Electrodeposition of Tungsten-molybdenum Alloys from Tungstate-molybdate Melts

摘要

In order to make reasonable selection of systems for tungsten-molybdenum alloy electrodeposition, effects of molybdenum (VI) oxide concentration and cationic composition of melt on cathode product nature and characteristics were studied. Experiments were carried out in Me2WO4- Na2MoO4melts (Me- Li,Na,K and Rb) at 1173 K with cathode current density equal to 5 A/dm2. It was found that, for high MoO3 concentration in melt, the cathodic deposit was molybdenum (VI) oxide instead of metallic molybdenum. The lowest concentration of MoO3 deposition changes from 2.0 to 8.5 mol% as alkaline metal cation radius increases in the following sequence: Li2WO4 < NaWO4