Hot-dip zn-alloy-plated steel sheet

Patent metadata

Field	Value
Publication number	US-2016305003-A1
Application number	US-201415037068-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Dec 3, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

This hot-dip Zn-alloy-plated steel sheet comprises: a steel sheet; a hot-dip Zn-alloy-plated layer arranged on a surface of the steel sheet; and a complex oxide coating film arranged on a surface of the hot-dip Zn-alloy-plated layer. The complex oxide coating film includes vanadium and a constituent component of the hot-dip Zn-alloy-plated layer, and the entire surface of the coating film satisfies the following formula (1): S[Hydroxide]/(S[Hydroxide]+S[Oxide])×100≦40. In formula (1): S[Oxide] is the area exhibited by a peak having a center at approximately 1022 eV ascribable to a Zn oxide in an intensity profile in XPS analysis of the surface of the complex oxide coating film; and S[Hydroxide] is the area exhibited by a peak having a center at approximately 1023 eV ascribable to a Zn hydroxide in an intensity profile in XPS analysis of the surface of the complex oxide coating film.

First claim

1 . A hot-dip Zn alloy-plated steel sheet comprising:
a steel sheet; a hot-dip Zn alloy plating layer disposed on a surface of the steel sheet; and a composite oxide film disposed on a surface of the hot-dip Zn alloy plating layer; wherein the composite oxide film comprises constituent components of the hot-dip Zn alloy plating layer and vanadium, and the composite oxide film satisfies, at a whole of a surface of the composite oxide film, following Equation 1:

S


[
Hydroxide
]

S


[
Hydroxide
]

+

S


[
Oxide
]

×
100

≤
40

(

Equation



1

)

S[Oxide] is a peak area derived from Zn oxide and centered at approximately 1022 eV in an intensity profile of the XPS analysis of the surface of the composite oxide film; and S[Hydroxide] is a peak area derived from Zn hydroxide and centered at approximately 1023 eV in the intensity profile of the XPS analysis of the surface of the composite oxide film.

2 . The hot-dip Zn alloy-plated steel sheet according to claim 1 , wherein:
the hot-dip Zn alloy plating layer comprises 1.0 to 22.0% by mass of Al, 0.1 to 10.0% by mass of Mg, and the balance of the hot-dip Zn alloy plating layer being Zn and unavoidable impurities.

3 . The hot-dip Zn alloy-plated steel sheet according to claim 2 , wherein:
the hot-dip Zn alloy plating layer further comprises at least one selected from the group consisting of 0.001 to 2.0% by mass of Si, 0.001 to 0.1% by mass of Ti, and 0.001 to 0.045% by mass of B.

4 . The hot-dip Zn alloy-plated steel sheet according to claim 1 , wherein an adhering amount of the vanadium contained in the composite oxide film is in the range of 0.01 to 10.0 mg/m 2 .

5 . The hot-dip Zn alloy-plated steel sheet according to claim 2 , wherein an adhering amount of the vanadium contained in the composite oxide film is in the range of 0.01 to 10.0 mg/m 2 .

6 . The hot-dip Zn alloy-plated steel sheet according to claim 3 , wherein an adhering amount of the vanadium contained in the composite oxide film is in the range of 0.01 to 10.0 mg/m 2 .

Assignees

• Nisshin Steel Co Ltd

Inventors

• Shimizu Atsuo
• Matsuno Masanori
• Yamamoto Masaya
• Taketsu Hirofumi

Classifications

• C23C2/06 Primary

  Zinc or cadmium or alloys based thereon · CPC title

• C23C2/20

  Strips; Plates · CPC title

• C22C18/00 Primary

  Alloys based on zinc · CPC title

• C23C2/26

  After-treatment (C23C2/14 takes precedence) · CPC title

• C22C18/04

  with aluminium as the next major constituent · CPC title