Stainless steel for proton-exchange membrane fuel cell...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/22 (2006.01) C22C 38/00 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2503030

Provided are a stainless steel for a proton-exchange membrane fuel cell separator having high durability and a low contact resistance (i.e., high electrical conductivity) and a proton-exchange membrane fuel cell using the same. More specifically, a stainless steel for a proton-exchange membrane fuel cell separator has a composition comprising 0.03% mass % or less of C, 16-45 mass % of Cr, 0.03 mass % or less of N, 0.1-5.0 mass % of Mo, wherein a total of the C content and the N content satisfies 0.03 mass % or less; a balance portion is comprised of Fe and unavoidable impurities; an atomic ratio of Cr/Fe with respect to Al, Cr, and Fe contained in a passive film on a surface of the stainless steel is 1 or greater.

L'invention concerne un acier inoxydable pour un séparateur de pile à combustible polymère solide ayant une composition chimique en % en masse telle que C: correspond à 0,03 % ou moins, N: correspond à 0,03 % ou moins, Cr: est compris entre 16 et 45 %, Mo: est compris entre 0,1 et 5,0 % à condition que la somme des éléments de C et N soit de 0,03 % ou moins et que le reste soit constitué de Fe et d'autres impuretés inévitables, le rapport entre Cr/Fe calculé à partir des concentrations de Cr et Fe contenues dans le film à l'état passif formé sur la surface de l'acier inoxydable soit de 1 ou plus en termes de rapport atomique; ainsi qu'une pile à combustible polymère solide utilisant ledit acier inoxydable. L'acier inoxydable fait preuve d'une bonne résistance à la corrosion et d'une faible résistance au contact (à savoir il fait preuve d'une excellente électroconductivité).

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