Electrolyte for chromium deposition from Cr(III)-compounds

US11932958B2 · kind B2 · utility

Assignee

• Universitaet Ulm · DE

Inventors

• Yasser Sheasha · Ulm, DE
• Ludwig Kibler · Hochdorf, DE
• Timo Jacob · Framersheim, DE

Key dates

• Filing date: Nov 2, 2021
• Grant date: Mar 19, 2024
• Expiry date: Dec 6, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/10
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for preparing a Cr(III)-plating solution is disclosed. The method comprises or consists of the steps of (a) providing an aged aqueous Cr(III)-solution; (b) adding a polycarbonate or a derivative thereof to the solution of step (a); and (c) adding a borate to the solution of step (b). In addition, a plating solution obtainable by the present method is disclosed, and a plating solution comprising or consisting of Cr(III)-ions, a polycarbonate or a derivative thereof, a borate, water, sulfate, and positive ions selected from the group consisting of hydrogen ions, alkali metal ions and earth alkali metal ions.