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, 471 (1-2). 412-420. ISSN 0925-8388
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(Document in English)
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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 |
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Additional Information: | This publication is available on http://www.sciencedirect.com/science/journal/09258388 |
HAL Id: | hal-03572977 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) |
Laboratory name: | Laboratoire de Génie Chimique - LGC (Toulouse, France) - Procédés électrochimiques (PE) |
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Deposited On: | 02 Jul 2009 20:16 |
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