(四川大学金属材料系，成都610065)
摘 要: 研究了贮氢合金LaNi4.7Al0.3和MlNi4.5Al0.5在纯氢(99.999%)及氢中含CO气体杂质条件下的p-c-t 特性及循环性能。结果表明，合金经CO毒化后，平台压升高，平台倾斜加剧，平台宽度缩小，饱和吸氢量减小。毒化后两种贮氢合金的循环性能衰退，而且随着循环次数的增加吸氢量减少，增加CO的浓度，吸氢量减少更加明显。合金贮氢性能下降的原因可能是由于表面生成了氧化物及新相，阻止了氢的吸附与扩散。
关键字: 一氧化碳；贮氢合金；毒化
（Department of Metal Materials and Engineering, Sichuan University, Chengdu 610065, P.R.China）
Abstract:The p-c-t degradation behaviours and cycling hydriding of LaNi4.7Al0.3 and MlNi4.5Al0.5 alloys were investigated by measuring the difference between pure hydrogen and hydrogen containing CO. The plateaus of LaNi4.7Al0.3 and MlNi4.5Al0.5 alloys were both lifted and inclined, the width of p-c-t curve was shorted, the absorbed hydrogen content was reduced drastically after poisoning. The amount of hydrogen absorbed was decreased continuously as the number of cycles was increased under same concentration of CO. The higher of the concentration of CO, the lower of the cycling properties. The reasons of poison was analyzed through XPS and XRD.
Key words: carbon monoxide; hydrogen storage alloys; poisoning
