Electrodeposition of metal molybdenum from electrolytes containing hydrofluoric acid

Electroreduction of Molybdate Ions in the Presence of Hydrofluoric Acid

“…These data, along with the results of a microscopic study, suggest that each portion characterizes the formation of molybdenum oxide compounds with intermediate degrees of reduction, in which the average degree of oxidation of molybdenum decreases with increasing current density [3]. Colored films are formed on the cathode at a current density of 0.253 2.5 A dm !2 , dark deposits, at 2.5315 A dm !2 , and black deposits, at current densities exceeding 25 A dm !2 .…”

“…It has been confirmed once again most recently that the refinement of the existing electrolytes and creation of new efficient ones is a necessary and topical task both for synthesis of nonstoichiometric molybdenum oxide compounds [1,2] and for deposition of metallic molybdenum coatings [3] that would satisfy current ecological requirements.…”

Investigation of the Electrochemical Reduction Process of the Molybdate Ions in the Tartaric Electrolytes

“…The effect of hydrogen fluoride on the cathodic reduction of molybdate ions has been investigated. 16 It was indicated that the mechanism of the process is controlled by its concentration. It was found that at concentration values less than 25 g/L, the products of the electroreduction process of the molybdate ions are black or colorful precipitations.…”

Studying the electrochemical deposition process of molybdenum from aqueous solution of molybdate ions

“…The electroreduction process of molybdenum ions to molybdenum on the cathode from different solutions were investigated by a number of researchers and the obtained results are different depending on the composition of the solution and the terms of the electrolysis process [9][10][11][12]. There is no sufficient information in the previous works about the kinetics and the mechanism of the electroreduction and the electrodeposition processes of the molybdate ions to molybdenum metal.…”