中文摘要：

采用机械合金化技术制备了Mg58Al42储氢合金并借助于X射线衍射仪、PARM273A和M5210电化学综合测试仪研究了其在不同球磨时间下的物相结构以及放电容量和耐腐蚀等电化学性能。结果表明：合金粉末经高能球磨后产生了Mg17Al12新相，随着球磨时间的增加，衍射峰的相对强度下降，衍射峰变宽，合金的平均晶粒尺寸降低，内应力增大。合金的放电容量随球磨时间的延长先增加而后则降低，其中球磨20h时，放电容量最大。合金的动电位极化曲线出现了钝化现象，合金腐蚀电流密度随球磨时间的延长先增大而后降低。合金的交流阻抗谱均由单容抗弧组成，电极反应受合金／电解质溶液界面的电荷迁移所控制。

英文摘要：

Mg58Al42 hydrogen storage alloy was prepared by mechanical alloying （MA） method and its microstructural characteristics and electrochemical properties such as discharge capacities and corrosion mechanisms were investigated by XRD, PARM273A and M5210 electrochemical apparatus. The results show that the X-ray diffraction peaks have a deviation and broadening with increment of bali milling time because of fine grain size and internal stress. The discharge capacities of the present alloy increase at the beginning of ball milling and afterwards decrease with increment of ball milling, discharge capacity of which is biggest when it is milled for 20 h. There are passivation phenomena in potentiodynamic polarization curves. The corrosion current densities of the present alloy increase with time at the beginning of ball milling and afterwards decrease. The electrochemical impedance spectroscopies（EIS） of the present alloy are composed of single capacitive loop and electrode reaction is controlled by charge transfer at alloy/electrolyte interface, The CPE-T of alloy increases. It showed that the specific surface areas of the alloy increase with ball milling time.