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

Patent metadata

Field	Value
Publication number	US-11939693-B2
Application number	US-202117352059-A
Country	US
Kind code	B2
Filing date	Jun 18, 2021
Priority date	Jan 26, 2015
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

There is provided a surface-treated steel sheet ( 1 ) comprising: a tin-plated steel sheet ( 10 ) obtained by tin-plating a steel sheet ( 11 ); a phosphate compound layer ( 20 ) containing tin phosphate formed on the tin-plated steel sheet ( 10 ); and an aluminum-oxygen compound layer ( 30 ) on the phosphate compound layer ( 20 ), a main constituent of the aluminum-oxygen compound layer ( 30 ) being an aluminum-oxygen compound; wherein, when the 3d 5/2 spectrum of tin in the aluminum-oxygen compound layer ( 30 ) is determined using an X-ray photoelectron spectroscopy, the ratio of the integration value of the profile derived from tin oxide to the integration value of the profile derived from tin phosphate (tin oxide/tin phosphate) is 6.9 or more.

First claim

The invention claimed is:

1. A method for producing a surface-treated steel sheet comprising:
forming a phosphate compound layer on a tin-plated steel sheet by means of cathode electrolytic treatment, wherein the tin-plated steel sheet is obtained by tin-plating a steel sheet; and
forming an aluminum-oxygen compound layer on the phosphate compound layer by means of electrolytic treatment using an electrolytic treatment liquid containing aluminum,
wherein the electrolytic treatment liquid has a phosphate content of 0.11 g/L or less in terms of phosphorus atom and an aluminum ion content of 1 to 10 g/L in terms of aluminum atom,
the electrolytic treatment for forming the aluminum-oxygen compound layer is performed by an intermittent electrolysis method where a cycle of energization and stop of energization is repeated, and
a total energization time for forming the aluminum-oxygen compound layer is 1.5 seconds or less.

2. The method for producing a surface-treated steel sheet according to claim 1 , wherein the phosphate compound layer is formed on the tin-plated steel sheet by means of the cathode electrolytic treatment after anode electrolytic treatment is conducted.

3. The method for producing a surface-treated steel sheet according to claim 1 , wherein the phosphate compound layer is formed by immersing the tin-plated steel sheet in a treatment liquid containing phosphate ions to generate divalent tin ions from dissolved tin of the tin-plated steel sheet, and performing the cathode electrolytic treatment so that the divalent tin ions react with the phosphate ions so as to be deposited on the tin-plated steel sheet as tin phosphate.

Assignees

• Toyo Kohan Co Ltd

Inventors

• Yoshimura Kunihiro
• Matsubara Masanobu
• Sasaki Marie
• Yoshida Akihiro
• Yanada Kenji
• Hirotsu Munemitsu

Classifications

• C25D9/12 Primary

  on light metals · CPC title

• B32B9/00

  Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• B32B15/043

  of metal (B32B15/01 takes precedence) · CPC title

• B32B15/08

  of synthetic resin · CPC title