Corrosion resistant coating systems

Patent metadata

Field	Value
Publication number	US-12503776-B2
Application number	US-202418605107-A
Country	US
Kind code	B2
Filing date	Mar 14, 2024
Priority date	Aug 31, 2021
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

Aspects described herein generally relate to a method of coating a metallic surface. The method includes forming a solution including a corrosion inhibitor having one or more thiol moieties and a hydroxide. The metallic surface is coated with the solution to form a treated metallic surface. The treated metallic surface is further coated with an organosilane, an acid, and a metal alkoxide to form a coating system.

First claim

What is claimed is:

1 . A method of coating a metallic surface, comprising:
dispersing, using a high-shear mixer, a corrosion inhibitor having one or more thiol moieties in an aqueous solution; subsequently forming a salt of the corrosion inhibitor in the aqueous solution by mixing the aqueous solution with a hydroxide with a molar ratio to the corrosion inhibitor of 0.5:1 to about 4:1 until the thiol moieties are depronated and a weight of the hydroxide remains less than 10 percent of a weight of the aqueous solution; dissolving the salt until the aqueous solution becomes a solution free of insoluble particles; subsequently coating the metallic surface with the solution free of insoluble particles, an acid, and a metal alkoxide to form a treated metallic surface; partially curing, on the metallic surface, the solution free of insoluble particles; and subsequently coating the treated metallic surface with a coating comprising an organosilane to form a coating system.

2 . The method of claim 1 , wherein coating the metallic surface the coating further comprises:
applying the solution free of insoluble particles over the metallic surface; partially curing the solution free of insoluble particles between 20-23 degrees Celsius; and applying the acid and the metal alkoxide after applying the solution free of insoluble particles.

3 . The method of claim 1 , wherein the solution free of insoluble particles comprises a pH between 4 and 9.

4 . The method of claim 1 , the method further comprising curing the treated metallic surface at a pressure of about 760 Torr to about 3 Torr and a temperature of about 10° C. to about 50° C. to a thickness between 10 microns and 100 microns.

5 . The method of claim 4 , the method further comprising curing the coating system at a pressure of about 760 Torr to about 3 Torr and a temperature of about 10° C. to about 50° C.

6 . The method of claim 1 , the method further comprising curing the coating system at a pressure of about 760 Torr to about 3 Torr and a temperature of about 10° C. to about 50° C.

7 . The method of claim 1 , further comprising determining an amount of the hydroxide on a molar basis relative the thiol moieties.

8 . The method of claim 1 , wherein the coating further comprises an alcohol.

9 . The method of claim 8 , wherein the alcohol is an alkyl alcohol.

10 . The method of claim 9 , wherein the alcohol is methyl alcohol.

11 . The method of claim 1 , wherein the hydroxide is selected from a group consisting of aluminum hydroxide, sodium hydroxide, potassium hydroxide, lithium hydroxide, and any combination thereof.

12 . The method of claim 1 , wherein the organosilane is represented by Formula (I):

wherein:
each R 1 is independently selected from C1-C20 alkyl; and
R 2 is selected from a group consisting of alkyl, cycloalkyl, ether, and aryl.

13 . The method of claim 1 , wherein the organosilane is represented by Formula (II):

wherein R is selected from a group consisting of alkyl, cycloalkyl, ether, and aryl.

14 . The method of claim 13 , wherein R is ether selected from a group consisting of polyethylene glycol ether, polypropylene glycol ether, C 1-20 alkyl ether, aryl ether, and cycloalkyl ether.

15 . The method of claim 1 , wherein the metal alkoxide is selected from a group consisting of zirconium (IV) tetramethoxide, zirconium (IV) tetraethoxide, zirconium (IV) tetra-n-propoxide, zirconium (IV) tetra-isopropoxide, zirconium (IV) tetra-n-butoxide, zirconium (IV) tetra-isobutoxide, zirconium (IV) tetra-n-pentoxide, zirconium (IV) tetra-isopentoxide, zirconium (IV) tetra-n-hexoxide, zirconium (IV) tetra-isohexoxide, zirconium (IV) tetra-n-heptoxide, zirconium (IV) tetra-isoheptoxide, zirconium (IV) tetra-n-octoxide, zirconium (IV) tetra-n-isooctoxide, zirconium (IV) tetra-n-nonoxide, zirconium (IV) tetra-n-isononoxide, zirconium (IV) tetra-n-decyloxide, zirconium (IV) tetra-n-isodecyloxide, and any combination thereof.

16 . The method of claim 1 , wherein a molar ratio of acid to metal alkoxide is about 2:1 to about 6:1.

17 . The method of claim 1 , wherein the acid is acetic acid.

Assignees

• Boeing Co

Inventors

• Kinlen Patrick J
• Dillard Anthony E

Classifications

• B05D1/18

  performed by dipping · CPC title

• B05D7/50

  Multilayers · CPC title

• B05D1/02

  performed by spraying · CPC title

• B05D3/107

  Post-treatment of applied coatings · CPC title

• B05D3/0254

  After-treatment · CPC title