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Article Dans Une Revue Corrosion Science Année : 2007

Electrochemical oxidation of binary copper-nickel alloys in cryolite melts

Résumé

Anodic oxidation of copper, nickel and two copper-nickel alloys was studied in cryolite melts at 1000°C. In an oxide-free melt, anodic dissolution of each material was observed, and the dissolution potential increases with the content of copper. SEM characterization of a Cu55-Ni45 alloy showed that nickel is selectively dissolved according to a de-alloying process. In an alumina-containing melt, a partial passivation occurs at the copper-containing electrodes, at potentials below the oxygen evolution potential. A passive film forms on the copper electrode, while on the nickel electrode no dense oxide layer develops. Copper-nickel alloys were found to form a mixed oxide layer. At higher potentials, the formation of oxygen bubbles on the electrodes results in a degradation of the passive films and a strong corrosion.
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hal-03594305 , version 1 (22-06-2023)

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Laurent Cassayre, Pierre Chamelot, Laurent Arurault, Laurent Massot, Patrice Palau, et al.. Electrochemical oxidation of binary copper-nickel alloys in cryolite melts. Corrosion Science, 2007, vol. 49 (n° 9), pp.3610-3625. ⟨10.1016/j.corsci.2007.03.020⟩. ⟨hal-03594305⟩
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