Separator for fuel cell and method for manufacturing the same

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) C23C 18/42 (2006.01) C25D 3/48 (2006.01) C25D 7/00 (2006.01)

Patent

CA 2609461

At first step S1, a passivation film is removed by performing pickling on a separator for fuel cell and then a new passivation film is formed by performing heating at 200-280°C preferably. At second step S2, mechanical polishing is performed on the horizontal top surfaces in the waving portion of the separator for fuel cell, and a chipped portion is provided by chipping off a part of the passivation film. At third step S3, the separator for fuel cell is plated to form a first plating film composed of gold, rhodium, platinum or an alloy of two or more kinds of them starting at the periphery of the chipped portion. A complex ion stabilizer for suppressing dissociation of complex ions is added to plating bath.

Dans une première étape S1, un film de passivation (48) est éliminé par décapage chimique sur un séparateur (40) pour pile à combustible, et un nouveau film de passivation (42) est formé par chauffage à une température comprise de préférence entre 200 et 280°C. Dans une deuxième étape S2, un polissage mécanique est effectué les surfaces horizontales supérieures (24a, 26a) d'une partie ondulée (28) du séparateur (40) pour pile à combustible, et une partie écaillée (44) est formée par élimination partielle du film de passivation (42). Dans une troisième étape S3, le séparateur (40) pour pile à combustible est plaqué pour former un premier film de placage (46) composé d'or, de rhodium, de platine ou d'un alliage d'au moins deux de ces matériaux à partir de la périphérie de la partie écaillée (44). Un stabilisateur d'ions complexes est ajouté au bain de placage pour empêcher la dissociation des ions complexes.

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