Invention Grant
- Patent Title: Object comprising a chromium-based coating with a high Vickers hardness, production method, and aqueous electroplating bath therefor
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Application No.: US17996632Application Date: 2021-04-21
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Publication No.: US12006586B2Publication Date: 2024-06-11
- Inventor: Jussi Räisä , Arto Yli-Pentti
- Applicant: Savroc Ltd
- Applicant Address: FI Kuopio
- Assignee: Savroc Ltd
- Current Assignee: Savroc Ltd
- Current Assignee Address: FI Kuopio
- Agency: DeLizio, Peacock, Lewin & Guerra
- Priority: FI 205408 2020.04.23
- International Application: PCT/FI2021/050297 2021.04.21
- International Announcement: WO2021/214389A 2021.10.28
- Date entered country: 2022-10-20
- Main IPC: C25D3/06
- IPC: C25D3/06 ; C25D3/10 ; C25D5/00 ; C25D5/14 ; C25D3/14

Abstract:
An object comprising a chromium-based coating on a substrate is disclosed, wherein the chromium is electroplated from an aqueous electroplating bath comprising trivalent chromium cations, wherein the chromium-based coating comprises 87-98 weight-% of chromium, 0.3-5 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. Further is disclosed a method for its production, and an aqueous electroplating bath.
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