AN OBJECT COMPRISING A CHROMIUM-BASED COATING LACKING MACROCRACKS
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United States of America Patent
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Issued Date -
Jun 22, 2023
app pub date -
Apr 21, 2021
filing date -
Apr 23, 2020
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Abstract
An object comprising a chromium-based coating on a substrate is disclosed. The chromium is electroplated from an aqueous electroplating bath comprising trivalent chromium cations, wherein the chromium-based coating comprises at least one chromium-containing layer, the chromium-based coating does not contain macrocracks, wherein a macrocrack is a crack that extends from the outer surface of the chromium-based coating, through the chromium-based coating, to the substrate, the chromium-based coating has a Vickers microhardness value of 800-1100 HV, and the chromium-based coating exhibits a critical scratch load value (LC2) of at least 80 N in the adhesion test according to ASTM C1624-05 (2015; point 11.11.4.4). Further is disclosed a method for its production.
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