Properties of Al/conductive coating/α-PbO₂-CeO₂-TiO₂/β-PbO₂-WC-ZrO₂ composite anode for zinc electrowinning

Abstract

The properties of Al/conductive coating/α-PbO₂-CeO₂-TiO₂/β-PbO₂-WC-ZrO₂ composite anode for zinc electrowinning were investigated. The electrochemical performance was studied by Tafel polarization curves (Tafel), electrochemical impedance spectroscopy (EIS) and corrosion rate obtained in an acidic zinc sulfate electrolyte solution. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDXS) were used to observe the microstructural features of coating. Anodes of Al/conductive coating/α-PbO₂-CeO₂-TiO₂/β-PbO₂, Al/conductive coating/α-PbO₂-CeO₂-TiO₂/β-PbO₂- WC, Al/conductive coating/α-PbO₂-CeO₂-TiO₂/β-PbO₂-ZrO₂, and Pb-1%Ag anodes were also researched. The results indicated that the Al/conductive coating/α-PbO₂-CeO₂-TiO₂/β-PbO₂-WC-ZrO₂ showed the best catalytic activity and corrosion resistant performance; the intensity of diffraction peak exhibited the highest value as well as a new PbWO₄ phase; the content of WC and ZrO₂ in coating showed the highest value as well as the finest grain size.

Keywords

coating / composite anode / corrosion resistant / electrocatalytic activity / zinc electrowinning

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