Iron phosphating using substituted monocarboxylic acids

US5919318A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Karl-Dieter Brands · Goldkronach, DE
• Melita Krause · Goldkronach, DE
• Bernd Mayer · Graz, AT
• Thomas Molz · Hilden, DE
• Annette Willer · Neuss, DE

Key dates

• Filing date: Sep 9, 1997
• Grant date: Jul 6, 1999
• Expiry date: Sep 9, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C22/44
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Described are a concentrate, a working solution and a process for iron phosphating of metals, in which the solution contains nitrobenzene sulfonic acid and substituted short-chain monocarboxylic acids of the amino acid and/or hydroxycarboxylic acid type as the accelerators.