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On the formation of U-Al alloys in the molten LiCl-KCl eutectic

Cassayre, Laurent and Caravaca, Concepción and Jardin, Régis and Malmbeck, Rikard and Masset, Patrick and Mendes, Eric and Serp, Jérôme and Soucek, Pavel and Glatz, Jean-Paul On the formation of U-Al alloys in the molten LiCl-KCl eutectic. (2008) Journal of Nuclear Materials, vol. 378 (n° 1). pp. 79-85. ISSN 0022-3115

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Official URL: http://dx.doi.org/10.1016/j.jnucmat.2008.05.004

Abstract

U-Al alloy formation has been studied in the temperature range of 400 – 550 °C by electrochemical techniques in the molten LiCl-KCl eutectic. Cyclic voltammetry showed that underpotential reduction of U(III) onto solid Al occurs at a potential about 0.35 V more anodic than pure U deposition. Open circuit potential measurements, recorded after small depositions of U metal onto the Al electrode, did not allow the distinction between potentials associated with UAlx alloys and the Al rest potential, as they were found to be practically identical. As a consequence, a spontaneous chemical reaction between dissolved UCl3 and Al is thermodynamically possible and was experimentally observed. Galvanostatic electrolyses were carried out both on Al rods and Al plates. Stable and dense U-Al deposits were obtained with high faradic yields, and the possibility to load the whole bulk of a thin Al plate was demonstrated. The analyses (by SEM-EDX and XRD) of the deposits indicated the formation of different intermetallic phases (UAl2, UAl3 and UAl4) depending on the experimental conditions.

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 Journal of Nuclear Materials website : http://www.sciencedirect.com/science/journal/00223115
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 > Institute for Transuranium Elements - ITU (GERMANY)
Other partners > Centro de Investigaciones Energéticas Medioambientales y Tecnológicas - CIEMAT (SPAIN)
Laboratory name:
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Deposited By: Hélène Dubernard

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