Non-chromate corrosion inhibitor formulas based on zirconium vanadium oxide compositions
AssigneeThe Shepherd Color Company
InventorSimon Boocock
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Abstract
A mixture of zirconium hydroxides or zirconium basic carbonate with vanadium oxide (V205) co-reacts in high temperature aqueous slurry to form respectively an amorphous material, believed to be based on a zirconium analog of a zeolite structure, and a solid solution of zirconium oxide with vanadium oxide. The subject compositions, free of hexavalent chromium, are highly effective in providing blister-free corrosion prevention in typical coil and aerospace grade epoxy primer and color coat combinations.
Claims17
An amorphous zirconium vanadium oxide/hydroxide product, having a formula of from Zr2V3O12.nH2O to Zr3V4O16.nH2O, wherein n is from 0 to 6, substantially free of salts selected from hexavalent chromium salts, alkali metal chlorides, alkali metal nitrates, alkali metal sulfates, and mixtures thereof.
An amorphous product made by a reaction of zirconium hydroxide or zirconium basic carbonate with vanadium oxide in a high temperature aqueous slurry, wherein the reaction is carried out at a temperature between about 65° C. and about 130° C., and a pressure between ambient and about 5 MPa.
Dependencies are inferred from the claim text.