Electroplating bath and method for producing dark chromium layers

US9689081B2 · kind B2 · utility

Assignee

• Atotech Deutschland GmbH & Co. KG · DE

Inventors

• Klaus Schulz · Berlin, DE
• Philipp Wachter · Berlin, DE
• Philip Hartmann · Berlin, DE

Key dates

• Filing date: Apr 27, 2012
• Grant date: Jun 27, 2017
• Expiry date: Jan 14, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/08
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to methods and plating baths for electrodepositing a dark chromium layer on a workpiece. The trivalent chromium electroplating baths comprise sulphur compounds and the methods for electrodepositing a dark chromium layer employ these trivalent chromium electroplating baths. The dark chromium deposits and workpieces carrying dark chromium deposits are suited for application for decorative purposes.