公开(公告)号：US20230235437A1

公开(公告)日：2023-07-27

申请号：US18007650

申请日：2021-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Tetsuya TOBA ,  Atsushi MORISHITA ,  Yusuke KOHIGASHI ,  Shinichi YAMAGUCHI ,  Takuya MITSUNOBU

IPC: C23C2/06 ,  C22C18/04 ,  B32B15/01 ,  C23C2/40 ,  C23C2/28

CPC classification number: C23C2/06 ,  C22C18/04 ,  B32B15/013 ,  C23C2/40 ,  C23C2/29

Abstract: This hot-dip Zn—Al—Mg-based plated steel includes: a steel; and a plating layer formed on a surface of the steel, in which the plating layer contains, as an average composition, Mg: 1 to 10 mass %, Al: 4 to 22 mass %, and a remainder consisting of Zn and impurities, the plating layer includes an (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.