Effect of Ag and Sn on Lowering of Potential of Pb-base Alloy Anodes for Zinc Electrolytic Winning.

Taguchi, Masami; Iwahara, Reiji; Baba, Tsukasa

doi:10.2473/shigentosozai.112.475

Cited by 4 publications

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“…These authors also found that Ag in PbAg alloys increases the gel layer/crystal ratio (Monahov et al, 2000), however, there is no clear evidence in the literature that increasing this ratio affects the overpotential for oxygen evolution. Taguchi et al (1996) prepared Pb-Ag bi-electrodes by embedding silver wire into a Pb electrode and observed that OER occurs preferentially on Ag wire in preference to the Pb host metal. They concluded that, in PbAg alloy anodes, oxygen evolution occurs preferentially on the Ag rich portions on the alloy surface.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

The role of silver in enhancing the electrochemical activity of lead and lead–silver alloy anodes

McGinnity

Nicol

2014

Hydrometallurgy

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The role of silver as an alloying additive to reduce the overpotential of the oxygen evolution reaction on lead anodes used in the electrowinning of zinc has not previously been established. This paper summarizes the results of a detailed study of the mechanism of the action of silver both as an additive to the alloy and in solution. The presence of Ag 2 O 2 in the oxide layer was confirmed on Pb electrodes anodised in sulphuric acid electrolytes containing silver ions. The enhanced electrochemical activity of PbAg alloy anodes over Pb is attributed to the presence of Ag 2 O 2 in the corrosion layer.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

The role of silver in enhancing the electrochemical activity of lead and lead–silver alloy anodes

McGinnity

Nicol

2014

Hydrometallurgy

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“…Lead is the most common anode material used for metal electrowinning from acidic sulfate solutions. 1,2 To improve the mechanical properties, lead alloys such as lead-silver, lead-calcium, lead-calciumtin, etc., are widely adopted, but some of the alloys were also found to have improved electrochemical properties. [1][2][3][4][5][6] During use, the lead alloys are partially oxidized, mostly to PbO 2 , but oxygen evolution is the primary reaction.…”

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confidence: 99%

“…1,2 To improve the mechanical properties, lead alloys such as lead-silver, lead-calcium, lead-calciumtin, etc., are widely adopted, but some of the alloys were also found to have improved electrochemical properties. [1][2][3][4][5][6] During use, the lead alloys are partially oxidized, mostly to PbO 2 , but oxygen evolution is the primary reaction. The oxidation process of the lead anodes is complicated in a sulfate based electrolyte because of the possible formation of insoluble PbSO 4 , which is inert and passivating.…”

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confidence: 99%

Evaluation of Lead Anode Reactions in Acid Sulfate Electrolytes. I. Lead Alloys with Cobalt Additives

O’Keefe

1999

J. Electrochem. Soc.

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Lead alloys, such as lead-calcium-tin and lead-silver, are the primary insoluble anodes used in the electrowinning of metals. While some difficulties are encountered in their use, there is no obvious replacement that is economically and technically competitive. Two of the specific problems with lead include decreased cathode purity due to incorporation from corrosion products and the relatively high overpotential which increases cell voltage. To gain an improved understanding of the fundamental behavior of lead anodes, the polarization behavior of six different alloys in sulfuric acid was evaluated. Some tests were also made with Co(II) in the acid sulfate electrolyte. Notable differences were found in the multiple activation-passivation cycles, stability, and relative activity for oxygen evolution for the alloys, and the relative trends in behavior were established. Electrochemical impedance spectroscopy studies were also conducted at selected potentials. Overall, the data show that the electrochemical response, particularly the degree of polarization for the oxygen evolution reaction, of the lead alloy anodes are dependent on the surface phases and structures present. The ability to depolarize the anode reaction using Co(II) was particularly sensitive to the lead composition.

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“…Two types of pre-deposited PbO2 layers on IrO2-Ta2O5/Ti anodes were prepared. It is known that orthorhombic α-PbO2 and tetragonal β-PbO2 can be prepared by anodic electrolysis of a substrate in alkaline solutions and in acidic solutions, respectively 40) , 41) . Sample B was prepared by the pre-deposition of PbO2 on the IrO2-Ta2O5/Ti anode (sample A) .…”

Section: Methodsmentioning

confidence: 99%

Formation Mechanism of Non-conductive PbSO4 on IrO2-Ta2O5/Ti Anodes in Copper Foil Production

Kawaguchi

Morimitsu

2015

Journal of The Surface Finishing Society of Japan

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Effect of Ag and Sn on Lowering of Potential of Pb-base Alloy Anodes for Zinc Electrolytic Winning.

Cited by 4 publications

References 0 publications

The role of silver in enhancing the electrochemical activity of lead and lead–silver alloy anodes

The role of silver in enhancing the electrochemical activity of lead and lead–silver alloy anodes

Evaluation of Lead Anode Reactions in Acid Sulfate Electrolytes. I. Lead Alloys with Cobalt Additives

Formation Mechanism of Non-conductive PbSO<sub>4</sub> on IrO<sub>2</sub>-Ta<sub>2</sub>O<sub>5</sub>/Ti Anodes in Copper Foil Production

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