Iron oxide-based anti-corrosion pigments

Details Iron oxide-based anti-corrosion pigments Iron oxide-based anti-corrosion pigments

1976-08-11

1979-02-20

Rutledge, L. Dewayne

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106288B, 106296, 106302, 106 1405, C04B 3102

Patent

active

041405382

ABSTRACT:
An anti-corrosion pigment comprising about 30 to 70 mole % of an oxide of at least one metal selected from the group consisting of magnesium, calcium and zinc, about 70 to 30 mole % of Fe.sub.2 O.sub.3, and up to about 20 mole % of Cr.sub.2 O.sub.3, the pigment having a specific surface of about 1 to 30 m.sup.2 /g and exhibiting a weight loss of less than about 0.05% per gram of pigment by the Thomson corrosion test, is produced by calcining the corresponding metal oxides. The temperature is about 200 to 650.degree. C. in the absence of chromium and about 200 to 900.degree. C. when chromium is present.

REFERENCES:
patent: 2502130 (1950-03-01), Downs et al.

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