. Electrochemical Degradation Mechanism of a Cermet Anode for Aluminum Production. Materials Sciences and Applications, 2019, 10 (09), pp.614-629. ⟨10.4236/msa.2019.109044⟩. ⟨hal-04142894⟩
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