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Electrochemical preparation of aluminium-nickel alloys by Under-Potential Deposition in molten fluorides

Gibilaro, Mathieu and Massot, Laurent and Chamelot, Pierre and Taxil, Pierre Electrochemical preparation of aluminium-nickel alloys by Under-Potential Deposition in molten fluorides. (2009) Journal of Alloys and Compounds, vol. 471 (n°1-2). pp. 412-420. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2008.03.115

Abstract

The electrochemical behaviour of AlF3 was investigated in LiF-CaF2 medium first with inert tungsten and then with reactive nickel electrodes. Cyclic voltammetry, square wave voltammetry and chronopotentiometry indicated that the reduction of Al(III) in Al(0) is a single-step process exchanging 3 electrons: Al(III) + 3e- = Al. The electrochemical reduction is controlled by the diffusion of AlF3 in the solution. On a nickel electrode, a depolarisation effect for Al(III) reduction was observed in cyclic voltammetry due to the formation of Al-Ni alloys when aluminium ions react with the nickel substrate. Galvanostatic and potentiostatic electrolyses on a nickel electrode led to the formation of four nickel aluminides characterised by SEM: AlNi3, AlNi, Al3Ni2 and Al3Ni. Layers with a uniform composition of AlNi3, AlNi and Al3Ni2 were prepared by varying the electrolysis potential, the current density and duration of intermetallic diffusion.

Item Type:Article
Additional Information:This publication is available on http://www.sciencedirect.com/science/journal/09258388
Audience (journal):International journal (no peer-reviewed)
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
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Deposited By: Laurent CASSAYRE

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