Study of the mechanism of joint electroreduction of Dy3+ and Co2+ ions in the eutectic KCl-NaCl-CsCl melt at 823 K

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The kinetic patterns of the electroreduction of the Co2+ ion in the eutectic melt KCl-NaCl-CsCl at 823 K have been determined. It has been established that the release potentials of metallic cobalt and dysprosium on an inert tungsten electrode in the molten KCl-NaCl-CsCl system differ by approximately 1.5 V. It has been shown that with the combined content of Co2+ and Dy3+ ions in the eutectic KCl-NaCl-CsCl melt, a certain depolarization of the electroreduction of dysprosium ions takes place on the metal cobalt pre-precipitated on the tungsten electrode with the formation of intermetallic phases of different compositions based on cobalt and dysprosium. The dissolution potentials of DyxCoy intermetallic phases of different compositions were determined using switch-off chronopotentiometry.