Study on the Degradation Rule of Long-term Storage Performance of Mg-Based Hydrogen Storage Alloy
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摘要:为探究Al粉和新型镁基贮氢合金ABM-2长储性能退化特性，采用71℃加速老化法研究金属粉在50%RH和75%RH环境中燃烧热和最小点火能量随老化时间的变化规律。结果表明：Al粉在71℃、50%RH环境中老化3d，最小点火能量大于1 000mJ，燃烧热降为0。ABM-2在71℃、50%RH和75%RH环境老化56d后，最小点火能量由老化前100mJ分别升高至200mJ和240mJ，燃烧热分别降低5.05%和8.64%。XRD和EDS分析表明，ABM-2中的MgH2缓慢氧化生成Mg(OH)2是导致ABM-2燃烧性能持续降低的主要原因，ABM-2中的Al表面形成氧化层，阻隔活性铝与水汽接触，因而相比Al粉具有较高的贮存稳定性。
Abstract:In order to explore the long-term storage performance degradation characteristics of Al powder and a new Mg-based hydrogen storage alloy ABM-2, the 71℃ accelerated aging method was used to research the law of change with aging time of combustion heat and minimum ignition energy(MIE) in 50%RH and 75%RH environments. The results show that MIE is greater than 1 000 mJ and combustion heat drops to 0 when Al powder is aged for three days in 71°C, 50%RH. After ABM-2 is aged for 56 days at 71℃, 50%RH and 75%RH, the MIE is increased from 100mJ before aging to 200mJ and 240mJ, respectively, and combustion heat is decreased by 5.05% and 8.64%, respectively. XRD and EDS tests show that the main reason to cause the continuous decline in the combustion performance of ABM-2 is the slow oxidation of MgH2 in ABM-2 to form Mg(OH)2. An oxide layer is produced on the surface of Al in ABM-2, which cut off the contact between activated Al with water vapor, so ABM-2 has higher storage stability compared with Al powder.
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