Surface-treated steel

Patent metadata

Field	Value
Publication number	US-12559830-B2
Application number	US-202218708525-A
Country	US
Kind code	B2
Filing date	Nov 22, 2022
Priority date	Nov 22, 2021
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

The surface-treated steel includes: a steel; a plated layer containing Zn or a Zn alloy formed on a surface of the steel; and a chemical conversion coating film formed on a surface of the plated layer, wherein the chemical conversion coating film contains an organosilicon compound having a siloxane bond, and P and F, and when the abundance ratio of an alkylene group and a siloxane bond in the organosilicon compound is measured by Fourier transform infrared spectroscopy (FT-IR), a ratio A1/A2 of a peak value A1 of an absorbance at 2,800 to 3,000 cm −1 indicating the alkylene group to a peak value A2 of an absorbance at 1,030 to 1,200 cm −1 indicating the siloxane bond is 0.10 to 0.75.

First claim

What is claimed is:

1 . A surface-treated steel comprising:
a steel; a plated layer containing Zn or a Zn alloy formed on a surface of the steel; and a chemical conversion coating film formed on a surface of the plated layer,
wherein
the chemical conversion coating film contains P, F, and an organosilicon compound having a siloxane bond,
an abundance ratio of an alkylene group and the siloxane bond in the organosilicon compound is measured by Fourier transform infrared spectroscopy (FT-IR) at a resolution of 4 cm −1 in an air atmosphere, and
a ratio A1/A2 of a peak value A1 of an absorbance at 2,800 to 3,000 cm −1 , indicating the alkylene group, to a peak value A2 of an absorbance at 1,030 to 1,200 cm −1 , indicating the siloxane bond, is 0.10 to 0.75.

2 . The surface-treated steel according to claim 1 , wherein
an abundance ratio of a phosphate group in the chemical conversion coating film and the siloxane bond in the organosilicon compound is measured by FT-IR at a resolution of 4 cm −1 in an air atmosphere, and a ratio A3/A2 of an absorbance A3 of the phosphate group at 1,200 cm −1 to the peak value A2 of the absorbance at 1,030 to 1,200 cm −1 , indicating the siloxane bond, is 0.43 to 1.00.

3 . The surface-treated steel according to claim 1 , wherein
an adhesion amount of the plated layer is 10 to 200 g/m 2 per one surface and an adhesion amount of the chemical conversion coating film is 100 to 2000 mg/m 2 per one surface.

Assignees

• Nippon Steel Corp

Inventors

• Nishida Yoshikatsu
• Shimizu Atsuo
• Ueno Shin
• Shoji Hiromasa

Classifications

• B32B15/18

  comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} · CPC title

• C23C18/122

  Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes · CPC title

• Y10T428/12799

  Next to Fe-base component [e.g., galvanized] · 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

• B32B15/013

  one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium · CPC title