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Article Dans Une Revue Journal of Nuclear Materials Année : 2008

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

Résumé

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.

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Génie chimique
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Dates et versions

hal-03580134 , version 1 (18-02-2022)

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Laurent Cassayre, Concepción Caravaca, Régis Jardin, Rikard Malmbeck, Patrick Masset, et al.. On the formation of U-Al alloys in the molten LiCl-KCl eutectic. Journal of Nuclear Materials, 2008, 378 (1), pp.79-85. ⟨10.1016/j.jnucmat.2008.05.004⟩. ⟨hal-03580134⟩
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