Sealant compositions
AssigneeHenkel AG & Co. KGaA
InventorsFrank D. Lesh, Andrew M. Dahl, Donald R. Vonk, Bashir M. Ahmed
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Abstract
Sealant compositions for conferring unpainted corrosion resistance to a metal surface, such as an aluminum alloy, methods for conferring corrosion resistance by applying the sealant compositions, and metal surfaces, components, and articles that have been thereby rendered corrosion resistant, wherein the sealant compositions may be substantially free of chromium (VI), permanganate, heavy metals, or lanthanide rare-earth metals, and can provide performance similar to the military Class 1A specification by conferring protection against corrosion, whether painted or unpainted.
Claims29
A sealant composition for conferring corrosion resistance on a metal surface comprising:
- a. lithium polysilicate;
- b. a corrosion inhibitor;
- and,
- c. an adhesion promoter;
- and
- d. water;
- wherein the sealant composition contains substantially no chromium (VI).
An article of manufacture comprising:
- a. a metal surface having deposited thereon a conversion coating comprising a Group IVB metal, and
- b. a sealant layer, comprising Li, Si, C and O, wherein the sealant layer is dried in place on the conversion coating.
An article of manufacture comprising a metal surface having deposited thereon a sealant layer in which lithium is distributed in an amount of about 2-7 mg/m2, as measured by glow discharge optical emission spectrometry (GD-OES).
Dependencies are inferred from the claim text.