Corrosion-inhibiting pigment and paint composition

US4337092A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Klaus Hestermann · Lechenich, DE
• Alexander Maurer · Hürth, DE
• Joachim Kandler · Lechenich, DE
• Gerhard Mietens · Hürth, DE
• Herbert Beumling · Bensberg, DE

Key dates

• Filing date: Oct 3, 1980
• Grant date: Jun 29, 1982
• Expiry date: Oct 3, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/084
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a corrosion-inhibiting active pigment for use in the surface protection of iron and iron alloys. The pigment consists of a mixture of calcium hydrogen phosphate dihydrate, magnesium hydrogen phosphate trihydrate and zinc oxide. More specifically, the mixture contains 2 to 98 weight % of ZnO and 98 to 2 weight % of phosphate components. These in turn contain 3 to 97 weight % of CaHPO.sub.4 .multidot.2 H.sub.2 O and 97 to 3 weight % of MgHPO.sub.4 .multidot.3 H.sub.2 O. The active pigment is suitable for use in painting compositions or lacquers.