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Hydriding characteristics of LaNi 47Al0 .3 alloys with surfaces modified by high-purity anhydrous HF were evaluated after long-term preservation in air.Affected by poisoning species in air, untreated alloy hydriding activity was enormously decreased.HF-treated alloys with a modified surface layer containing metal fluoride NiF 2 , LaF 3 and AlF 3 maintained relatively high activity.In high-humidity air, metal fluoride NiF 2 reacted with moisture to form hydrous Ni (OH)2, and permeation of poisonous species such as O2, CO and CO 2 was markedly inhibited by moisture-condensed hydrate screens.

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