Tannin mannich adducts for improving corrosion resistance of metals
AssigneeHenkel Corporation
InventorsAndreas Lindert, Stephen M. Wolpert
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Abstract
A vegetable tannin is condensed with formaldehyde and an amine to provide an acid soluble product which is useful in a metal treatment solution to enhance corrosion resistance and paint adhesion characteristics of a metal surface.
Claims21
An aqueous metal treatment solution comprising from about 0.01 g/liter to about 50 g/liter of the condensation reaction product of a vegetable tannin, an aldehyde and an amine.
A process for treating a metal surface comprising the steps of contacting a metal surface with an aqueous solution comprising from about 0.1 g/liter to about 50 g/liter of the condensation reaction product of a vegetable tannin, an aldehyde, and an amine.
Dependencies are inferred from the claim text.