熔体温度对Pb-Ag合金组织和电化学性能的影响

Effects of Melt Temperature on Electrochemical Performance and Microstructure of Pb-Ag Alloy

采用恒定的超声功率、频率和施振深度,在不同温度区间对Pb-Ag合金熔体施加超声振动,探讨功率超声对Pb-Ag合金的显微组织及电化学性能的影响。结果表明,随着熔体温度的升高,超声空化效应和声流作用发挥的越充分,过低或过高的熔体温度因超声处理不充分或熔体内部热效应,均导致晶粒粗大。仅在370℃保温条件下,超声波处理能使组织显著细化均化,电化学性能提升,电阻率下降12.95%,极化电位负移290 m V,槽电压下降1.77%,达到了一定的节能降耗的目的,为今后制备高性能低能耗的Pb-Ag合金电极奠定基础。

The supersonic vibration of Pb-Ag alloy melt was added by using ultrasonnd constant power, frequency and vibration depth in ranges of different temperatures. The effects of power ultrasound on microstructure and electrochemical performance of Pb-Ag alloy were discussed. The results show that ultrasonic cavitation effect and acoustic streaming effect are more obvious, with the increase of melt temperature; too low or high melt temperature will lead to the grains coarsening because of insufficient ultrasonic treatment or inner heating effects. Under the condition of thermal insulation at only 370℃ the ultrasonic treatment can make the microstructure remarkably refined and homogenized, and the electrochemical performance improves. The resistivity decreases by 12.95%, the polarization potential shifts by 290 mV negatively and cell voltage reduces by 1.77%. The energy-conserving goal is achieved, which lays the foundation for the high performance and low-energy of the future Pb-Ag alloy electrode.