Process for phosphatizing, rerinsing and cathodic electro-dipcoating

US6447662B1 · kind B1 · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Jan-Willem Brouwer · Willich, DE
• Bernd Schenzle · Troy, US
• Peter Kuhm · Hilden, DE
• Winfried Wichelhaus · Mettmann, DE
• Helmut Endres · Zusmarshausen, DE

Key dates

• Filing date: Apr 6, 2001
• Grant date: Sep 10, 2002
• Expiry date: Apr 6, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C28/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for pretreating surfaces made from steel, galvanised steel and/or aluminum and/or alloys thereof, wherein, in a first process stage, phosphating is performed using a low-nickel zinc phosphating solution; in a second process stage, the phosphated surfaces are post-rinsed using an aqueous solution which contains 0.001 to 10 g/l of lithium ions; copper ions and/or silver ions; and, in a third process stage, a low-lead cathodically depositable electrocoating lacquer is applied which contains no more than 0.05 wt. % of lead, relative to the dry solids content of the lacquer.