China Nonferrous Metallurgy

In the process of electrodeposition, due to chlorine ions, sulphate radical ions, etc. in the electrodeposition, the traditional lead alloy anode is easily corroded, resulting in the thinning and perforation of the electrode plate, and the life-time is greatly shortened. Some literatures showed that titanium-based anode materials have greater strength and strong corrosion resistance, and the doping of graphite in the electrode can enhance the dense and hard characteristics, thereby improving its corrosion resistance and conductivity. This study proposes to prepare a new type of electrode material with titanium as the substrate, tin antimony metal oxide as the intermediate layer, and lead dioxide as the outermost active layer, and investigation the effect of graphite powder and fluorine doped in the lead dioxide layer on the electrochemical properties of anode. The results showed that doping C element makes the PbO2 layer more dense. When C=2g/L, the cell voltage in the electrolytic copper experiment reaches the minimum value of 2.137V, and its corrosion resistance is the best, and the sample failure time reaches 305min; after doping F element, the size of the electrode grain does not change much, and when the addition amount of F ion is 0.1g/L, the cell voltage in the electrolytic copper test reaches the minimum value of 2.016V, and the failure time is the longest; the effect of co-doping C and F is better than single-doping C and single-doping F, and the failure time reaches 337min. The cell voltage of the new electrode material prepared is 10.3% lower than that of the traditional Pb-Ca-Sn anode, and there is no need to clean the lead mud during use. The results can provide a reference for the goal of high current efficiency, good corrosion resistance and long life of the anode in the process of metal electrolys.