Preparation and properties of Al-rod-Pb-0.2%Ag composite anode by surface ceramization

YAN Wen-kai; CHEN Bu-ming; LENG He; HUANG Hui; GUO Zhong-cheng; XU Rui-dong

doi:10.13374/j.issn2095-9389.2018.11.04.002

Volume 41 Issue 10

Oct. 2019

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Article Navigation > Chinese Journal of Engineering > 2019 > 41(10): 1315-1323

YAN Wen-kai, CHEN Bu-ming, LENG He, HUANG Hui, GUO Zhong-cheng, XU Rui-dong. Preparation and properties of Al-rod-Pb-0.2%Ag composite anode by surface ceramization[J]. Chinese Journal of Engineering, 2019, 41(10): 1315-1323. doi: 10.13374/j.issn2095-9389.2018.11.04.002

Citation:

YAN Wen-kai, CHEN Bu-ming, LENG He, HUANG Hui, GUO Zhong-cheng, XU Rui-dong. Preparation and properties of Al-rod-Pb-0.2%Ag composite anode by surface ceramization[J]. Chinese Journal of Engineering, 2019, 41(10): 1315-1323. doi: 10.13374/j.issn2095-9389.2018.11.04.002

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Preparation and properties of Al-rod-Pb-0.2%Ag composite anode by surface ceramization

doi: 10.13374/j.issn2095-9389.2018.11.04.002

YAN Wen-kai¹⁾,
CHEN Bu-ming^{1), 2)
,
,},
LENG He²⁾,
HUANG Hui^{1), 2)},
GUO Zhong-cheng^{1), 2)},
XU Rui-dong¹⁾

1).
School of Metallurgical an Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
2).
Kunming Hendera of Science and Technology Co. LTD., Kunming 650106, China

More Information

Corresponding author: CHEN Bu-ming, E-mail: linxinyoou@fzu.edu.cn
Received Date: 2018-11-04
Publish Date: 2019-10-01

Abstract

Abstract

To obtain a low-cost anode with low oxygen evolution potential and high catalytic activity for zinc electrowinning, Pb-0.2%Ag alloy was coated on an aluminum matrix surface by extrusion cladding technology, and a film layer with high catalytic performance was formed on the surface of the Pb-0.2%Ag alloy and Al-rod-Pb-0.2%Ag anode by anodization in a fluorine-containing sulfuric acid solution. The thickness and hardness of the film were studied using a microscopic image analyzer and digital microhardness tester, and the ultimate tensile strengths of the two anodes were compared using an electronic tensile tester. The phase, morphology, and electrochemical performance of the Al-rod-Pb-0.2%Ag and Pb-0.2%Ag anode surface film were investigated using X-ray diffractometry, scanning electron microscopy, cyclic voltammetry, anodic polarization, and electrochemical impedance spectroscopy. The results show that the Al-rod-Pb-0.2%Ag anode surface forms a dense and thick oxide film layer more easily than the Pb-0.2%Ag anode and the hardness of the film layer is increased by 41.64%; moreover, the main phase is β-PbO₂, and the oxide film layer exhibits good electrocatalytic activity. The ultimate tensile strength of the new anode was 1.3 times that of the traditional anode, which greatly improves the mechanical properties of the anode material. Analytical data of anodic polarization curves reveal that the Al-rod-Pb-0.2%Ag/PbO₂ anode shows low oxygen evolution potential (1.35 V vs MSE, 500 A·m^-2) and high exchange current density (7.079×10^-5 A·m^-2) in zinc electrowinning system. Analytical data of cyclic voltammetry and EIS curves indicate that the Al-rod-Pb-0.2%Ag/PbO₂ anode has higher electrocatalytic activity, larger surface roughness, and smaller charge transfer resistance. In the zinc electrowinning experiment, the average cell voltage of the fence-like Al-rod-Pb-0.2%Ag/PbO₂ anode was 75 mV less than that of the traditional Pb-0.2% Ag anode, and the production of anode slime was greatly reduced.
- Al-rod-Pb-0.2%Ag,
- surface ceramic oxidation,
- zinc electrowinning,
- mechanical properties,
- electrocatalytic activity

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References(22)

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