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铅银合金作为湿法冶金的首选电极材料,但仍存在成本高、综合性能不佳及稳定性差等方面的不足。通过对铅银合金的大塑性变形,在不增加成本的基础上改善了合金综合性能。即,在模角为90°的模具中,对Pb-Ag合金以C路径进行等通道转角挤压,然后进行100℃保温1 h退火。对挤压后试样的显微组织、导电性及电化学性能进行了研究。结果表明:随着挤压道次的增加,晶粒不断细化,合金的综合性能也发生显著变化。与铸造合金相比,6道次挤压后的合金电极的电阻率减少32.6%,电极极化电位降低12.4%,能耗降低28.8%。因此,等通道转角挤压法可用于制备新型节能型电极。
Lead-silver alloy as the preferred electrode material for hydrometallurgy, but there are still high cost, poor overall performance and poor stability. Through the large plastic deformation of lead-silver alloy, it can improve the comprehensive performance of the alloy without increasing the cost. That is, in a die having an angle of 90 °, the Pb-Ag alloy was subjected to equal-channel corner extrusion in the C-path and then annealed at 100 ° C for 1 hour. The microstructure, electrical conductivity and electrochemical properties of the extruded samples were studied. The results show that with the increase of extrusion pass, the grains are continuously refined and the overall properties of the alloy also change significantly. Compared with the cast alloy, the electrical resistivity of 6-pass extruded alloy electrode decreased by 32.6%, the electrode polarization potential decreased by 12.4% and the energy consumption decreased by 28.8%. Therefore, the equal channel corner extrusion method can be used to prepare a new type of energy-saving electrode.