US 12,331,409 B2
Fuel cell separator manufacturing method
Yusuke Nomura, Toyota (JP); Hijiri Hirata, Toyota (JP); and Tsuyoshi Seguchi, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jan. 8, 2024, as Appl. No. 18/406,980.
Claims priority of application No. 2023-035725 (JP), filed on Mar. 8, 2023.
Prior Publication US 2024/0301564 A1, Sep. 12, 2024
Int. Cl. C23G 1/08 (2006.01); H01M 8/021 (2016.01)
CPC C23G 1/081 (2013.01) [H01M 8/021 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A fuel cell separator manufacturing method involving immersing a stainless-steel base material formed into a shape of a separator in an acidic solution having a fluorine ion concentration of 0.1 ppm to 5 ppm and a pH of 1±0.2 at 80° C.±5° C. for 60 minutes for 60 minutes to 300 minutes to perform a modification treatment on a surface of the stainless-steel base material.