Title:
METHOD FOR MANUFACTURING STAINLESS STEEL FOR POLYMER FUEL CELL SEPARATOR HAVING EXCELLENT CONTACT RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2019/245076
Kind Code:
A1
Abstract:
Disclosed is a method for manufacturing stainless steel for a polymer fuel cell separator having excellent contact resistance. A method for manufacturing stainless steel for a polymer fuel cell separator having excellent contact resistance according to an embodiment of the present invention comprises: an electrolysis step of removing a first passive film formed on a stainless steel cold-rolled thin plate, the plate containing, in wt%, C: more than 0 to 0.02%, N: more than 0 to 0.02%, Si: more than 0 to 0.25%, Mn: more than 0 to 0.2%, P: more than 0 to 0.04%, S: more than 0 to 0.02%, Cr: 22 to 34%, Ti: more than 0 to 0.5%, Nb: more than 0 to 0.5%, and the balance Fe and other inevitable impurities; and a step of immersing the stainless steel plate in a mixed solution of nitric acid and hydrofluoric acid to form a second passive film on the stainless thin plate.
Inventors:
KIM JONG HEE (KR)
KIM KWANG-MIN (KR)
SEO BO-SUNG (KR)
KIM KWANG-MIN (KR)
SEO BO-SUNG (KR)
Application Number:
PCT/KR2018/006958
Publication Date:
December 26, 2019
Filing Date:
June 20, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
H01M8/021; C22C38/22; C22C38/24; C22C38/28; C23C22/06; C23C22/78; C25F1/06
Foreign References:
| KR20160082632A | 2016-07-08 | |||
| KR20090066866A | 2009-06-24 | |||
| KR20060123779A | 2006-12-04 | |||
| US6379476B1 | 2002-04-30 | |||
| JP2003223904A | 2003-08-08 | |||
| KR20180073157A | 2018-07-02 | |||
| KR20140081161A | 2014-07-01 | |||
| KR20130099148A | 2013-09-05 |
Other References:
See also references of EP 3813169A4
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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