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Electrochemical oxidation of binary copper-nickel alloys in cryolite melts

Cassayre, Laurent and Chamelot, Pierre and Arurault, Laurent and Massot, Laurent and Palau, Patrice and Taxil, Pierre Electrochemical oxidation of binary copper-nickel alloys in cryolite melts. (2007) Corrosion Science, vol. 49 (n° 9). pp. 3610-3625. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2007.03.020

Abstract

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.

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
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Rio Tinto Alcan (FRANCE)
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Deposited By:Hélène Dubernard

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