公开(公告)号：US20220393188A1

公开(公告)日：2022-12-08

申请号：US17774578

申请日：2020-02-12

Applicant: POSCO

Inventor： Young Jun Kim ,  Bo-Sung Seo ,  Kwang Min Kim ,  Dong-Hoon Kim

IPC: H01M8/021 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C21D8/12

Abstract: Disclosed is a method for manufacturing a stainless steel for a polymer electrolyte membrane fuel cell separator, and more particularly, a method for manufacturing a stainless steel for a polymer electrolyte membrane fuel cell separator capable of obtaining low contact resistance and high corrosion resistance by effectively removing a non-conductive coating and forming a new coating. According to an embodiment, the disclosed method for manufacturing a stainless steel for a polymer electrolyte membrane fuel cell separator includes performing alternating current electrolysis by immersing, in a sulfuric acid solution, a stainless steel having a passivation coating formed on a surface thereof by cold rolling and bright annealing, wherein the alternating current electrolysis is performed by applying a current density of 10 to 30 A/dm2.

公开(公告)号：US20220010451A1

公开(公告)日：2022-01-13

申请号：US17296300

申请日：2019-11-01

Applicant: POSCO

Inventor： Kwang Min Kim ,  Kkoch Nim Oh ,  Dong-Hoon Kim

IPC: C25D11/38 ,  C22C38/00 ,  C22C38/02 ,  C22C38/48 ,  C22C38/04 ,  C22C38/50

Abstract: Disclosed is a ferritic stainless steel with improved corrosion resistance. The ferritic stainless steel with improved corrosion resistance according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.02% or less (excluding 0), N: 0.02% or less (excluding 0), Si: 0.5% or less (excluding 0), Mn: 0.3% or less (excluding 0), Cr: 16 to 20%, Ni: 0.4% or less (excluding 0), the remainder of iron (Fe) and other inevitable impurities, and a Cr weight % content of a thickness region from a surface of a passivation film to 3 nm is 1.2 times or more than the Cr weight % content of the stainless base material.

公开(公告)号：US20230032485A1

公开(公告)日：2023-02-02

申请号：US17786342

申请日：2020-02-10

Applicant: POSCO

Inventor： Kwang Min Kim ,  Bong-Wn Kim ,  Bo-Sung Seo ,  Dong-Hoon Kim ,  Mun-Soo Lee

IPC: C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01M8/021

Abstract: Disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance. More particularly, disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance in a sulfuric acid environment which is a fuel cell operating environment. According to an embodiment, the stainless steel for a separator of a polymer fuel cell includes, in percent by weight (wt %), 0.09% or less of C, 1.0% or more and less than 2.5% of Si, 1.0% or less (excluding 0) of Mn, 0.003% or less of S, 20 to 23% of Cr, 9 to 13% of Ni, 1.0% or less (excluding 0) of W, 0.10 to 0.25% of N, and the remainder of Fe and other inevitable impurities, wherein a corrosion resistance index represented by Formula (1) below is 7 or more. 3*W+1.5*Si+0.1*Cr+20*N−2*Mn  (1) In Formula (1), W, Si, Cr, N, and Mn represent the content (wt %) of each element.

公开(公告)号：US11923580B2

公开(公告)日：2024-03-05

申请号：US15747973

申请日：2016-07-29

Applicant: POSCO

Inventor： Kwang Min Kim ,  Jong Hee Kim ,  Ki Hoon Jo ,  Bo Sung Seo

IPC: H01M8/1018 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23F1/28 ,  C23G1/08 ,  C25F3/06 ,  C25F5/00 ,  H01M8/021 ,  H01M8/0217 ,  H01M8/0228 ,  H01M8/1004

CPC classification number: H01M8/1018 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23F1/28 ,  C23G1/086 ,  C25F3/06 ,  C25F5/00 ,  H01M8/021 ,  H01M8/0219 ,  H01M8/0228 ,  H01M8/1004 ,  Y02P70/50

Abstract: Stainless steel for a fuel cell separator plate and a manufacturing method therefor are disclosed. The stainless steel for a fuel cell separator plate, according to one embodiment of the present invention, comprises: a stainless base material; and a passive film formed on the stainless base material, wherein a Cr/Fe atomic weight ratio in a 1 nm or less thickness region of the stainless base material, which is adjacent to an interface between the stainless and the passive film, is 0.45 or more. Therefore, by modifying the surface of the stainless steel for a fuel cell separator plate, a low interface contact resistance and a good corrosion resistance can be obtained, and a separate additional process such as precious metal coating can be removed, such that manufacturing costs are reduced and productivity can be improved.

公开(公告)号：US20200370154A1

公开(公告)日：2020-11-26

申请号：US16770244

申请日：2018-10-05

Applicant: POSCO

Inventor： Jong-Hee Kim ,  Kwang Min Kim ,  Bo-Sung Seo ,  Hak Kim

IPC: C22C38/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/20 ,  C21D8/02 ,  C21D7/02

Abstract: Disclosed is a non-magnetic austenitic stainless steel with improved strength and surface conductivity. An austenitic stainless steel according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.07 to 0.2%, N: 0.15 to 0.4%, Si: 0.8 to 2%, Mn: 16 to 22%, S: 0.01% or less (excluding 0), Cr: 12.5 to 20%, Cu: 1 to 3%, the remainder of iron (Fe) and other inevitable impurities, and satisfies the following equation (1). Ni+0.65Cr+1.05Mn+0.35Si+12.6C+33.6N≥40  (1) Ni, Cr, Mn, Si, C, N are % by weight of each element.

公开(公告)号：US12247309B2

公开(公告)日：2025-03-11

申请号：US17296300

申请日：2019-11-01

Applicant: POSCO

Inventor： Kwang Min Kim ,  Kkoch Nim Oh ,  Dong-Hoon Kim

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/48 ,  C22C38/50 ,  C25D11/38

Abstract: A ferritic stainless steel with improved corrosion resistance. The ferritic stainless steel with improved corrosion resistance according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.02% or less (excluding 0), N: 0.02% or less (excluding 0), Si: 0.5% or less (excluding 0), Mn: 0.3% or less (excluding 0), Cr: 16 to 20%, Ni: 0.4% or less (excluding 0), the remainder of iron (Fe) and other inevitable impurities, and a Cr weight % content of a thickness region from a surface of a passivation film to 3 nm is 1.2 times or more than the Cr weight % content of the stainless base material.

公开(公告)号：US10991954B2

公开(公告)日：2021-04-27

申请号：US16064891

申请日：2016-12-21

Applicant: POSCO

Inventor： Jong Hee Kim ,  Kwang Min Kim ,  Jae Hwa Lee ,  Yang Jin Chung ,  Ki Hoon Jo ,  Bo Sung Seo

IPC: H01M8/021 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C25F1/06 ,  H01M8/1018 ,  C23C22/50 ,  C23G1/08 ,  C21D7/02 ,  C21D1/28 ,  C21D7/04 ,  C22C38/22

Abstract: Stainless steel with improved hydrophilicity and contact resistance for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator, and a method of manufacturing the stainless steel Stainless steel are disclosed. Stainless steel for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator according to an embodiment of the present disclosure may include: by weight percent, 0 to 0.02% of C (excluding 0), 0 to 0.02% of N (excluding 0), 0 to 0.25% of Si (excluding 0), 0 to 0.2% of Mn (excluding 0), 0 to 0.04% of P (excluding 0), 0 to 0.02% of S (excluding 0), 20 to 34% of Cr, 0 to 0.6% of V (excluding 0), 0 to 0.5% of Ti (excluding 0), 0 to 0.5% of Nb (excluding 0), and the remainder comprising iron (Fe) and other unavoidable impurities, wherein a plurality of patterns may be formed on a surface of the stainless steel in a direction that is inclined with respect to a rolling direction, and the plurality of patterns are arranged repeatedly in the rolling direction.