Anode Preparation Of Lead Rare Earth Alloy And Anode Simulation Analysis Of Different Shapes

At present,there are some problems such as high energy consumption and poor corrosion resistance of lead-calcium-tin and lead-silver anodes which are widely used in industry.In this paper,Pb-Ca-Sn-RE(Ca 0.075%,Sn 0.6%,Content of RE were 0,0.05%,0.1%,0.15%respectively,these value representative percentage of mass and as the same in the following)and Pb-Ag-RE(Ag 0.25%,Content of RE were 0,0.02%,0.06%,0.1%,respectively)were prepared by adding the mixed rare earth element RE to lead-calcium-tin and lead-silver alloys.Its microstructure,hardness and the electrochemical properties were tested.The current density distribution of lead-silver alloy anode which have different shapes was simulated by Comsol Multiphysics,and simulating flat bar-shaped anodes with different pole distance.These results getted as follows.(1)Adding RE to Pb-Ca-Sn imprved mechanical properties of Pb-Ca-Sn alloy,enhanced the redox performance,increased the amount of PbO2 of anodic oxide film,improved the catalytic activity and conductivity of lead-calcium-tin alloy anodes.The anode had best performance with with RE content 0.1%.(2)Adding RE to Pb-Ag refined alloy grains imprves mechanical properties of Pb-Ag alloy,increased the amount of PbO2 of anodic oxide film,enhanced the redox performance,increased the apparent exchange current density and improved the electrocatalytic activity of lead-silver alloy anodes,brought to a more uniform of the anode surface oxide layer,and improved the conductivity and corrosion resistance of Pb-Ag anode.The oxygen evolution potential of the anode was decreased slightly and the apparent exchange current density was improved after galvanostatic electrolysis for 24h.The anode had best performance with RE content 0.06%.(3)Bar-shaped anode is better compared with plate-shaped anode.Its anode edge effect was small,the corrosion resistance was better,the electrolyte flow was better,the electrolyte resistance was lower,the power line was dense and uniform,and it had high efficiency of electrodeposition zinc.The flat bar-shaped anode was better than rod-shaped anode.Its current impact was small,the edge corrosion resistance was better,the reaction on the anode was uniform and the anode life was long.The experiment results were consistent with the simulation analysis results.The anode current density decreased and the power line distribution becomed sparse as the pole distance increased of the flat bar-shaped anodes.The anode reaction was uniform on the anode surface,the distribution of power lines uniform and size was profer of flat bar-shaped anodes with 7mm pole distance.In this proposition that ensuring the efficiency of electrodeposition of zinc,it reduced energy consumption,anode life was extended as well.