Surface treatment method of hydrogen absorbing alloy

Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...

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148286, 148712, 4284721, 429 59, 429101, 420900, C23C 816

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061297895

ABSTRACT:
Steam is contacted with a hydrogen absorbing alloy in a temperature range from 200.degree. C. to 400.degree. C. With a contact catalytic reaction of water, a metal contained in the hydrogen absorbing alloy is changed to an oxide or a hydroxide. Hydrogen produced causes the Ni compound to be reduced and thereby the Ni metal that is catalytically active is produced. Thus, the surface of the hydrogen absorbing alloy is activated. The steam is contained in an inert gas or a reductive gas. This treatment method is suitable as an activation treatment for a hydrogen absorbing alloy used as an active material of a negative electrode of a secondary battery.

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patent: 5328524 (1994-07-01), Hertz
patent: 5499279 (1996-03-01), Chakvaborty
Abstract of Japanese Patent No. 3-289047, patent issued Dec. 19, 1991.
Abstract of Japanese Patent No. 4-137361, patent issued May 12, 1992.
Abstract of Japanese Patent No. 5-13077, patent issued Jan. 22, 1993.

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