Changes in electrochemical properties of a heavy tungsten alloy during its processing under the influence of DC current in ammonia-alkali solutions

Kuznetsova, O. G.; Levin, A. M.; Sevostyanov, M. A.; Tsybin, O. I.; Bol’shikh, A. O.

doi:10.1088/1757-899x/848/1/012045

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…At the same time, a very high passivity of the VNZh90 superalloy (90 % W, 5 % Ni, 5 % Fe) was revealed. The high passivity of this alloy was confirmed during anodic oxidation in alkaline-ammonium solutions [49,50] both at constant [51] and alternating current [52]. However, to confirm the possibility of using the VNZh90 alloy as a universal anode-cathode material of a reverse electrodialyzer, it is necessary to additionally study the anodic behavior of this alloy in the corresponding solutions.…”

Section: Literature Review and Problem Statementmentioning

confidence: 96%

Determination of the applicability of the tungsten-containing material as low-cost electrodes for reverse electrodialysis

Кovalenko

Kotok

2021

EEJET

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Electrodialysis, especially reverse, is a promising method of water desalination, concentration of solutions, extraction of valuable components from waste and rinse water, and power generation. The main problem is the search for low-cost universal anode-cathode materials. The work aims to determine the possibility of using the VNZh90 superalloy (5 % Ni, 5 % Fe, 90 % W) and the electroplated Ni-W alloy as a universal cathode-anode material for reverse electrodialysis. The crystal structure of the Ni-W alloy was studied by X-ray diffraction analysis; the morphology was studied by scanning electron microscopy. The anodic behavior of both alloys was studied by voltammetry in 6 % HCl in a saturated NaCl solution. The high passivity of the VNZh90 superalloy was revealed. On the repeated anodic curve, the current density of the passivation plateau decreased 2.8 times and was 37 mA/dm2. This indicates that the use of the VNZh90 superalloy is promising as a universal cathode-anode material of a reverse electrodialyzer. The phenomenon of significant passivation for the Ni-W alloy was also revealed. The primary curve of the alloy showed two dissolution peaks and a well-defined passivation plateau. Probably, the first peak corresponded to a more active phase with a low W content. This was confirmed by the absence of the first peak on the repeated anodic curve and the identity of the passivation plateaus of the primary and repeated curves. The passivation current density was 209 mA/dm2. These data also indicate the possibility and prospects of using the electroplated Ni-W alloy as a universal cathode-anode material of a reverse electrodialyzer after optimizing the composition and deposition method of the alloy, as well as reducing the wear rate.

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Section: Literature Review and Problem Statementmentioning

confidence: 96%

Determination of the applicability of the tungsten-containing material as low-cost electrodes for reverse electrodialysis

Кovalenko

Kotok

2021

EEJET

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“…Традиционная пирометаллургическая переработка сплавов на основе вольфрама малопригодна к ренийсодержащим материалам из-за потерь чрезвычайно ценного рения [9], в связи с чем создание технологических схем переработки ренийсодержащих вольфрамовых сплавов, основанных на гидрометаллургических процессах, в полной мере отвечает целям увеличения эффективности рециклирования ценных компонентов и повышения экологической безопасности производства. Применительно к трудноизмельчаемым вольфрам-рениевым сплавам целесообразно использовать электрохимические методы, отличающиеся универсальностью, связанной с возможностью перерабатывать техногенные отходы вне зависимости от их формы и крупности [3,10].…”

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“…Близкие закономерности наблюдались и для индивидуального вольфрама [9], однако, в отличие от последнего, присутствие рения в сплаве вызывает протекание пассивационных процессов при дальнейшем смещении потенциала электрода в электроположительную область, а также появление второго максимума в интервале потенциалов +0,5…+0,6 В.…”

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Electrochemical processing of rhenium-containing tungsten alloys waste in ammonia-carbonate solutions

Kuznetsova,

Levin,

Sevostyanov

et al. 2023

TKSC RAS

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The electrochemical behavior of rhenium-containing tungsten alloys waste of the type WRe (wt. %: W — 80–95, Re — 5–20) in a solution of (NH4)2CO3 1,0 M was studied using the method of linear voltammetry in potentiodynamic mode and potentiostatic electrolysis. Separation of tungsten and rhenium from the resulting electrolyte was carried out by crystallization of ammonium paratungstate and concentration of rhenium in the mother liquor. A basic technological scheme for the processing of rhenium-containing tungsten alloys is proposed.

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Electrochemical processing of heavy tungsten alloy wastes for obtaining a microdispersed iron-nickel base powder by using alternating current

Kuznetsova

Levin

Sevostyanov

et al. 2021

J. Phys.: Conf. Ser.

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Electrochemical processing of heavy tungsten alloy wastes (wt.%: W 78,8, Ni 15,2, Fe 6,0) under the cyclic using of direct and alternating current in ammonia-alkaline solutions has been investigated. High dissolution rate of alloy wastes, as well as degree of tungsten extraction, has been provided. The electrochemical process has been accompanied by production of microdispersed iron-nickel powder, that contains up to 2 wt.% tungsten.

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Changes in electrochemical properties of a heavy tungsten alloy during its processing under the influence of DC current in ammonia-alkali solutions

Cited by 4 publications

References 8 publications

Determination of the applicability of the tungsten-containing material as low-cost electrodes for reverse electrodialysis

Determination of the applicability of the tungsten-containing material as low-cost electrodes for reverse electrodialysis

Electrochemical processing of rhenium-containing tungsten alloys waste in ammonia-carbonate solutions

Electrochemical processing of heavy tungsten alloy wastes for obtaining a microdispersed iron-nickel base powder by using alternating current

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