Composition and process for the phosphatizing of metals

US4389260A · kind A · utility

Assignee

• Occidental Chemical Corporation · US

Inventors

• Dieter Hauffe · Frankfurt am Main, DE
• Gerhard Muller · Grafing, DE
• Werner Rausch · Hopewell Junction, US
• Josef Rothkegel · Frankfurt, DE
• Gudrun Volling · Frankfurt, DE

Key dates

• Filing date: Jan 8, 1982
• Grant date: Jun 21, 1983
• Expiry date: Jan 8, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C22/362
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A composition for the phosphatizing of metals, particularly iron and steel, which comprises an aqueous acidic, chlorate-containing zinc phosphate solution which contains PA1 from 0.5 to 1.5 g/liter Zn PA1 from 0.4 to 1.3 g/liter Ni PA1 from 10 to 26 g/liter P.sub.2 O.sub.5 PA1 from 0.8 to 5 g/liter Cl0.sub.3 and in which no nitrite is added, and in which the weight ratio of PA0 Zn to Ni shall be adjusted to a value of 1: (from 0.5 to 1.5), that of Zn to P.sub.2 O.sub.5 to a value of 1: (from 8 to 85) and that of free P.sub.2 O.sub.5 to a value of from (0.005 (at about 30 degrees C.) to 0.06 (at about 60 degrees C.)): 1. The composition is particularly useful in processes for the preparation of metal surfaces for electrophoretic coating, particularly for cathodic immersion coating.