Effect of current density, temperature and bath pH on properties of Ni–W–Co alloys obtained by electrodeposition

Oliveira, José Anderson Machado; Almeida, Arthur Filgueira de; Campos, Ana Regina Nascimento; Prasad, Shiva; Alves, José Jaílson Nicácio; Santana, Renato Alexandre Costa de

doi:10.1016/j.jallcom.2020.157104

Cited by 43 publications

(14 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Current efficiency η is related to current density, use of additives, the content of metals in electrolyte, the temperature of electrolyte, etc. [9] Increasing the temperature or the concentration of a certain ratio of molten salt will sharply increase the pollution, so this paper in the process study only discusses the influence of current density on the current efficiency of tungsten recovery.…”

Section: Effect Of Current Density On Current Efficiencymentioning

confidence: 99%

Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition

Xing

Feng

et al. 2023

J. Electrochem. Sci. Technol

View full text Add to dashboard Cite

The accumulation of spent carbide (YG8), not only pollutes the environment but also causes waste of tungsten, cobalt and other rare metal resources. To better address this issue, we proposed a combined electrochemical separation process of lowtemperature aqueous solution and high-temperature molten salt for tungsten and cobalt. H 2 WO 4 was obtained from spent carbide in an aqueous solution, and we calcined it to obtain WO 3 , which was used as a raw material to obtain tungsten by using molten salt electrodeposition. The influence of the current efficiency and the electrochemical behavior of the discharge precipitation of W(VI) were also studied. The calcination results showed that the morphology of WO 3 was regular and there were no other impurities. The maximum current efficiency of 82.91% was achieved in a series of electrodeposition experiments. According to XRD and SEM analysis, the recovered product was high purity tungsten, which belongs to the simple cubic crystal system. In the W(VI) reduction mechanism experiments, the electrochemical process of W(VI) in NaCl-Na 2 WO 4 -WO 3 molten salt was investigated using linear scanning voltammetry (LSV) and chronoamperometry in a three-electrode system. The LSV showed that W(VI) was reduced at the cathode in two steps and the electrode reaction was controlled by diffusion. The fitting results of chronoamperometry showed that the nucleation mechanism of W(VI) was an instantaneous nucleation mode, and the diffusion coefficient was 7.379×10 -10 cm 2 •s -1 .

show abstract

Section: Effect Of Current Density On Current Efficiencymentioning

confidence: 99%

Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition

Xing

Feng

et al. 2023

J. Electrochem. Sci. Technol

View full text Add to dashboard Cite

show abstract

“…In the process of electrodeposition, the electrolyte temperature can affect the migration rate of transition-metal ions, thus affecting the nucleation rate of the deposition products, changing the morphology and crystallinity of the products, and finally affecting the electrochemical performance. 86,87 For example, when Oliveira et al 88 electrodeposited the Ni-Co-W alloy, it was found that the bath temperature favored Ni deposition when the temperature was extrapolated to lower values, i.e., 21.48 1C. Co deposition was favored when the bath temperature was extrapolated to high values, i.e., 63.52 1C.…”

Section: Electrolyte For Electrochemical Synthesismentioning

confidence: 99%

Electrochemical preparation of nano/micron structure transition metal-based catalysts for the oxygen evolution reaction

Han

Zhao

et al. 2022

Mater. Horiz.

View full text Add to dashboard Cite

show abstract

“…In developing ILs for copper electrodeposition, the recovery of copper with high efficiency and low cost is of the topmost priority. There are multi-factors affecting the electrodeposition process, such as current density, potential, , stirring requirements, , temperature, , substrate material, and current waveforms . In addition, multi-objective research is also necessary for efficient metal recovery, and it can be realized by introducing computational fluid dynamics (CFD) simulation for developing models of metal electrodeposition or response surface methodology (RSM) for the optimization of the operation parameters .…”

Section: Introductionmentioning

confidence: 99%

Copper Recovery from Industrial Bimetallic Composite Ionic Liquids by Direct Electrodeposition and the Effect of Temperature and Ultrasound

et al. 2023

View full text Add to dashboard Cite

Critical processing protocols of industrial bimetallic composite ionic liquid (IL) are necessary to assure good mass transfer rates for process optimization and efficient metal recovery. Here, the effects of different conditions on the electrochemical behavior and copper recovery from the industrial bimetallic composite IL are crucial for effective resource utilization. Cyclic voltammetry (CV) shows that the reduction of Cu(I) to Cu(0) during the cathodic reduction region is the irreversible diffusion-controlled process, and the diffusion coefficient increased with temperature which indicated that increasing temperature could promote the diffusion and mass transfer. During electrodeposition, metallic copper is obtained exclusively on the cathode, while CuCl2 accumulates exclusively on the anode. Scanning electron microscopy shows that the micron-size electrodeposits become larger and significantly rougher with increasing temperature and ultrasonic frequency, illustrating that these factors hasten the nucleation and crystallization rates at high overpotentials. The efficiency of copper recovery is greatly improved by employing high temperature and ultrasonic cavitation, and the highest values correspond to r = 76.9% at 80 °C and r = 63.6% at 40 kHz. The study lays the foundation for efficient and rapid recovery of copper from spent ILs.

show abstract

Effect of current density, temperature and bath pH on properties of Ni–W–Co alloys obtained by electrodeposition

Cited by 43 publications

References 38 publications

Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition

Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition

Electrochemical preparation of nano/micron structure transition metal-based catalysts for the oxygen evolution reaction

Copper Recovery from Industrial Bimetallic Composite Ionic Liquids by Direct Electrodeposition and the Effect of Temperature and Ultrasound

Contact Info

Product

Resources

About