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The Effect of Electrolyte Composition on the Electrodeposition of Molybdenum from KF—B203—K2Mo04 Melts. 1. Chronopotentiometry

M. Makyta, T. A. Utigard, P. Zatko, A. Silný, and V. Daněk

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava


Abstract: Chronopotentiometric experiments have been carried out to determine the effect of the electrolyte composition on the mechanism of electrodeposition of molybdenum from molten KF-B2O3-K2MoO4 salts. During the dissolution of potassium molybdate in the KF-B2O3 electrolyte, two types of molybdenum-containing species, electrochemically active and electrochemically inactive, are created. The electrochemically active molybdenum compound is created by a chemical reaction with boron containing constituents in the melt. Electrochemically inactive molybdenum species are created by the reaction of K2MoO4 with fluoride anions. A chemical reaction between these two species was found to precede the one-step charge-transfer reduction of Mo(VI). The diffusion coefficient of the electrochemically active molybdenum compound was determined to be 2.8 x 10-9 m2 s-1.

Full paper in Portable Document Format: 514a202.pdf


Chemical Papers 51 (4) 202–207 (1997)

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