Chemical treatment steel sheet, and method for producing chemical treatment steel sheet

Patent metadata

Field	Value
Publication number	US-2019226112-A1
Application number	US-201916370045-A
Country	US
Kind code	A1
Filing date	Mar 29, 2019
Priority date	Oct 9, 2014
Publication date	Jul 25, 2019
Grant date	—

Abstract

Provided is a chemical treatment steel sheet including a steel sheet; a composite coated layer which is formed on at least one surface of the steel sheet, and contains 2 to 200 mg/m2 of Ni in terms of an amount of metal Ni and 0.1 to 10 g/m2 of Sn in terms of an amount of metal Sn, and in which an island-shaped Sn coated layer is formed on an Fe—Ni—Sn alloy layer; and a chemical treatment layer that is formed on the composite coated layer, and contains a 0.01 to 0.1 mg/m2 of Zr compounds in terms of an amount of metal Zr and 0.01 to 5 mg/m2 of phosphate compounds in terms of an amount of P.

First claim

What is claimed is:

1 . A method for producing a chemical treatment steel sheet, comprising:
a plating process that forms an Ni coated layer that contains 2 to 200 mg/m 2 of Ni in terms of an amount of metal Ni and an Sn coated layer that contains 0.1 to 10 g/m 2 of Sn in terms of an amount of metal Sn on a surface of a steel sheet; a reflow process that forms an Fe—Ni—Sn alloy layer on the steel sheet and an island-shaped Sn coated layer on the Fe—Ni—Sn alloy layer by performing a reflow treatment with respect to the steel sheet in which the Ni coated layer and the Sn coated layer are formed; and a chemical treatment process that forms a chemical treatment layer on the island-shaped Sn coated layer by performing an electrolytic treatment in a chemical treatment liquid, which contains equal to or greater than 10 ppm and less than 500 ppm of Zr ions, 10 to 20000 ppm of F ions, 10 to 3000 ppm of phosphate ions, and 100 to 30000 ppm in a total amount of nitrate ions and sulfate ions and of which a temperature is set to equal to or higher than 5° C. and lower than 90° C., under conditions of a current density of 0.5 to 20 A/dm 2 and an electrolytic treatment time of 0.05 to 10 seconds, or by performing an immersion treatment in the chemical treatment liquid for an immersion time of 0.2 to 100 seconds.

2 . The method for producing a chemical treatment steel sheet according to claim 1 ,
wherein the chemical treatment liquid contains 100 ppm to less than 500 ppm of Zr ions, 100 to 17000 ppm of F ions, 20 to 2000 ppm of phosphate ions, and 1000 to 20000 ppm in a total amount of nitrate ions and sulfate ions.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Tani Yoshiaki
• Hirano Shigeru
• Tachiki Akira
• Yanagihara Morio
• Kawabata Makoto
• Yokoya Hirokazu

Classifications

• Y10T428/12958

  Next to Fe-base component · CPC title

• C25D5/50

  by heat-treatment · CPC title

• C23C28/34

  including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates · CPC title

• C23C10/60

  After-treatment · CPC title

• Y10T428/12944

  Ni-base component · CPC title