Surface-treated steel sheet, organic resin coated metal container, and method for producing surface-treated steel sheet

Patent metadata

Field	Value
Publication number	US-10934629-B2
Application number	US-201715678884-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Sep 25, 2013
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

Provided is a surface-treated steel sheet with a compound layer containing F and composed essentially or Zr at least on one surface thereof, wherein the Zr amount is 80 to 350 mg/m 2 and the F amount is 0.5 to 10 mg/m 2 within the layer, and an organic resin coated metal container manufactured using the surface-treated steel sheet. The surface-treated steel sheet of the present invention is manufactured through forming a layer having the Zr amount of 80 to 350 mg/m 2 at least on one surface of a steel sheet by cathode electrolytic treatment in an aqueous solution containing a Zr ion and F ion, and subsequently adjusting the surface to control the F amount to 0.5 to 10 mg/m 2 by one or more treatments selected from immersion and spraying with an ion-containing aqueous solution and cathode electrolytic treatment in the ion-containing aqueous solution.

First claim

What is claimed is:

1. A method for producing a surface-treated steel sheet having a compound layer containing fluorine and zirconium at least on one surface of a steel sheet, the method comprising:
forming a layer wherein a zirconium amount within the layer is 80 to 350 mg/m 2 by performing a cathode electrolytic treatment to the steel sheet in an aqueous solution containing a zirconium ion and fluorine ion; and
adjusting a surface to control a fluorine amount within the layer to 0.5 to 10 mg/m 2 by performing any one or more treatments selected from immersion to an ion-containing aqueous solution for 0.5 to 5 seconds, spraying of the ion-containing aqueous solution for 0.5 to 5 seconds, and cathode electrolytic treatment in the ion-containing aqueous solution for 0.5 to 5 seconds,
wherein the ion-containing aqueous solution is at least one selected from the group consisting of a solution comprising Na 2 CO 3 and NaOH, a solution comprising Na 2 CO 3 and HNO 3 , a solution comprising NH 4 OH and NH 4 Cl, and a solution comprising NaOH and Na 2 HPO 4 .

2. The method for producing a surface-treated steel sheet according to claim 1 , wherein a pH of the ion-containing aqueous solution in adjusting the surface is 9 or more.

3. The method for producing a surface-treated steel sheet according to claim 1 , further comprising performing spraying and/or immersion with warm water or hot water of 40° C. to 95° C. to the steel sheet after the treatments selected from immersion to the ion-containing aqueous solution, spraying of the ion-containing aqueous solution, and cathode electrolytic treatment in the ion-containing aqueous solution.

4. The method for producing a surface-treated steel sheet according to claim 1 , the treatments selected from immersion to the ion-containing aqueous solution, spraying of the ion-containing aqueous solution, and cathode electrolytic treatment in the ion-containing aqueous solution are performed at a temperature of 40° C. to 60° C.

5. The method for producing a surface-treated steel sheet according to claim 1 , the treatments selected from immersion to the ion-containing aqueous solution, spraying of the ion-containing aqueous solution, and cathode electrolytic treatment in the ion-containing aqueous solution are performed for 0.5 to 3 seconds.

6. The method for producing a surface-treated steel sheet according to claim 1 , wherein the zirconium amount of the compound layer containing fluorine and zirconium is 94 to 350 mg/m 2 .

7. The method for producing a surface-treated steel sheet according to claim 1 , further comprising forming an organic resin layer on the compound layer of the surface-treated steel sheet.

Assignees

• Toyo Kohan Co Ltd
• Toyo Seikan Group Holdings Ltd

Inventors

• Yoshimura Kunihiro
• Taguchi Naomi
• Fukutomi Satoko
• Kurokawa Wataru
• Hirotsu Munemitsu
• Aihara Mitsuhide
• Mikami Satoshi

Classifications

• C25D9/10 Primary

  on iron or steel · CPC title

• C25D7/00 Primary

  Electroplating characterised by the article coated · CPC title

• C25D3/54

  of metals not provided for in groups C25D3/04 - C25D3/50 · CPC title

• C25D21/12

  Process control or regulation (controlling or regulating in general G05) · CPC title