Surface-treated steel
AssigneeNippon Steel Corporation
InventorsYoshikatsu Nishida, Atsuo Shimizu, Shin Ueno, Hiromasa Shoji
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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.
Claims3
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.
Dependencies are inferred from the claim text.