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Article
Electrical Conductivity of Rhenium-Containing Ammonium Carbonate Solutions and the Calculation of Its Activation Energy
The conductometric method is used to study the dependences of the electrical conductivity (EC) of aqueous solutions of ammonium carbonate and solutions of the ammonium carbonate–ammonium perrhenate system on t...
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Article
Electrochemical recovery of rhenium from W–Re alloys in the form of perrhenic acid: I. Fundamentals of the process
Linear voltammetry is used to study the anodic behavior of a VR20 alloy in sodium hydroxide solutions, and the possibility of high-rate dc electrochemical dissolution of this alloy is shown. Experimental depen...
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Article
Comparative analysis of the reactivity of nickel and a Ni–Re (10 wt %) alloy during direct current polarization in sulfuric acid solutions
A comparative analysis of the reactivity of nickel and its alloy with rhenium during their direct current polarization in sulfuric acid solutions (50–150 g/L, 25–60°C) is carried out. The regions of anodic pot...
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Article
Effect the tungsten(VI) and molybdenum(VI) ions on the electrical conductivity of ammonium hydroxide solutions
The effect of the W(VI) and Mo(VI) ions on the electrical conductivity of ammonium hydroxide solutions (7 mol/L) is studied in the tungsten or molybdenum concentration range 0.1–0.5 mol/L and the temperature r...
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Article
Reaction behavior of Ni–Re alloys during direct current polarization in sulfuric acid solutions
The macrokinetic regularities of the reactivity of synthesized Ni–Re (20 and 60 wt %) alloys in a sulfuric acid solution (100 g/L, 25–40°C) during direct current polarization are studied using physicochemical ...
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Article
Effect of a dc magnetic field on the electrical conductivity of ammonia solutions containing tungsten(VI) and rhenium(VII) ions
The effect of a dc magnetic field (60–120 mT) on the electrical conductivities of ammonia solutions containing the W(VI) and Re(VII) ions in the course of magnetic processing for 24–48 h is studied. Magnetic p...
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Article
Electrical conductivity of ammonia solutions containing rhenium(VII)
The electrical conductivity of rhenium-containing ammonia solutions is studied by mathematical planning of experiment (rotatable second-order plan). It is shown that the conductivity of the solutions increases...
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Article
Combined electrochemical processing of the wastes of nickel superalloys containing rhenium, tungsten, tantalum, niobium, and other precious metals
Electrochemical anodic oxidation of nickel superalloy ZhS32 under the action of a direct current in an acid solution H2SO4 + HCl has been studied to reveal its efficiency for combined processing of the wastes of ...
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Article
Electrochemical processing of the metallic wastes of ZhS32 nickel superalloys
Technological foundations are developed for the electrochemical oxidation of nickel superalloys containing alloying elements Re, Ta, Nb, Co, W, Cr, Mo, and Al. It is shown that nickel, cobalt, and aluminum pas...
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Article
Electrochemical oxidation of the carbide wastes of hard alloys using alternating current
The electrochemical oxidation of the carbide wastes of a W-Co alloy has been studied by gas, electron-probe microanalysis, and X-ray diffraction analyses. The experiments are carried out using halfwave sinusoi...
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Article
Complex electrochemical processing of the metallic wastes from a rhenium-containing nickel superalloy in sulfuric acid electrolytes
A principal technological scheme for the complex electrochemical processing of the wastes from a rhenium-containing nickel superalloy in sulfuric acid electrolytes is developed on the basis of physicochemical ...
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Article
Effect of temperature on the corrosion of some materials in perrhenic acid solutions
Corrosion of some metallic and nonmetallic materials (nickel, copper, iron, glass) in solutions of perrhenic acid HReO4 (∼345 g/l) is studied in the temperature range 15–30°C. It is demonstrated that this process...
