Surface-treated steel sheet

Patent metadata

Field	Value
Publication number	US-2016368243-A1
Application number	US-201515110920-A
Country	US
Kind code	A1
Filing date	Jan 28, 2015
Priority date	Jan 28, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

A surface-treated steel sheet of the present invention includes: a base steel sheet; a surface treatment layer which is formed on at least one surface of the base steel sheet and includes an oxide layer and a metal layer; and a chemical conversion layer which is formed on a surface of the surface treatment layer. The surface treatment layer contains Zn in an adhered amount of 0.30 g/m 2 to 2.00 g/m 2 and Ni in an adhered amount of 0.03 g/m 2 to 2.00 g/m 2 , which is equal to or lower than the adhered amount of Zn. In a case of performing a glow discharge spectrometry, at an interface between the oxide layer and the metal layer, an emission intensity of Fe atoms is 20% or less of the maximum emission intensity of the Fe atoms, and the emission intensity of Ni atoms is 20% or less of the maximum emission intensity of the Ni atoms. In addition, a first range in which the emission intensity of Zn atoms is 60% or higher of the maximum emission intensity of the Zn atoms and a second range in which the emission intensity of the Ni atoms is 60% or higher of the maximum emission intensity of the Ni atoms overlap.

First claim

What is claimed is:

1 . A surface-treated steel sheet comprising:
a base steel sheet; a surface treatment layer which is formed on at least one surface of the base steel sheet and includes an oxide layer and a metal layer; and a chemical conversion layer which is formed on a surface of the surface treatment layer, wherein the surface treatment layer contains Zn in an adhered amount of 0.30 g/m 2 to 2.00 g/m 2 and Ni in an adhered amount of 0.03 g/m 2 to 2.00 g/m 2 , which is equal to or lower than the adhered amount of Zn, in a case where distribution curves of emission intensities of Fe atoms, Zn atoms, and Ni atoms are obtained respectively by performing a glow discharge spectrometry in a range from a surface of the chemical conversion layer, which is used as a measurement start position, to a position at 1 μm from the surface of the surface treatment layer in a depth direction, which is used as a measurement end position, the emission intensity of the Fe atoms at an interface between the oxide layer and the metal layer is 20% or less of a maximum emission intensity of the Fe atoms, the emission intensity of the Ni atoms at the interface is 20% or less of a maximum emission intensity of the Ni atoms, and a first range in which the emission intensity of the Zn atoms is 60% or higher of a maximum emission intensity of the Zn atoms and a second range in which the emission intensity of the Ni atoms is 60% or higher of the maximum emission intensity of the Ni atoms overlap in the depth direction.

2 . The surface-treated steel sheet according to claim 1 ,
wherein, in a case where measurement data which represents a correspondence relationship between a diffracted X-ray intensity and a diffraction angle 2θ is obtained by performing an X-ray diffraction analysis on the surface treatment layer, a peak of the diffracted X-ray intensity is present in at least one of a range of the diffraction angles 2θ between 39.6° and 40.3° and a range of the diffraction angles 2θ between 78.7° and 79.2°.

3 . The surface-treated steel sheet according to claim 1 ,
wherein the adhered amount of Zn in the surface treatment layer is 0.80 g/m 2 to 1.20 g/m 2 , and the adhered amount of Ni in the surface treatment layer is equal to or higher than 0.07 g/m 2 and is equal to or lower than half of the adhered amount of Zn.

4 . The surface-treated steel sheet according to claim 1 ,
wherein the surface treatment layer further contains Sn in an adhered amount of 10% or lower of the adhered amount of Zn.

5 . The surface-treated steel sheet according to claim 1 ,
wherein an average thickness of the surface treatment layer is 0.30 μm or smaller.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Takahashi Takehiro
• Ishizuka Kiyokazu

Classifications

• C25D3/30

  of tin · CPC title

• C22C38/004

  Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title

• B32B2457/00

  Electrical equipment · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C38/14

  containing titanium or zirconium · CPC title