Separator for polymeric electrolyte fuel cell having a roughened surface

摘要

The present invention provides a separator for a polymer electrolyte fuel cell, having, at the surface contacting with the electrode of the fuel cell, a surface roughness of Ra=0.1 to 10 mum when measured by a surface roughness tester having a probe of 5 mum in front end diameter; and a process for producing the above separator for a polymer electrolyte fuel cell, which process comprises immersing a molding of a separator for a polymer electrolyte fuel cell, in an acidic solution. The above separator for a polymer electrolyte fuel cell alleviates the problems of the prior art and has low contact resistance at the interface with the electrode of the fuel cell.