Plated steel sheet

Patent metadata

Field	Value
Publication number	US-12454749-B2
Application number	US-202318711221-A
Country	US
Kind code	B2
Filing date	Jan 26, 2023
Priority date	Jan 31, 2022
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

To more reliably suppress LME and blowhole formation while maintaining excellent corrosion resistance.
A plated steel sheet according to the present invention, includes: a steel sheet as a base material; a plating layer located on at least part of a surface of the steel sheet; and an oxide layer located on a surface of the plating layer, where a chemical composition of the plating layer is made up of prescribed components, and Zn and impurities as the balance, and when a position at a depth of 5 nm from an uppermost surface of the oxide layer is observed by X-ray photoelectron spectroscopy (XPS), a value of an intensity ratio ([Al—O]+[Mg—O])/[Zn—O]) calculated from intensity of peaks respectively attributed to an Al—O bond, an Mg—O bond, and a Zn—O bond is 5.0 or more.

First claim

What is claimed is:

1. A plated steel sheet, comprising:
a steel sheet as a base material;
a plating layer located on at least part of a surface of the steel sheet; and
an oxide layer located on a surface of the plating layer, wherein
the plating layer contains: by mass %,
Al: 1.00 to 80.00%;
Mg: 1.00 to 20.00%;
Fe: 0.01 to 15.00%;
Si: 0 to 10.00%;
Ca: 0 to 4.00%, and further selectively contains 0 to 5.000% in total of:
Sb: 0 to 0.500%;
Pb: 0 to 0.500%;
Cu: 0 to 1.000%;
Sn: 0 to 1.000%;
In: 0 to 1.000%;
Bi: 0 to 1.000%;
Ti: 0 to 1.000%;
Cr: 0 to 1.000%;
Nb: 0 to 1.000%;
Zr: 0 to 1.000%;
Ni: 0 to 1.000%;
Mn: 0 to 1.000%;
V: 0 to 1.000%;
Mo: 0 to 1.000%;
Ag: 0 to 1.000%;
Li: 0 to 1.000%;
La: 0 to 0.500%;
Ce: 0 to 0.500%;
B: 0 to 0.500%;
Y: 0 to 0.500%;
Sr: 0 to 0.500%, with the balance composed of 5.00 mass % or more Zn and impurities, and
when a position at a depth of 5 nm from an uppermost surface of the oxide layer is observed by X-ray photoelectron spectroscopy (XPS), a value of an intensity ratio ([Al—O]+[Mg—O])/[Zn—O]) calculated from intensity of peaks respectively attributed to an Al—O bond, an Mg—O bond, and a Zn—O bond is 5.0 or more.

2. The plated steel sheet according to claim 1 , wherein
the value of the intensity ratio ([Al—O]+[Mg—O])/[Zn—O] is 10.0 or more.

3. The plated steel sheet according to claim 1 , wherein
the plating layer contains at least
Al: 18.00 to 60.00 mass % and
Mg: 5.00 to 15.00 mass %.

4. The plated steel sheet according to claim 2 , wherein
the plating layer contains at least
Al: 18.00 to 60.00 mass % and
Mg: 5.00 to 15.00 mass %.

5. The plated steel sheet according to claim 1 , wherein
the plating layer contains at least
Al: 35.00 to 60.00 mass % and
Mg: 7.00 to 15.00 mass %, and
an Mg 32 (Al, Zn) 49 phase is present in the plating layer, and
the Mg content [Mg], Zn content [Zn], and Al content [Al] (each unit: atom %) in the Mg 32 (Al, Zn) 49 phase satisfy the relationship of 0.50≤[Mg]/([Zn]+[Al])≤0.83.

6. The plated steel sheet according to claim 2 , wherein
the plating layer contains at least
Al: 35.00 to 60.00 mass % and
Mg: 7.00 to 15.00 mass %, and
an Mg 32 (Al, Zn) 49 phase is present in the plating layer, and
the Mg content [Mg], Zn content [Zn], and Al content [Al] (each unit: atom %) in the Mg 32 (Al, Zn) 49 phase satisfy the relationship of 0.50≤[Mg]/([Zn]+[Al])≤0.83.

7. The plated steel sheet according to claim 3 , wherein
the plating layer contains at least
Al: 35.00 to 60.00 mass % and
Mg: 7.00 to 15.00 mass %, and
an Mg 32 (Al, Zn) 49 phase is present in the plating layer, and
the Mg content [Mg], Zn content [Zn], and Al content [Al] (each unit: atom %) in
the Mg 32 (Al, Zn) 49 phase satisfy the relationship of 0.50≤[Mg]/([Zn]+[Al])≤0.83.

8. The plated steel sheet according to claim 4 , wherein
the plating layer contains at least
Al: 35.00 to 60.00 mass % and
Mg: 7.00 to 15.00 mass %, and
an Mg 32 (Al, Zn) 49 phase is present in the plating layer, and
the Mg content [Mg], Zn content [Zn], and Al content [Al] (each unit: atom %) in
the Mg 32 (Al, Zn) 49 phase satisfy the relationship of 0.50≤[Mg]/([Zn]+[Al])≤0.83.

9. A plated steel sheet, comprising:
a steel sheet as a base material;
a plating layer located on at least part of a surface of the steel sheet; and
an oxide layer located on a surface of the plating layer, wherein
the plating layer contains: by mass %,
Al: 1.00 to 80.00%;
Mg: 1.00 to 20.00%;
Fe: 0.01 to 15.00%;
Si: 0 to 10.00%;
Ca: 0 to 4.00%, and further selectively contains 0 to 5.000% in total of:
Sb: 0 to 0.500%;
Pb: 0 to 0.500%;
Cu: 0 to 1.000%;
Sn: 0 to 1.000%;
In: 0 to 1.000%;
Bi: 0 to 1.000%;
Ti: 0 to 1.000%;
Cr: 0 to 1.000%;
Nb: 0 to 1.000%;
Zr: 0 to 1.000%;
Ni: 0 to 1.000%;
Mn: 0 to 1.000%;
V: 0 to 1.000%;
Mo: 0 to 1.000%;
Ag: 0 to 1.000%;
Li: 0 to 1.000%;
La: 0 to 0.500%;
Ce: 0 to 0.500%;
B: 0 to 0.500%;
Y: 0 to 0.500%;
Sr: 0 to 0.500%, with the balance comprising 5.00 mass % or more Zn and impurities, and
when a position at a depth of 5 nm from an uppermost surface of the oxide layer is observed by X-ray photoelectron spectroscopy (XPS), a value of an intensity ratio ([Al—O]+[Mg—O])/[Zn—O]) calculated from intensity of peaks respectively attributed to an Al—O bond, an Mg—O bond, and a Zn—O bond is 5.0 or more.

Assignees

• Nippon Steel Corp

Inventors

• Mitsunobu Takuya
• Uranaka Masaaki
• Matsuba Masahiro
• Nakamura Toyomitsu

Classifications

• C23C2/40

  Plates; Strips · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• B32B15/013

  one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium · CPC title

• C23C2/20

  Strips; Plates · CPC title

• C23C2/12

  Aluminium or alloys based thereon · CPC title