Zinc chromium chromate pigment
OwnerLouis Schiffmaninventor
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Abstract
Zinc oxide is interacted with an aqueous solution containing a chromium chromate complex obtained through partial reduction of an aqueous solution of chromic acid with an organic reducing agent. The resulting product is dried and the residual solid ground to suitable size for use as a pigment.
Claims10
A zinc chromium chromate corrosion inhibiting pigment wherein the mol ratio of zinc oxide to total chromium oxides is about in the range of 5:1 to 1:3 and 5 to 70% of the total chromium content is present in trivalent state.
The method of preparing a corrosion-inhibiting pigment powder comprising a complex of zinc and chromium chromate which method comprises interacting zinc oxide with a preformed complex of trivalent and hexavalent chromium, in aqueous solution, drying the obtained reaction product and thereafter grinding the same to a powder.
Dependencies are inferred from the claim text.