METHOD FOR PRODUCING A FUEL CELL SEPARATOR

摘要

Provided is a method for producing a fuel cell separator which can achieve a stable power generation over a prolonged period of time and a method of producing the fuel cell separator. The fuel cell separator has a recess for gas flow path whose surface is roughened in such a manner that the arithmetic mean roughness Ra is 0.5 to 10 μm, and the recess for gas flow path is brought into contact with a fluorine-containing gas or a gas containing both fluorine and oxygen. The thus obtained fuel cell separator can retain a uniform liquid film formed on the surface thereof for at least 10 seconds when a test piece prepared from the fuel cell separator is immersed in water for 30 seconds and pulled out therefrom to a position at not less than 1 cm from the water surface within 1 second.

主权项

1. A method of producing a fuel cell separator made of a resin composition comprising a carbonaceous material (A) and a resin (B), the fuel cell separator having a recess for gas flow path on a surface of the separator; comprising the steps of
roughening a surface of the recess for gas flow path to an arithmetic mean roughness Ra of 0.5 to 10 μm; and hydrophilizing the recess for gas flow path by a fluorine-containing gas, wherein the carbonaceous material (A) is selected from the group consisting of carbon black, carbon fiber, amorphous carbon, expanded graphite, artificial graphite, natural graphite, kish graphite, vapor-grown carbon fiber, carbon nanotube and fullerene, or a combination of two or more of these, and wherein the fuel cell separator contains 0.5% by weight to 30% by weight of one or more resins selected from the group consisting of 1,2-polybutadiene, 3,4-polyisoprene, polyethylene, polypropylene, and polybutene-1 as the resin (B).