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公开(公告)号：US20190186040A1
公开(公告)日：2019-06-20
申请号：US16327552
申请日：2017-08-09
Applicant: POSCO
Inventor： Won-Cheol Chung , Jong-Hee Kim , Kwang-Min Kim , Bo-Sung Seo
CPC classification number: C25F7/00 , C25F1/04 , C25F1/06 , H01M8/0202 , H01M8/021
Abstract: An embodiment of the present invention relates to a vertical electrolytic device having an improved structure to easily discharge bubbles generated during an electrolysis process that is used for surface modification of a separator of a fuel cell or the like. The vertical electrolytic device according to an aspect of the present invention includes an electrolytic bath in which an electrolyte is stored and an opening is formed in top and bottom portions thereof to allow vertical movement of a strip, wherein the bottom opening is formed to correspond with the strip to prevent discharge of the electrolyte stored in the electrolytic bath; and at least one pair of electrode parts disposed in the electrolytic bath so as to be facing each other on each side of the strip.
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2.发明申请公开(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
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.
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公开(公告)号：US11993852B2
公开(公告)日：2024-05-28
申请号：US17253866
申请日：2018-06-20
Applicant: POSCO
Inventor： Jong Hee Kim , Kwang-Min Kim , Bo-Sung Seo
IPC: C23C22/06 , C22C38/00 , C22C38/02 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C23C22/78 , C25F1/06 , H01M8/021 , H01M8/0228
CPC classification number: C23C22/06 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C23C22/78 , C25F1/06 , H01M8/021 , H01M8/0228
Abstract: Disclosed is a method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator. The method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator according to an embodiment of the present disclosure includes: electrolyzing to remove a first passivation film formed on a cold-rolled thin sheet of a stainless steel comprising, in percent (%) by weight of the entire composition, C: greater than 0 to 0.1%, N: greater than 0 to 0.02%, Si: greater than 0 to 0.25%, Mn: greater than 0 to 0.2%, P: greater than 0 to 0.04%, S: greater than 0 to 0.02%, Cr: 22 to 34%, Ti: greater than 0 to 0.5%, Nb: greater than 0 to 0.5%, the remainder of iron (Fe) and other inevitable impurities; and immersing in a mixed acid solution of nitric acid and hydrofluoric acid to form a second passivation film on the stainless cold-rolled thin sheet.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20210269920A1
公开(公告)日：2021-09-02
申请号：US17253866
申请日：2018-06-20
Applicant: POSCO
Inventor： Jong Hee Kim , Kwang-Min Kim , Bo-Sung Seo
IPC: C23C22/06 , C25F1/06 , H01M8/021 , H01M8/0228 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/20 , C22C38/02 , C22C38/00 , C23C22/78
Abstract: Disclosed is a method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator. The method of manufacturing a stainless steel with excellent contact resistance for a polymer fuel cell separator according to an embodiment of the present disclosure includes: electrolyzing to remove a first passivation film formed on a cold-rolled thin sheet of a stainless steel comprising, in percent (%) by weight of the entire composition, C: greater than 0 to 0.1%, N: greater than 0 to 0.02%, Si: greater than 0 to 0.25%, Mn: greater than 0 to 0.2%, P: greater than 0 to 0.04%, S: greater than 0 to 0.02%, Cr: 22 to 34%, Ti: greater than 0 to 0.5%, Nb: greater than 0 to 0.5%, the remainder of iron (Fe) and other inevitable impurities; and immersing in a mixed acid solution of nitric acid and hydrofluoric acid to form a second passivation film on the stainless cold-rolled thin sheet.
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公开(公告)号：US12049688B2
公开(公告)日：2024-07-30
申请号：US17259288
申请日：2019-06-14
Applicant: POSCO
Inventor： Kwang-Min Kim , Mi-Nam Park , Bo-Sung Seo
Abstract: The present disclosure relates to austenitic stainless steel with excellent electrical conductivity in which metal copper is formed in a non-conductive passivation film formed on the surface of stainless steel, and a method of manufacturing the same.
The austenitic stainless steel with excellent electrical conductivity according to an embodiment of present disclosure includes: a stainless steel base material comprising, in percent (%) by weight of the entire composition, C: 0.1% or less, Si: 0.1 to 1.0% or less, Mn: 0.1 to 2.0% or less, Cr: 15 to 24% or less, Ni: 6 to 12% or less, Cu: 0.5 to 3% or less, the remainder of iron (Fe) and other inevitable impurities; and a passivation film formed on the stainless steel base material, and the passivation film has a thickness of more than 0 and less than or equal to 5 nm, the Cu weight % content in the thickness region between 2 to 3 nm from the surface of the passivation film is 1.5 or more compared to the Cu weight % content of the stainless steel base material.-
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.
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公开(公告)号：US20210254203A1
公开(公告)日：2021-08-19
申请号：US17259288
申请日：2019-06-14
Applicant: POSCO
Inventor： Kwang-Min Kim , Mi-Nam Park , Bo-Sung Seo
Abstract: The present disclosure relates to austenitic stainless steel with excellent electrical conductivity in which metal copper is formed in a non-conductive passivation film formed on the surface of stainless steel, and a method of manufacturing the same.
The austenitic stainless steel with excellent electrical conductivity according to an embodiment of present disclosure includes: a stainless steel base material comprising, in percent (%) by weight of the entire composition, C: 0.1% or less, Si: 0.1 to 1.0% or less, Mn: 0.1 to 2.0% or less, Cr: 15 to 24% or less, Ni: 6 to 12% or less, Cu: 0.5 to 3% or less, the remainder of iron (Fe) and other inevitable impurities; and a passivation film formed on the stainless steel base material, and the passivation film has a thickness of more than 0 and less than or equal to 5 nm, the Cu weight % content in the thickness region between 2 to 3 nm from the surface of the passivation film is 1.5 or more compared to the Cu weight % content of the stainless steel base material.
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