The Effect Of Multi-energy Field On The Microstructure And Properties Of Pb-0.5% Ag Alloy Electrode

Electrode is a very critical device in the hydrometallurgical industry and the electrochemical industry,and plays a vital role in the electrolysis industry.Low cost,strong activity,good conductivity,high corrosion resistance,no pollution of the new electrode materials subject to more extensive attention and research.Because of low cost and good electrochemical properties,easy processing,recyclable and so on,Pb-Ag alloy electrode is the most widely electrode material used in electrochemical field,but the conventional method of preparation of the electrode is still many problems to overcome.For the shortcomings of Pb-Ag alloy with low strength,large internal resistance and high energy consumption,in this paper,the fine crystal technology is used to treat the Pb alloy during the solidification process,and refine the initial grain and structure of the homogenized alloy;Multi-energy field(physical sound field,strong plastic field,temperature thermal field)is used to further refine the alloy grain homogenization structure,the influence of multi-energy field on the microstructure of Pb alloy and the relationship between grain size and properties were discussed.By observing the alloy metallographic,the four-probe method measuring the electrical conductivity,electrochemical workstation testing electrochemical performance,and testing the electrode for slot voltage,discussing the corrosion resistance and energy saving,the effects of ultrasonic parameters(melt temperature,ultrasonic frequency,ultrasonic power),ultrasonic + cold rolling process parameters(reduction rate and annealing temperature)on the microstructure and properties of the alloy electrodes were studied.The results showed that:(1)The microstructure and properties of the alloy were analyzed,the results showed that the melt temperature had the greatest influence on the grain size and polarization potential of the ultrasonic process(ultrasonic frequency,ultrasonic power,melt temperature),and the ultrasonic power had the greatest influence on the electrode resistivity.The samples were subjected to ultrasonic + cold rolling,at the same annealing temperature,when the reduction rate was 40%,the grains were finely refined,and the equiaxed grains were distributed evenly.However,with the reduction rate of the amount of pressure,the recrystallization process is completed in a relatively short time under the combined action of the physical sound field and the strong plastic field.As the time is prolonged,the grain part grows up.The grain size can be effectively refined by annealing,and the grain size of recrystallized grains increases with the increase of annealing temperature.(2)Through the analysis of the alloy with different process parameters,the microstructures and microstructures were weaker and the grain size was uniform and dense,which could reduce the resistivity,improve the electrochemical performance,decrease the polarization potential and improve the corrosion resistance,To achieve the purpose of energy saving.The anode resistivity of the lead alloy prepared by the best ultrasonic process is 2.2495×10-6?·m,the polarization potential is 2.2895V,the tank voltage is 3.2198V,and the corrosion current density is 1.255xlO-4A/cm2.The conductivity of the grain can be reduced to 1.6934×10-6?·m by 15.83%,and the conductivity is 2.20V,the negative shift is 89.5 mV,the decrease is 4.1%,and the tank voltage drop is 3.1083V,the decrease is 3.46%,the catalytic activity is improved and the energy consumption is reduced,the corrosion current density is 1.083×10-4A/cm2,the decrease is 13.7%,the corrosion resistance is obviously improved,and the anode life is prolonged.(3)The effects of ultrasonic frequency,ultrasonic power and melt temperature on the microstructure and properties(conductivity,electrochemical properties,corrosion resistance)of Pb-0.5%Ag alloy anode materials were investigated,the optimum performance parameters of ultrasonic treatment were optimized by comprehensive performance analysis Ultrasonic temperature of 30kHz,ultrasonic power of 220W,melt temperature of 370?;ultrasonic + cold rolling method in the ultrasonic frequency 30kHz,ultrasonic power 220W,melt temperature 370?for 1 min,the annealing temperature of 120?,annealing time 30min,reduction rete 40%,the optimum process of preparing Pb-0.5%Ag alloy anode was obtained by the combination effect of multi-energy field.