Treatment of conversion-coated metal substrates with preformed reaction products of catechol compounds and functionalized co-reactant compounds
AssigneeHenkel AG & Co. KGaA
InventorsDonald Robb Vonk, Louis Patrick Rector
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Abstract
The corrosion resistance of conversion-coated metal substrate surfaces is further enhanced by treating such surfaces with aqueous mixtures of preformed reaction products obtained by reacting catechol compounds, such as dopamine or a dopamine salt, and functionalized co-reactant compounds, such as a polyethyleneimine.
Claims21
A method, comprising contacting a surface of a conversion-coated metal substrate with an aqueous mixture comprised of at least one preformed reaction product of at least one catechol compound and at least one co-reactant compound comprised of one or more functional groups reactive with the at least one catechol compound to provide a sealed conversion-coated metal substrate.
An article comprising a metal substrate, a conversion coating layer on at least one surface of the metal substrate, and a seal layer comprised of at least one preformed reaction product of at least one catechol compound and at least one co-reactant compound comprised of one or more functional groups reactive with the at least one catechol compound deposited on the conversion coating layer.
Dependencies are inferred from the claim text.