Pulse-modulated DC electrochemical coating process and apparatus

US6197179A · kind A · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Klaus Arlt · Senden, DE
• Karin Eckert · Münster, DE
• Margaret Stockbrink · Munster, DE
• Rolf Schulte
• Harald Berlin · Nottuln, DE
• Gerd Ulrich Nienhaus · Munster, DE

Key dates

• Filing date: Sep 17, 1997
• Grant date: Mar 6, 2001
• Expiry date: Sep 17, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S204/08
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention relates to a novel process for coating objects by means of direct current, in which process an adjustable DC voltage is pulse-modulated with an adjustable AC voltage. The process is useful for electrochemical coating of objects with resinous coating material. Preferably, the pulse modulation of the DC voltage is limited to certain time intervals during the coating process and the pulse modulation is connected and disconnected with an adjustable duty ratio.