Passivation of Cu–Sb anodes in H2SO4−CuSO4 aqueous solution observed by the channel flow double electrode method and optical microscopy

Ninomiya, Yuma; Sasaki, Hideaki; Kamiko, Masao; Yoshikawa, Takeshi; Maeda, Masafumi

doi:10.1016/j.electacta.2019.03.064

Cited by 2 publications

(6 citation statements)

References 47 publications

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“…At a high anodic potential, approximately 0.6 V vs. Ag/AgCl, the current density for the Sb-Cu layers decreases slightly, and thus decrease is related to the formation of Sb 2 O 5 in a highly acidic environment [20]. Sb 2 O 5 is the thermodynamically stable form of antimony in the presence of oxygen.…”

Section: Sample R S (ω)mentioning

confidence: 99%

“…The electrochemical behavior and corrosion resistance of antimony and its alloys have most often been studied in sulfuric acid solutions [20,[33][34][35][47][48][49][50]. For this reason, we chose 0.5 M H 2 SO 4 as an electrolyte when studying the electrochemical behavior of Sb-Cu layers.…”

Section: Electrochemical Investigation Of Sb-cu Layers In Sulfuric Ac...mentioning

confidence: 99%

“…This result demonstrates that antimony dissolves preferentially and mostly at the edges of the crystals, leading to the flattening of macro-asperities and the appearance of microand submicrosized pores. Ninomiya et al report that during linear sweep voltammetry measurements in the anodic polarization of a Cu-5 wt.% Sb alloy, the Cu-Sb phase remains during Cu dissolution [20]. As a result, segregated Sb-rich regions are formed on the surface, accompanying the formation of pits [20].…”

Section: Sb-cu Surface Observation After Polarization Test In Sulfuri...mentioning

confidence: 99%

“…In metallurgically obtained alloys, the solubility of antimony in the copper phase is 7.8 at.% at 645 • C and decreases with the lowering of the temperature [19,20]. In a Cu-Sb bimetallic system, the content of copper is higher than that of antimony in all intermetallic Coatings 2023, 13, 1540 2 of 15 phases.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Gulevskii et al showed a 10-times-higher corrosion resistance than pure antimony in environments containing chloride ions, such as 5% NaCl and 10% HCl [36]. Ninomiya et al studied dissolution and passivation of Cu-5 wt.% Sb anodes under galvanostatic anodic polarization in aqueous H 2 SO 4 -CuSO 4 electrolytes in connection with the electrorefining of Cu [20]. They found that the anodic dissolution of Cu generated an Sb-rich compound layer on the anode surface, accompanying the formation of pits.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Electrochemical Investigation of Heterogeneous Sb-Cu Coatings

Kostov,

Tzaneva

2023

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In recent years, Cu-Sb-based alloys have been considered promising materials for various green applications; for instance, they can serve as catalysts for CO2 reduction, anodic material for metal-ion batteries, and a light-absorbing layer in solar cell. Our research is focused on the electrodeposition of antimony-copper alloy layers with copper content between 18–30 wt.%. The layers were observed by scanning, atomic force and transmission electron spectroscopies. Their phase structure, roughness, and hardness were also determined. The electrochemical properties were investigated by using electrochemical impedance spectroscopy and potentiodynamic polarization tests in 0.5 M sulfuric acid. Decreasing the copper content leads to an increase in chemical and morphological heterogeneity and an increase in the roughness from 1.74 to 2.94 μm due to the separation of antimony crystal clusters protruding above the surface but does not significantly affect the hardness and electrochemical behavior of the layers. Copper is recorded only in the form of the Cu2Sb phase. The corrosion current density and potentials of the layers are close to those of pure antimony (about 20 µA cm−2 and about −30 mV vs. Ag/AgCl). The highly porous structure obtained after anodic polarization seems suitable for catalytic purposes.

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Section: Sample R S (ω)mentioning

confidence: 99%

Section: Electrochemical Investigation Of Sb-cu Layers In Sulfuric Ac...mentioning

confidence: 99%

Section: Sb-cu Surface Observation After Polarization Test In Sulfuri...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization and Electrochemical Investigation of Heterogeneous Sb-Cu Coatings

Kostov,

Tzaneva

2023

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Challenges for development of technology for prevention of anode passivation during electrorefining of low-grade copper

Sasaki

Okabe

2020

Journal of the Mining and Materials Processing Institute of Jap

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Over the past years, the significance of recycling Cu and its accompanying metals has been increasing. However, the frequency of anode passivation increases during the electrorefining of copper when the copper anode contains a high concentration of impurities. When the amount of secondary materials (scraps) used is increased, the process of electrorefining is frequently troubled because e-waste contains elements that induce anode passivation. Therefore, the development of passivation-prevention technology for low-grade copper anode is essential. This article reviews previous research on the behavior of impurities in the Cu anode and their effects on passivation. The guiding principles for developing passivation-prevention technology are also outlined.

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Passivation of Cu–Sb anodes in H2SO4−CuSO4 aqueous solution observed by the channel flow double electrode method and optical microscopy

Cited by 2 publications

References 47 publications

Characterization and Electrochemical Investigation of Heterogeneous Sb-Cu Coatings

Characterization and Electrochemical Investigation of Heterogeneous Sb-Cu Coatings

Challenges for development of technology for prevention of anode passivation during electrorefining of low-grade copper

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