Method and apparatus for electrochemical machining

US4504370A · kind A · utility

Assignee

• Audi NSU Auto Union Aktiengesellschaft · DE

Inventors

• Horst Lindner · Ingolstadt, DE
• Peter Ufer · Ingolstadt, DE
• Klaus Heck · Hohenacker, DE
• Gerhard Schmoger · Ingolstadt, DE

Key dates

• Filing date: Feb 3, 1984
• Grant date: Mar 12, 1985
• Expiry date: Feb 3, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S204/13
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The disclosure relates to a process and apparatus for the treatment of sodium-nitrate-containing electrolytes during the electrochemical machining of the surfaces of iron-containing workpieces. By adding an oxidizing agent, more particularly ozone, increased production of nitrite in the electrolyte is prevented and, thereby, premature passivation of the surface of the workpiece during the electrochemical metal removal. An apparatus for the oxidation of the electrolyte is comprised of a processing station inserted into the electrolyte circuit, an ozone generator, and a reactor.