US 12,188,129 B2
Surface modified galvanized steel sheet
Yon-Kyun Song, Incheon (KR); Yun-Ha Yoo, Incheon (KR); Joong-Chul Park, Incheon (KR); Hyun-Ju Jeong, Incheon (KR); and Jae-Dong Cho, Incheon (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Appl. No. 18/019,567
Filed by POSCO Co., Ltd, Pohang-si (KR)
PCT Filed Aug. 24, 2021, PCT No. PCT/KR2021/011239
§ 371(c)(1), (2) Date Feb. 3, 2023,
PCT Pub. No. WO2022/055151, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 10-2020-0114396 (KR), filed on Sep. 8, 2020.
Prior Publication US 2023/0304137 A1, Sep. 28, 2023
Int. Cl. C23C 2/26 (2006.01); B32B 3/02 (2006.01); B32B 15/01 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); B32B 15/20 (2006.01); C22C 18/00 (2006.01); C22C 18/04 (2006.01); C22C 21/10 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C23C 22/53 (2006.01); C23C 22/56 (2006.01); C23C 28/00 (2006.01)
CPC C23C 2/26 (2013.01) [B32B 3/02 (2013.01); B32B 15/012 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); B32B 15/20 (2013.01); C22C 18/00 (2013.01); C22C 18/04 (2013.01); C22C 21/10 (2013.01); C23C 2/06 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23C 22/53 (2013.01); C23C 22/56 (2013.01); C23C 28/30 (2013.01); C23C 28/321 (2013.01); C23C 28/3225 (2013.01); Y10T 428/12396 (2015.01); Y10T 428/1266 (2015.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12979 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/24967 (2015.01); Y10T 428/26 (2015.01); Y10T 428/263 (2015.01); Y10T 428/264 (2015.01); Y10T 428/265 (2015.01); Y10T 428/27 (2015.01)] 4 Claims
OG exemplary drawing
 
1. A galvanized steel sheet comprising:
a base steel sheet; and
a Zn—Al—Mg-based plating layer provided on at least one surface of the base steel sheet,
wherein the Zn—Al—Mg-based plating layer includes a surface modification region enriched with cerium (Ce) on a surface layer side of the Zn—Al—Mg-based plating layer, and
wherein the surface modification region comprises:
a convex portion provided by zinc-cerium nitrate salt (Zn—Ce—NO3—H2O) attached to a surface layer of the Zn—Al—Mg-based plating layer; and
a concave portion provided by removing magnesium (Mg) of the surface layer of the Zn—Al—Mg-based plating layer.