Anti-corrosion pigments

US4156613A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Franz Hund · Krefeld, DE
• Gunter Linde · Krefeld, DE
• Peter Kresse · Krefeld, DE

Key dates

• Filing date: May 12, 1977
• Grant date: May 29, 1979
• Expiry date: May 12, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2002/52
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A pigment of high anti-corrosion properties comprises PA1 (a) about 30 to 70 mole percent of at least one of MgO, ZnO and CaO, and PA1 (b) about 70 to 30 mole percent of Me.sub.2 O.sub.3 wherein Me.sub.2 O.sub.3 has the approximate molar percent composition PA2 Fe.sub.2 O.sub.3 : 0-100, preferably 0.5-100, most preferably 1-95, mole % PA2 Al.sub.2 O.sub.3 +Mn.sub.2 O.sub.3 : 0-100, preferably 0.5-100, most preferably 1-95, mole % PA2 Cr.sub.2 O.sub.3 : 0-20 mole % Is produced by calcining such oxides or compounds yielding such oxides at from about 200.degree. .RTM. to 650.degree. C. with the option of going up to about 950.degree. C. if the Al+Mn+Cr oxides total 10 mole % or more.