PURPOSE: To provide a surface treatment method for a hydrogen occlusion alloy mate rial having excellent surface activity or a hydrogen occlusion alloy material for obtaining electrodes, or an activation treatment method or activation method therefor, an activating soln. used for the same and a hydrogen occlusion alloy electrode having excellent initial activity. CONSTITUTION: The surface treatment method for the hydrogen occlusion alloy material by bringing a surface treating liquid, such as NH4 F.HF soln., into contact with the hydrogen occlusion allay material to remove surface activity-hindering materials, such as oxide, and forming surface active parts consisting of fine ruggedness and/or fine cracks in the hydrogen occlusion part and/or hydrogen passage part on the surface of the hydrogen occlusion alloy material, the activation treatment method for the hydrogen occlusion alloy electrode and the hydrogen occlusion alloy electrode having the excellent initial activity. The method for activating the alloy by automatically precipitating the active metal on the alloy surface by utilizing a difference in ionization tendencies and the activating soln. used for the same.
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