Potentiodynamic Studies of Antimony in Acidic and Alkaline Solutions

Wikstrom, L. L.; Nobe, Ken

doi:10.5006/0010-9312-31.10.364

Cited by 5 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar behaviour for pure antimony has been found by many authors [18–20,26,52,53]. They have established that the formation of the oxide layer on antimony is complex and proceeds through the passage of different oxo- and hydroxo- forms of Sb 3+ with different solubility such as (SbO) ads , (SbOH) ads and SbO + [18–20, 26, 48, 52]. Our results indicate that at a weak anodic polarisation from −0.36 to −0.20 V (or 150 ÷ 300 mV vs Е corr ), a diffusion limitation of the process is observed to outline a first step with a current density of about 20 µA cm −2 .…”

Section: Resultssupporting

confidence: 90%

“…Anodic polarisation leads to a complex multi-stage process of the oxide layer transformation and their interaction with the chloride environment. Similar behaviour for pure antimony has been found by many authors [18–20,26,52,53]. They have established that the formation of the oxide layer on antimony is complex and proceeds through the passage of different oxo- and hydroxo- forms of Sb 3+ with different solubility such as (SbO) ads , (SbOH) ads and SbO + [18–20, 26, 48, 52].…”

Section: Resultssupporting

confidence: 78%

“…According to the Pourbaix diagram, in the region of potentials of the second peak, an additional oxidation of one antimony atom to Sb 5+ occurs, whereby Sb 2 O 3 is converted to Sb 2 O 4 (with a mixed valence, containing both Sb(V) and Sb(III)) [50]. According to Wikstrom and Nobe [18], the complete oxidation of Sb 2 O 3 to Sb 2 O 5 depends on pH according to the following expression: Thus, for a neutral environment, this result can be extrapolated to 0.25 V SHE (or 0.04 V Ag/AgCl ).…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical investigations of antimony and antimony-rich alloys are relatively rare in the literature [18][19][20]. They are aimed towards the use of this element as an electrode for pH determination, stripping voltametric determination of trace metal ions and microcorrosion processes [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Corrosion behaviour of heterogeneous antimony-copper layers in chloride media

Tzaneva,

Kostov

2023

Corrosion Engineering, Science and Technology: The Internationa

View full text Add to dashboard Cite

The electrodeposited antimony-copper coatings demonstrate a varying degree of chemical and structural heterogeneity that determines their corrosion behaviour in 0.5M sodium chloride. The electrochemical and corrosion properties of layers at open circuit potential were investigated by electrochemical impedance spectroscopy and optical surface observation. Corrosion polarisation tests revealed that anodic behaviour of Sb-Cu alloys is similar for the all tested samples and depends on the antimony chemical resistance. Under anodic polarisation up to about −0.03 V Ag/AgCl a multistep process of anodic oxide film transformation was registered. The observations by SEM revealed that at a higher anodic polarisation many submicron-sized pits are formed. The formation of microgalvanic corrosion cells results in preferential dissolution of the antimony phase at both OCP and anodic polarisation.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Corrosion behaviour of heterogeneous antimony-copper layers in chloride media

Tzaneva,

Kostov

2023

Corrosion Engineering, Science and Technology: The Internationa

View full text Add to dashboard Cite

show abstract

“…At a low anodic polarization, three weakly expressed steps are observed on the polarization dependencies, starting at potentials of 0.054, 0.112, and 0.182 V. They are related to the transition of antimony through various oxo and hydroxo forms of Sb 3+ with different solubilities, such as (SbO) ads , (SbOH) ads , and SbO + and with gel-like layers formed on the antimony's surface [33,53,54]. Despite the enrichment of the near-electrode layer with slightly soluble corrosion products and the formation of different permeable layers, the surfaces are not passive.…”

Section: Sample R S (ω)mentioning

confidence: 99%

Characterization and Electrochemical Investigation of Heterogeneous Sb-Cu Coatings

Kostov,

Tzaneva

2023

Coatings

View full text Add to dashboard Cite

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.

show abstract