To evaluate MmNiAI alloy systems for use as a negative electrode in the nicke1-hydrogen battery, the oxidation of the alloy surface in an alkaline solution has been studied by means of cyclic vQltammetry,XRD,ESCA,EPMA,TEM and AAS methods.The crystallographic structure of the surface of the cube cut out from an al/0y ingot was found to be not necessarily isotropic even if the alloy consisted of uniform compositions,