Method for manufacturing fuel cell metallic separator

Abstract

A metallic separator according to a first embodiment is formed by obtaining a blank by rolling a metallic material having conductive inclusions, and removing a surface of the blank by 2% or more of the thickness of the blank. A metallic separator according to a second embodiment is formed by pressing a metallic plate so as to have a cross section including ridges and grooves alternatively, and removing parts of the ridged portions so as to make flattened surfaces. A metallic separator having conductive inclusions in its metal texture according to a third embodiment is formed by blasting a liquid containing two or more kinds of abrasives having different particle diameters to a blank after it has been rolled. A metallic separator having conductive inclusion in its metal texture according to a fourth embodiment is formed by blasting a passivation treatment liquid mixed with abrasives to the separator.

1 . A method for manufacturing a fuel cell metallic separator having conductive inclusions in its metallic texture, comprising: 
 blasting a liquid containing two or more kinds of abrasives each kind having different particle diameters from each other to a blank that has been rolled.    
     
     
         2 . A method for manufacturing fuel cell metallic separator as set forth in  claim 1 , further comprising: 
 applying a passivation treatment to a surface of the blank.    
     
     
         3 . A method for manufacturing a fuel cell metallic separator having conductive inclusions in its metal texture, the method comprising: 
 blasting a passivation treatment liquid mixed with abrasives to the separator.    
     
     
         4 . A method for manufacturing fuel cell metallic separator as set forth in  claim 3 , wherein the passivation treatment liquid includes nitride acid.