SURFACE-TREATED STEEL SHEET AND METHOD OF PRODUCING THE SAME
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United States of America Patent
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Issued Date -
Feb 1, 2024
app pub date -
Nov 29, 2021
filing date -
Dec 21, 2020
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Abstract
It is provided a surface-treated steel sheet that can be produced without using hexavalent chromium and has excellent film wet adhesion and coating secondary adhesion as well as high film corrosion resistance and coating corrosion resistance. It is a surface-treated steel sheet having: a steel sheet; a metallic Cr layer disposed on at least one surface of the steel sheet; and a Cr oxide layer disposed on the metallic Cr layer, and the surface-treated steel sheet has a water contact angle of 50° or less and a total atomic ratio of K, Na, Mg, and Ca adsorbed on the surface to Cr of 5% or less.
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