	US 12,006,586 B2
	Object comprising a chromium-based coating with a high Vickers hardness, production method, and aqueous electroplating bath therefor
Jussi Räisä, Kuopio (FI); and Arto Yli-Pentti, Klaukkala (FI)
Assigned to Savroc Ltd, Kuopio (FI)
Appl. No. 17/996,632
Filed by Savroc Ltd, Kuopio (FI)
PCT Filed Apr. 21, 2021, PCT No. PCT/FI2021/050297 § 371(c)(1), (2) Date Oct. 20, 2022, PCT Pub. No. WO2021/214389, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 20205408 (FI), filed on Apr. 23, 2020.
Prior Publication US 2023/0129051 A1, Apr. 27, 2023
Int. Cl. C25D 3/06 (2006.01); C25D 3/10 (2006.01); C25D 5/00 (2006.01); C25D 5/14 (2006.01); C25D 3/14 (2006.01)

CPC C25D 3/06 (2013.01) [C25D 3/10 (2013.01); C25D 5/14 (2013.01); C25D 5/617 (2020.08)]

5 Claims

1. An object comprising:

a chromium-based coating on a substrate, wherein chromium of the chromium-based coating is electroplated from an aqueous electroplating bath comprising trivalent chromium cations, wherein the chromium-based coating comprises 87-98 weight-% of chromium, 0.3-3 weight-% of carbon, and 0.1-11 weight-% of nickel and/or iron, and wherein the chromium-based coating has a Vickers microhardness value of 1000-2000 HV, and wherein the chromium-based coating does not contain chromium carbide.