SURFACE TREATING METHOD FOR HYDROGEN STORAGE ALLOY POWDER

摘要

PROBLEM TO BE SOLVED: To provide a surface treating method for a hydrogen storage alloy capable obtaining an optimum amt. of nickel-enriched layer in spite of the variation of process conditions in a nickel-enriched layer forming treatment. SOLUTION: This surface treating method for hydrogen storage alloy powder is the one executing nickel-enriched layer forming treatment in such a manner that hydrogen storage alloy powder contg. nickel is treated to form a nickel- enriched layer on the surface of the hydrogen storage powder, in which the magnetic properties of the hydrogen storage alloy powder varying in accordance with the change of the surface properties of the hydrogen storage alloy powder in the process of the nickel-enriched layer forming treatment are detected, and the treatment is finished at the point of time when the magnetic properties reach the prescribed value.