Preparation and Properties of Vanadium-based Hydrogen Storage Alloy Based on Mechanical Vibration
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摘要: 在浇注过程中引入不同振动频率和振动时间的机械振动,制备了V3TiNi0.56钒基储氢汽车电池合金试样,并与未经机械振动制备试样进行了耐腐蚀性能、充放电循环稳定性和显微组织的对比分析。结果表明:机械振动可明显细化合金的晶粒、改善内部组织,提高合金的耐腐蚀性能和充放电循环稳定性。随振动频率从20 Hz增大到60 Hz、振动时间从5 s延长到35 s时,合金的内部晶粒均先细化后粗化、耐腐蚀性能和充放电循环稳定性均先提高后下降。与未经机械振动的试样相比,在浇注过程中引入振动频率40 Hz、振动时间20 s机械振动而制备的合金腐蚀电位正移93 mV、放电容量衰减率减小22个百分点。Abstract: The mechanical vibration with various vibration frequencies and vibration time were introduced into the pouring process to prepare V3TiNi0.56 vanadium-based hydrogen storage alloy for automobile battery,and the corrosion resistance,charge-discharge cycle stability and microstructure of the obtained samples were compared with those of the samples without mechanical vibration.The results show that the mechanical vibration can obviously refine the grain,improve the internal structure and improve the corrosion resistance and charge-discharge cycle stability of the alloy.With the increase of vibration frequency from 20 Hz to 60 Hz and vibration time from 5 s to 35 s,the internal grains of the alloy are refined first and then coarsened,both of the corrosion resistance and charge-discharge cycle stability are improved first and then decreased.Compared with the samples without mechanical vibration,the corrosion potential of the alloy prepared by introducing mechanical vibration with vibration frequency of 40 Hz and vibration time for 20 s in the pouring process positively shifts by 93 mV and the decay rate of discharge capacity decreases by 22%.
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