US 12,006,576 B2
Plated steel sheet having excellent corrosion resistance, galling resistance, workability and surface property
Sung-Joo Kim, Gwangyang-si (KR); Kyung-Kwan Park, Pohang-si (KR); Moon-Hi Hong, Pohang-si (KR); Heung-Yun Kim, Pohang-si (KR); Tae-Yeul Park, Pohang-si (KR); Myung-Soo Kim, Gwangyang-si (KR); Il-Ryoung Sohn, Gwangyang-si (KR); Tae-Chul Kim, Gwangyang-si (KR); and Dae-Young Kang, Gwangyang-si (KR)
Assigned to POSCO, Pohang-si (KR); STEEL & CONVERGENCE TECHNOLOGY RESEARCH ASSOCIATION, Pohang-si (KR); and POSCO COATED & COLOR STEEL CO., LTD., Pohang-si (KR)
Appl. No. 17/762,533
Filed by POSCO, Pohang-si (KR); STEEL & CONVERGENCE TECHNOLOGY RESEARCH ASSOCIATION, Pohang-si (KR); and POSCO COATED & COLOR STEEL CO., LTD., Pohang-si (KR)
PCT Filed Sep. 24, 2020, PCT No. PCT/KR2020/012980
§ 371(c)(1), (2) Date Mar. 22, 2022,
PCT Pub. No. WO2021/060879, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0117525 (KR), filed on Sep. 24, 2019; and application No. 10-2020-0075328 (KR), filed on Jun. 19, 2020.
Prior Publication US 2022/0341017 A1, Oct. 27, 2022
Int. Cl. C23C 2/06 (2006.01); B32B 15/01 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); C21D 7/06 (2006.01); C22C 18/00 (2006.01); C22C 18/04 (2006.01); C23C 2/00 (2006.01); C23C 2/02 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C23C 28/00 (2006.01); C23C 28/02 (2006.01); C23C 30/00 (2006.01)
CPC C23C 2/06 (2013.01) [B32B 15/01 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 7/06 (2013.01); C22C 18/00 (2013.01); C22C 18/04 (2013.01); C23C 2/0035 (2022.08); C23C 2/02 (2013.01); C23C 2/285 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01); C23C 28/02 (2013.01); C23C 28/021 (2013.01); C23C 28/023 (2013.01); C23C 28/025 (2013.01); C23C 28/322 (2013.01); C23C 28/3225 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/24983 (2015.01); Y10T 428/263 (2015.01); Y10T 428/265 (2015.01)] 6 Claims
OG exemplary drawing
 
1. A plated steel sheet comprising:
a base steel sheet;
a Zn—Mg—Al-based plating layer provided on at least one surface of the base steel sheet; and
a Fe—Al-based inhibition layer provided between the base steel sheet and the Zn—Mg—Al-based plating layer,
wherein the plating layer includes, by weight, 4 to 10% of Mg and 5.1 to 25% of Al, with a balance of Zn and unavoidable impurities, based on components other than iron (Fe) ,
the plating layer includes a MgZn2 phase at a phase fraction of 24 to 50 wt %, and
an Al single phase is present inside the MgZn2 phase at a ratio of 1 to 30% to a total cross-sectional area of the MgZn2 phase in a thickness direction.