Sn PLATING STEEL SHEET, CHEMICAL TREATMENT STEEL SHEET, AND METHOD OF MANUFACTURING THE SAME

Patent metadata

Field	Value
Publication number	US-2017342585-A1
Application number	US-201615538421-A
Country	US
Kind code	A1
Filing date	Feb 8, 2016
Priority date	Feb 6, 2015
Publication date	Nov 30, 2017
Grant date	—

Abstract

The chemical treatment steel sheet includes a steel sheet, a mat finished Sn plating layer that is provided as an upper layer of the steel sheet and is formed of a β-Sn, and a chemical treatment layer that is provided as an upper layer of the Sn plating layer. The Sn plating layer contains the β-Sn of 0.10 g/m 2 to 20.0 g/m 2 in terms of an amount of metal Sn. A crystal orientation index of a (100) plane group of the Sn plating layer is higher than crystal orientation indexes of other crystal orientation planes. The chemical treatment layer includes a Zr compound containing Zr of 0.50 mg/m 2 to 50.0 mg/m 2 in terms of an amount of metal Zr, and a phosphate compound.

First claim

1 . A chemical treatment steel sheet comprising:
a steel sheet; a mat finished Sn plating layer that is provided as an upper layer of the steel sheet and is formed of a β-Sn; and a chemical treatment layer that is provided as an upper layer of the Sn plating layer, wherein the Sn plating layer contains the β-Sn of 0.10 g/m 2 to 20.0 g/m 2 in terms of an amount of metal Sn, wherein a crystal orientation index of a (100) plane group of the Sn plating layer is higher than crystal orientation indexes of other crystal orientation planes, and wherein the chemical treatment layer includes a Zr compound containing Zr of 0.50 mg/m 2 to 50.0 mg/m 2 in terms of an amount of metal Zr, and a phosphate compound.

2 . The chemical treatment steel sheet according to claim 1 , wherein
when a crystal orientation index of a (200) plane of the Sn plating layer is defined as X which is expressed by the following Expression (1), the X is equal to or greater than 1.0,
X =( A/B )/( C/D )  (1)

here, X: crystal orientation index A: measurement value (unit: cps) of a peak intensity of orientation plane to be obtained, B: sum (unit: cps) of measurement values of peak intensity of (200) plane, (101) plane, (211) plane, (301) plane, (112) plane, (400) plane, (321) plane, (420) plane, (411) plane, (312) plane, (501) plane, C: theoretical value (unit: cps) of peak intensity of orientation plane to be obtained by powder X-ray diffraction, D: sum (unit: cps) of theoretical values of peak intensity of (200) plane, (101) plane, (211) plane, (301) plane, (112) plane, (400) plane, (321) plane, (420) plane, (411) plane, (312) plane, (501) plane obtained by powder X-ray diffraction.

3 . A method of manufacturing a chemical treatment steel sheet, comprising:
a Sn electroplating process of forming a Sn plating layer containing a β-Sn on a steel sheet by an electroplating, wherein a current density is 10% to 50% with respect to a limiting current density; and a chemical treatment process of performing an electrolytic treatment on the steel sheet, on which the Sn plating layer is formed, to form a chemical treatment layer on the Sn plating layer in a chemical treatment bath.

4 . The method of manufacturing a chemical treatment steel sheet according to claim 3 , wherein
in the chemical treatment process, performing the electrolytic treatment on the steel sheet, on which the Sn plating layer is formed, in the chemical treatment bath including Zr ion of 10 ppm to 10,000 ppm, F ion of 10 ppm to 10,000 ppm, phosphate ion of 10 ppm to 3,000 ppm, and nitrate ion of 100 ppm to 30,000 ppm at a temperature of 5° C. to 90° C. under conditions of current density of 1.0 A/dm 2 to 100 A/dm 2 and an electrolytic treatment time of 0.2 seconds to 100 seconds.

5 . A Sn plating steel sheet comprising:
a steel sheet; and a mat finished plating layer that is provided as an upper layer of the steel sheet and is formed of a β-Sn; wherein the Sn plating layer contains the β-Sn of 0.10 g/m 2 to 20.0 g/m 2 in terms of an amount of metal Sn, and wherein a crystal orientation index of a (100) plane group of the Sn plating layer is higher than crystal orientation indexes of other crystal orientation planes.

6 . A method of manufacturing a Sn plating steel sheet, comprising:
a Sn electroplating process of forming a Sn plating layer containing a β-Sn on a steel sheet by electroplating, wherein a current density is 10% to 50% with respect to a limiting current density.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Goto Yasuto
• FUTABA Takashi

Classifications

• C25D3/30

  of tin · CPC title

• C25D3/32

  characterised by the organic bath constituents used · CPC title

• C25D5/36

  of iron or steel · CPC title

• C25D9/10 Primary

  on iron or steel · CPC title

• C25D9/08 Primary

  by cathodic processes · CPC title