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 29, 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 sulfide staining resistance and coating secondary adhesion. It is a surface-treated steel sheet having: a Sn plating layer; a metallic Cr layer disposed on the Sn plating layer; and a Cr oxide layer disposed on the metallic Cr layer, on at least one surface of a steel sheet, 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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