Sol-gel coating method and composition
AssigneeThe Boeing Company
InventorsKay Y. Blohowiak, Jacob W. Grob, Joseph H. Osborne
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Abstract
A coating composition and a method for coating metallic substrates, such as aircraft components exposed to elevated temperatures and/or oxidative conditions. The coating composition includes an aqueous mixture having about 2 vol % to about 50 vol % organosilane, about 0.3 to about 25 vol % metal alkoxide, and about 0.1 to about 30 vol % organic complexing agent. The coating composition may be deposited on a metallic substrate and cured to form a sol-gel coating on the surface of the substrate that is adherent to the substrate, and oxidation and discoloration resistant.
Claims31
A component comprising a substrate and a composition comprising a reaction product of:
- about 2 vol % to about 50 vol % of an organosilane;
- about 0.3 vol % to about 25 vol % of a metal alkoxide;
- and
- greater than about 0.1 vol % of an organic complexing agent;
- wherein a ratio of metal alkoxide to organic complexing agent is about 2:1 by volume percent,
- wherein the composition is applied on the substrate between about 1 micron and about 10 microns in thickness.
A method of forming an aqueous sol-gel coating composition for coating a metallic aircraft component, comprising:
- curing a mixture comprising 3-glycidoxypropyltrimethoxysilane, zirconium n-propoxide, and an organic complexing agent at about 180° F., wherein a ratio of zircomium n-propoxide to organic complexing agent is about 2:1 by volume percent.
A method of forming a composition, comprising:
- forming a reaction mixture by mixing:
- about 2 vol % to about 50 vol % of an organosilane,
- about 0.3 vol % to about 25 vol % of a metal alkoxide, and
- greater than about 0.1 vol % of an organic complexing agent,
- wherein a ratio of metal alkoxide to organic complexing agent is about 2:1 by volume percent;
- and
- curing the reaction mixture at about 180° F. to form one or more reaction products.
Dependencies are inferred from the claim text.