Adhesion of a chromium-based coating on a substrate

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United States of America Patent

PATENT NO 11795559
APP PUB NO 20230145456A1
SERIAL NO

17919688

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Abstract

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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: a first chromium-containing layer, on the substrate, having a thickness of at least 100 nm, and a Vickers microhardness value of 700-1000 HV; a second chromium-containing layer, on the first chromium-containing layer, having a Vickers microhardness value that is at least 1.3 times higher than the Vickers microhardness value of the first chromium-containing layer, and a crystal size of 8-35 nm; and wherein the chromium-based coating exhibits a critical scratch load value (LC2) of at least 60 N in the adhesion test according to ASTM C1624-05 (2015; point 11.11.4.4), and wherein the chromium-based coating does not contain chromium carbide. Further is disclosed a method for its production.

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Patent Owner(s)

Patent OwnerAddress
SAVROC LTD70620 KUOPIO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Räisä, Jussi Kuopio, FI 9 44
Yli-Pentti, Arto Klaukkala, FI 5 1

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