US 11,939,676 B2
Hot-dipped Zn—Al—Mg-based plated steel
Tetsuya Toba, Tokyo (JP); Atsushi Morishita, Tokyo (JP); Yusuke Kohigashi, Tokyo (JP); Shinichi Yamaguchi, Tokyo (JP); and Takuya Mitsunobu, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/007,650
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Mar. 19, 2021, PCT No. PCT/JP2021/011526
§ 371(c)(1), (2) Date Dec. 1, 2022,
PCT Pub. No. WO2021/250973, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 2020-100073 (JP), filed on Jun. 9, 2020.
Prior Publication US 2023/0235437 A1, Jul. 27, 2023
Int. Cl. C23C 2/06 (2006.01); B32B 15/01 (2006.01); C22C 18/04 (2006.01); C23C 2/26 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01)
CPC C23C 2/06 (2013.01) [B32B 15/013 (2013.01); C22C 18/04 (2013.01); C23C 2/26 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A hot-dip Zn—Al—Mg-based plated steel comprising:
a steel; and
a plating layer formed on a surface of the steel,
wherein the plating layer contains, as an average composition, Mg: 1 to 10 mass %, Al: 4 to 22 mass %, and a remainder of Zn and impurities,
the plating layer includes an in Al—Zn mixed structure in an area ratio of 10% to 70% in a cross section of the plating layer in a matrix of an Al/Zn/MgZn2 ternary eutectic structure,
the Al—Zn mixed structure includes a first region that has a Zn concentration in a range of 75 mass % or more and less than 85 mass % and a second region that is present inside the first region and has a Zn concentration in a range of 67 mass % or more and less than 75 mass %, and
an area ratio of the second region in the Al—Zn mixed structure in the cross section of the plating layer is more than 0% and 40% or less.