Electropolishing process

US4184932A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Michael Ahlgrim · Lechenich, DE
• Gerhard Mietens · Hürth, DE
• Helga Zygmann · Hürth, DE

Key dates

• Filing date: Sep 25, 1978
• Grant date: Jan 22, 1980
• Expiry date: Sep 25, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25F3/16
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Axially unsymmetrical articles are electropolished zonewise, or the inside and outside surfaces of articles are electropolished zonewise and simultaneously. To this end a cathode of which the geometrical configuration and surface area correspond to the surface to be electropolished is arranged opposite an anode; more particularly, the cathode is subdivided into a plurality of segments which are non-conductive with respect to one another, through which segments a current of the necessary density is alternately passed and discontinued, at intervals, for a period compatible with the production of the desired electropolishing effect.