Process for phosphating steel strip galvanized on one side

US5516372A · kind A · utility

Assignees

• Henkel Kommanditgesellschaft auf Aktien · DE
• Krupp-Hoesch-Stahl AG · DE

Inventors

• Joerg Riesop · Niederzier, DE
• Raschad Mady · Frechen, DE
• Dieter Geruhn · Werl, DE
• Frank Panter · Dortmund, DE
• Franz Ricke · Schwelm, DE
• Hubertus Peters · Dortmund, DE
• Juergen Verheien · Dortmund, DE
• Manfred Wessel · Welver, DE

Key dates

• Filing date: Apr 27, 1995
• Grant date: May 14, 1996
• Expiry date: Apr 27, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C22/184
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for phosphating a galvanized surface of a steel strip electrolytically galvanized on one side by contacting the galvanized surface of the steel strip with a phosphating solution containing 1.0 to 6 g/l zinc, 0.5 to 5.0 g/l nickel and 14 to 25 g/l phosphate at a temperature of 40.degree. to 70.degree. C. for from 2 to 20 seconds. The ungalvanized surface remains metal bright.