SURFACE-TREATED STEEL
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United States of America Patent
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Oct 3, 2024
app pub date -
Nov 22, 2022
filing date -
Nov 22, 2021
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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.
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