Rhenium Electrodeposition and Its Electrochemical Behavior in Molten KF-KBF4-B2O3-KReO4

Chernyshev, Aleksandr; Arkhipov, Stepan P.; Аписаров, А. П.; Shmygalev, Aleksander S.; Исаков, А. А.; Zaikov, Yury P.

doi:10.3390/ma15238679

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…This fact is probably related to the crystallization area of the volatile Re 2 O 7 and the more refractory K 3 ReO 5 compound. The presence of rhenium compounds in the Re +7 oxidation state in the K 2 B 2 OF 6 -KReO 4 melts is in agreement with the results reported in [32]. Presumably, the following reaction related to the release of rhenium oxide takes place in the melts:…”

Section: Resultssupporting

confidence: 91%

Melting Behavior and Densities of K2B2OF6 Melts Containing KReO4

Chernyshev,

Apisarov,

Isakov

et al. 2023

Processes

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Methods of simultaneous thermal analysis (differential scanning calorimetry, thermogravimetry) and an analysis of cooling curves were used to study the melting of K2B2OF6–(0–15 wt. %) KReO4 melts. The synthesis of K2B2OF6 was performed by alloying KF, KBF4, and B2O3 components. The liquidus temperature dependence on the content of potassium perrhenate in the K2B2OF6–(0–15 wt. %) KReO4 melts was determined. It was found that the addition of up to 6 wt. % KReO4 caused an increase in the melt liquidus temperature to 733 K. Further increases in potassium perrhenate did not change the temperature of the primary crystallization (733 ± 5 K) of the K2B2OF6–KReO4 melt. This fact testifies to the presence of the monotectic reaction. It was found that the relative loss of mass of the K2B2OF6–(0–15 wt. %) KReO4 melts did not exceed 2.1%. The delamination of the K2B2OF6–KReO4 melt was revealed according to the values of the primary crystallization temperatures (liquidus temperatures) in different layers of the melt. The density of the K2B2OF6–KReO4 melts as a function of potassium perrhenate content (0–15 wt. %) was investigated at 628–933 K. The temperature dependence of the K2B2OF6–KReO4 melts’ densities was recorded. They are presented as linear functions. The curves of the density temperature dependence of the K2B2OF6–KReO4 melts were used to determine the critical temperatures, i.e., the boundaries of the miscibility gap. The miscibility gap of the K2B2OF6–KReO4 melts is limited to 1 wt. % and 15 wt. % KReO4 content.

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Section: Resultssupporting

confidence: 91%

Melting Behavior and Densities of K2B2OF6 Melts Containing KReO4

Chernyshev,

Apisarov,

Isakov

et al. 2023

Processes

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Molten Salt Electrodeposition: Review

De Silva,

Coons

2024

Energies

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Molten salt electrodeposition is the process of producing impressively dense deposits of refractory metals using the electrolysis of molten salts. However, predicting which electrochemical parameters and setup will best control different kinds of deposition (density, homogeneity, etc.) is an ongoing challenge, due to our limited understanding of the properties and mechanisms that drive molten salt electrodeposition. Because these advancements have been made rapidly and in different arenas, it is worth taking the time to stop and assess the progress of the field as a whole. These advancements have increasing relevance for the energy sector, the development of space materials and engineering applications. In this review, we assess four critical facets of this field: (1) how the current understanding of process variables enhances the electrodeposition of various molten salts and the quality of the resulting product; (2) how the electrochemical setup and the process parameters (e.g., cell reactions) are known to impact the electrodeposition of different metal coatings and refractory-metal coatings; (3) the benefits and drawbacks of non-aqueous molten salt electrodeposition, and (4) promising future avenues of research. The aim of this work is to enhance our understanding of the many procedures and variables that have been developed to date. The expectation is that this review will act as a stimulant, motivating scientists to delve further into the investigation of refractory-metal alloys by utilizing molten salt electrodeposition.

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Efficiency of Electrochemical Methods of Purification and Control over the Oxide Concentration in Halide Melts: PbCl2

et al. 2023

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The purification of molten salts from admixtures as well as the effective control of admixture concentration has attracted researchers’ interests. In the present paper, the possibility of the electrochemical purification of PbCl2 from PbO and the effective control over the oxide ions concentration in molten PbCl2 is studied at the temperature of 520 °C. The PbCl2 melt with the initial addition of 0.5 wt% of PbO was used as a molten salt sample. The method of potentiostatic electrolysis was used to remove the oxide additions from the melt; the linear and square-wave voltammetry dependencies were recorded, and the melt samples were taken for analysis. Based both on the results of the electrochemical measurements and the analysis of oxygen concentration in the electrolyte, we built linear empirical dependencies of the anode peak current of the oxidation of oxygen-containing electroactive anions on the PbO concentration in the studied melt. We demonstrated that the obtained dependencies may be used for direct electrochemical nondestructive in-situ control over the concentration of PbO dissolved in the PbCl2 melt containing up to 0.5 wt% of PbO. The deep electrochemical purification of the chloride PbCl2 melt from molten oxide (up to 0.044 wt% PbO or to 0.007 wt% of oxygen) was achieved by the potentiostatic electrolysis.

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Rhenium Electrodeposition and Its Electrochemical Behavior in Molten KF-KBF4-B2O3-KReO4

Cited by 3 publications

References 20 publications

Melting Behavior and Densities of K2B2OF6 Melts Containing KReO4

Melting Behavior and Densities of K2B2OF6 Melts Containing KReO4

Molten Salt Electrodeposition: Review

Efficiency of Electrochemical Methods of Purification and Control over the Oxide Concentration in Halide Melts: PbCl2

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