Organosiloxane-based surface treatments for enhancing the adhesion and lubricity of metal surfaces
AssigneeThe Boeing Company
InventorsDaniel W. Huff, James A. Moore, Justin J. Robertson, Gregory T. Strawder
Life of this patent
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Abstract
Compositions for treating a substrate to provide increased lubricity to portions of the substrate surface that come into contact with the surface of a mating component are provided. The treated substrates provide improved lubricity, while maintaining adhesion between the surface of the substrate and an overlying polymer coating and imparting corrosion resistance to the substrate surface. The compositions include a silanol coupling agent in combination with lubricating particles, and an acid, which are dissolved or dispersed in a mixture of organic solvent and water.
Claims17
A composition comprising:
- water;
- one or more organic solvents;
- one or more silanol coupling agents dissolved in the water and the one or more organic solvents;
- lubricating particles;
- a dichromate salt;
- and
- one or more acids, wherein the composition has a pH of 7 or lower,
- wherein the concentration of silanol coupling agent in the composition is in the range from 20 wt. % to 70 wt. %, based on the solids content of the composition, the concentration of lubricating particles in the composition is in the range from 10 wt. % to 80 wt. %, based on the solids content of the composition, and the concentration of the dichromate salt in the composition is in the range from 0.1 wt. % to 10 wt. %, based on the solids content of the composition.
A method of treating a surface (305) of a substrate (304), the method comprising:
- applying a composition to the surface (305) of the substrate (304), the composition comprising:
- water;
- one or more organic solvents;
- one or more silanol coupling agents dissolved in the water and the one or more organic solvents;
- lubricating particles;
- a dichromate salt;
- and
- one or more acids, wherein the composition has a pH of 7 or lower,
- wherein the concentration of silanol coupling agent in the composition is in the range from 20 wt. % to 70 wt. %, based on the solids content of the composition, the concentration of lubricating particles in the composition is in the range from 10 wt. % to 80 wt. %, based on the solids content of the composition, and the concentration of the dichromate salt in the composition is in the range from 0.1 wt. % to 10 wt. %, based on the solids content of the composition;
- drying and curing the applied composition to form a sol-gel film (302) on the surface (305) of the substrate (306);
- and
- applying an organic coating (306) over the sol-gel film (302).
Dependencies are inferred from the claim text.