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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
Published on: November 3, 2017
Polarization behavior of Pb-Co powder-pressed alloy for electrowinning
Shuai Wang1, Xiang-Yang Zhou1, Chi-Yuan Ma1
1School of Metallurgy and Environment, Central South University Lushan South Street 932, Yuelu District Changsha 410083 China j-yang@csu.edu.cn +86-73188836329 +86-73188836329.
Abstract:
In this study, Pb-Co powder-pressed alloy was fabricated and used as a suitable anode material to replace Pb-Ca-Sn alloy in electrowinning. The Pb-Co anodes and the traditional Pb-Ca-Sn alloy on the electrochemical properties are investigated in a 160 g L-1 H2SO4 solution at 35 °C using galvanostatic polarization, electrochemical impedance spectroscopy and Tafel test. Thereafter, the anodic oxide layer is observed by energy dispersive X-ray spectroscopy along with scanning electron microscopy and X-ray diffractometry. The results show that the potential and oxygen evolution over-potential of the anodes exhibit a declining trend with increasing the fraction of Co. The anode potential of the Pb-2 wt% Co is approximately 170 mV lower than that of Pb-Ca-Sn alloy and reaches a stable value of 1.291 V at 35 °C, which shows good electrocatalytic performance and commercial application prospect.
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