Nonaqueous sol-gel for adhesion enhancement of water-sensitive materials
AssigneeThe Boeing Company
InventorsJames A. Moore, Daniel W. Huff, Dennis K. Kennedy
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Abstract
The present disclosure provides methods for forming sol-gels, sol-gel films and substrates, such as vehicle components, having a sol-gel film disposed thereon. At least one method of forming a sol-gel includes mixing a metal alkoxide, an acid stabilizer, and an organic solvent to form a first mixture having about 10 wt % or less water content based on the total weight of the first mixture. The method includes mixing an organosilane with the first mixture to form a second mixture having about 10 wt % or less water content based on the total weight of the second mixture.
Claims19
A method, comprising:
- mixing a zirconium alkoxide, an acid stabilizer, and an anhydrous organic solvent to form a first mixture;
- mixing an organosilane and a corrosion inhibitor with the first mixture to form a second mixture, the corrosion inhibitor comprising a disulfide group, a metal thiolate group, or a combination thereof, the organosilane represented by formula:
- wherein R is alkyl, cycloalkyl, ether, or aryl;
- incubating the second mixture at a temperature of about 30° C. to about 50° C.;
- coating a metal substrate with the second mixture to form a coated metal substrate, the metal substrate comprising a) steel or b) an alloy comprising aluminum and an optional intermetallic;
- and
- curing the coated metal substrate at a temperature of about 10° C. to about 150° C. to form a sol-gel, wherein the sol-gel has 0 wt % epoxy-silane content and 0 wt % amino-silane content, and wherein the sol-gel has a water content of 0 wt % based on a total weight of the sol-gel.
A method, comprising:
- mixing an acid stabilizer, an anhydrous organic solvent, a corrosion inhibitor, a zirconium alkoxide, and an organosilane to form a mixture, wherein the anhydrous organic solvent is selected from the group consisting of 1-pentanol, 2-pentanol, 3-pentanol, 1-hexanol, 2-hexanol, 3-hexanol, and combinations thereof, wherein a pH of the sol mixture is from 2 to 5, wherein the corrosion inhibitor comprises a disulfide group, a metal thiolate group, or a combination thereof, and wherein the organosilane is represented by formula:
- wherein R is alkyl, cycloalkyl, ether, or aryl;
- incubating the mixture at a temperature of about 30° C. to about 50° C.;
- coating a metal substrate with the mixture to form a coated metal substrate, the metal substrate comprising a) steel or b) an alloy comprising aluminum and an optional intermetallic;
- and
- curing the coated metal substrate at a temperature of about 10° C. to about 150° C. to form a sol-gel, wherein:
- the sol-gel has 0 wt % epoxy-silane content and 0 wt % amino-silane content,
- the mixture has a water content of 0 wt % based on a total weight of the mixture,
- an amount of zirconium alkoxide in the mixture is from 0.2 wt % to 5 wt %, based on the total weight of the mixture,
- an amount of organosilane in the mixture is from 0.7 wt % to 5 wt %, based on the total weight of the mixture, and
- a ratio of the zirconium alkoxide to the acid stabilizer in the mixture is from 1:1 to 3:1.
Dependencies are inferred from the claim text.