Anodic dissolution of vanadium in molten LiCl–KCl–TiCl2

Milicevic, Ksenija; Friedrich, Bernd; Gussone, Joachim; Haubrich, Jan

doi:10.1007/s10800-017-1061-6

Cited by 6 publications

(11 citation statements)

References 30 publications

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“…The long-term objective of the work presented here is to establish fundamentals for the development of alloy deposition processes consisting of anodic dissolution [16] and codeposition of the constituents for titanium alloys like Ti-6Al-4V.…”

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confidence: 99%

Effect of vanadium ion valence state on the deposition behaviour in molten salt electrolysis

et al. 2018

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The electrodeposition process of vanadium from LiCl-KCl base electrolytes was investigated by means of cyclic voltammetry, galvanostatic electrolyses and micro analytical analysis of the deposits. It is demonstrated that the valence state of the vanadium ions has a critical influence on the feasibility of performing a reproducible and stable coating process aiming to obtain compact vanadium films. When the electrolyte contained predominantly trivalent vanadium ions, the process was unstable and the deposit consisted of dendrites. In contrast, making use of a comproportionation reaction of metallic vanadium and VCl 3 to divalent vanadium ions led to a stable deposition behaviour and allowed to obtain thick deposits with high current efficiencies. The disadvantageous behaviour of melts with mostly trivalent ions is explained by the fact that deposition is interfered by the reduction of trivalent to divalent ions under limiting current conditions.

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confidence: 99%

Effect of vanadium ion valence state on the deposition behaviour in molten salt electrolysis

et al. 2018

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“…Even those deposits with the highest vanadium contents of almost 90 at% (V-10 at% Ti) contained titanium in spite of a potential difference of E p (V 2+ /V) -E p (Ti 2+ /Ti) ≈ 100 mV. This finding could be explained by the fact that, although the ions in the melt and the electrode reactions are independent as long as there is a clean tungsten electrode, as soon as there is a vanadium deposit on the electrode titanium alloys with vanadium, which was already observed during anodic dissolution experiments at vanadium electrodes [29].…”

Section: Discussionmentioning

confidence: 78%

“…All experiments were carried out in a glove box system with a tube furnace under high-purity Argon (H 2 O, O 2 < 1 ppm) as described previously [29]. The electrolysis was carried out in glassy carbon crucibles (GCC, HTW, Sigradur G, GAT2).…”

Section: Chemicals and Materialsmentioning

confidence: 99%

Electrodeposition of titanium–vanadium alloys from chloride-based molten salts: influence of electrolyte chemistry and deposition potential on composition, morphology and microstructure

et al. 2020

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In the present study, we demonstrate co-deposition of titanium and vanadium from a eutectic LiCl-KCl electrolyte enriched with VCl 3 and TiCl 2 at 700 K. While the addition of metallic titanium to the electrolyte caused vanadium depletion by a displacement reaction, metallic vanadium addition created and stabilized divalent vanadium ions in the melt, which are supposed to positively affect the deposition process. Various electrochemical experiments were carried out with different electrolyte concentrations, and a relationship between applied potential, electrolyte concentration and composition of the deposit was established. The composition and the morphology of the obtained deposits were strongly affected by the electrolysis conditions. Electrodeposited vanadium-rich Ti-V alloys were found to grow as dendrites, whereas the titanium-rich alloys exhibited a dense cauliflower-like surface morphology. In contrast to deposits of the single elements, which are composed of comparably large faceted crystals, the Ti-V alloys obtained in this study were very fine grained, especially those with vanadium contents around 10-15 at%. Transmission electron microscopy revealed that, depending on the composition of the deposit, either a biphasic α + β microstructure in the case of low vanadium contents or β-(V,Ti) with small amounts of ω phase for high vanadium contents were found.

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“…Various molten salt electrolytes have been tested and proposed for Al-V alloy electrodeposition, including inorganic (halide [10,[15][16][17][18] and chloroaluminate [8,9,19]) and organic (ionic liquids [20]) electrolytes. Recently, several studies were reported on the deposition of Al-V alloys from inorganic molten salts, mostly from halide-based electrolytes [10,16].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, electrodeposition of Al-V from chloroaluminates has been rarely investigated [8,9,19]. A number of publication devoted to the electrochemistry of vanadium species in halide melts showed that the valence of vanadium species in halide electrolytes depends greatly on the experimental conditions, such as the electrolyte temperature and the source of the vanadium ions being introduced into the electrolyte [10,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions

Cvetković

Vukićević

Feldhaus

et al. 2021

Metals

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The Al-V alloys were synthetized by potentiostatic electrodeposition onto a glassy carbon electrode from equimolar AlCl3 + NaCl bath containing vanadium ions at 200 °C. The alloy deposits were characterized by X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The deposits were identified as Al3V and AlV3 alloys. It was found that intermetallic alloys were synthetized during aluminium underpotential deposition onto vanadium metal that was previously deposited on the glassy carbon electrode by diffusion-controlled overpotential deposition. Alloys were the result of solid-state interdiffusion between the initially deposited vanadium and the subsequently deposited aluminium. As a source to secure a constant concentration of vanadium in the electrolyte during deposition, vanadium anodic dissolution, and VCl3 melt addition were studied. The effect of vanadium ion concentration in the electrolyte on the composition and the surface morphology of the obtained deposits was investigated. The results indicate that controlled vanadium and aluminium codeposition could be a further step to the successful development of an advanced technology for Al3V and AlV3 alloy synthesis.

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Anodic dissolution of vanadium in molten LiCl–KCl–TiCl2

Cited by 6 publications

References 30 publications

Effect of vanadium ion valence state on the deposition behaviour in molten salt electrolysis

Effect of vanadium ion valence state on the deposition behaviour in molten salt electrolysis

Electrodeposition of titanium–vanadium alloys from chloride-based molten salts: influence of electrolyte chemistry and deposition potential on composition, morphology and microstructure

Electrodeposition of Aluminium-Vanadium Alloys from Chloroaluminate Based Molten Salt Containing Vanadium Ions

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