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The process of electrochemical dissolution of pure Mo, Re and Ru metals, as well as their alloys 52.5 at. Mo – 47.5 at. Re and 90 at. Mo – 10 at. Ru in 0.5-6.0M HNO 3  was studied using the linear voltammetry technique. The dissolution potentials of the pure metals were found to increase from 0.39 to 0.48V/SCE (Mo), from 0.7 to 0.81V/SCE (Re) and from 1.15 to 1.25V/SCE (Ru) with the augmentation of HNO 3  concentration in the electrolyte. The dissolution potentials of the alloys 52.5 at. Mo + 47.5 at. Re and 90 at. Mo + 10 at. Ru were found to change from 0.49 to 0.58 (Mo-Re) and from 0.92 to 1.09 (Mo-Ru) when HNO 3  concentration in the electrolyte increased from 0.5 to 6.0M. The secondary passivation of Mo-containing electrodes was observed in the solutions 2.0-6.0M HNO 3  at the potentials from 1.4 to 1.9V/SCE, decreasing their dissolution rate in this range of potentials. The maximum electrochemical dissolution rate constants of pure Mo, Re, Ru metals and Mo-Re, Mo-Ru alloys have been estimated using the data of linear voltammetry. The obtained values (1.85-2.20g/cm 2  h for Mo-Re and 0.58-0.64g/cm 2  h for Mo-Ru alloys electrochemical dissolution) are found to be thousand times greater, than reported for the process of chemical dissolution of corresponding alloys in boiling HNO 3 .

radiochimica acta

Electrochemical dissolution of simulated "white inclusions" in nitric acid. Linear voltammetry study with Mo, Re, Ru metals and their alloys electrodes