Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO2 Composite Anode During Zinc Electrowinning

doi:10.11944/j.issn.1000-0518.2015.08.140434

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (8): 955-962.DOI: 10.11944/j.issn.1000-0518.2015.08.140434

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Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO₂ Composite Anode During Zinc Electrowinning

YANG Jian^a,CHEN Buming^a^*(),WANG Shuai^a,GUO Zhongcheng^a^b

^aFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
^bKunming Hendera Science and Technology Co. Ltd., Kunming 650106, China

Received:2014-12-19 Accepted:2015-04-22 Published:2015-08-08 Online:2015-08-08
Contact: CHEN Buming
Supported by:
Supported by the National Natural Science Foundation of China(No.51004056)

Abstract

Abstract:

The anodic behavior of Al/Pb-0.3%Ag-0.06%Ca/β-PbO₂ composite electrode in the acidic zinc sulphate containing different concentrations of Cl^- was studied. The microstructures were investigated by scanning electron microscopy(SEM) and X-ray diffraction(XRD). With the increase of Cl^- concentration, the oxygen evolution overpotential, impedance and corrosion rate increase gradually; the intensity of diffraction peak of β-PbO₂ and α-PbO₂ decreases gradually; the dendritic crystal clusters on the anode surface disappear. When the Cl^- concentration is 300 mg/L, the apparent current density(i₀) of the anode reaches maximum and the anode shows the best electrochemical properties and corrosion resistance.

Key words: Al substrate, lead alloy anode, electrochemical properties, chloride ion, corrosion resistance

CLC Number:

YANG Jian, CHEN Buming, WANG Shuai, GUO Zhongcheng. Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO₂ Composite Anode During Zinc Electrowinning[J]. Chinese Journal of Applied Chemistry, 2015, 32(8): 955-962.

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Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO₂ Composite Anode During Zinc Electrowinning

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