Prepared By Pulsed Electrodeposition Ti-based Composite Anode Materials And Their Properties

Non-ferrous metal resources are plentiful in our country. Although Pb-Ag alloy anodes are widely used in hydrometallurgy processes such as electrowinning Zn, Cu, Ni, Co etc. But the shortages such as high oxygen evolution potential, low mechanics property and electroconductibility, anodic dissolution pollute the electrolyte, which limits its efficient. Special attention has been paid to new kinds of composite anodes for the advantage of combine and synergy of the materials. This paper prepared Ti/Pb-WC-PANI composite anodes on Ti substrate by pulse electrodeposition technique.Ti/Pb-WC-PANI composite anodes have been prepared by pulse electrodeposition in electrolyte which added conductive PANI and WC activity particles. The effects of electrodeposition method, conductive PANI and WC activity particles deposit jointly with Pb2+ on electrocatalytic activity for oxygen evolution were studied. Anodic polarization curve, CV curve and tafel curve were tested in the solution of ZnSO4+H2SO4 and electrochemical performance parameters such as oxygen evolution kinetic parameters, electrode reaction reversibility, voltammetry charge, corrosion potential and corrosion current densityof the composite inert anodes have been obtained, the surface morphology, section organization and composition distribution has been studied by means of SEM. The results show that the Ti/Pb-WC-PANI composite anode prepared by pulse electrodeposition possesses compact organization, composition uniformly distributed, higher electrocatalytic activity for oxygen evolution and corrosion resistance.By using pulse electrodeposition method, the effects of conductive PANI and WC activity particles density, verage current density and parameters of pulse width on oxygen evolution kinetic parameters, electrode reaction reversibility, voltammetry charge, surface morphology and composition distribution of composite inert anode were stuied. The process of preparing composite inert anode was optimized. Compared with Pb-1.0wt%Ag alloy inert anode, PANI and WC activity particles deposited in matrix metal of Pb can be lowering the oxygen evolution overpotential in the process of zinc electrowinning Furthermore, exchange current density and electrocatalytic surface are significantly higher than Pb-1.0wt%Ag alloy inert anode. The comparative study between Ti/Pb-WC-PANI composite anode and Pb-1.0wt%Ag alloy anode on zinc electrowinning were carried out in the solution of 50g/L Zn2+,150g/L H2SO4 and 35℃. In the course of zinc electrowinning, the cell voltage of Ti/ Pb-WC-PANI composite anode was 300mV lower than Pb-1.0wt%Ag alloy inert anode, demonstrated very good energy saving potential.