Corrosion resistant adhesive sol-gel

Patent metadata

Field	Value
Publication number	US-10508205-B2
Application number	US-201715414150-A
Country	US
Kind code	B2
Filing date	Jan 24, 2017
Priority date	Jan 24, 2017
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

Aspects described herein generally relate to a sol-gel that is the reaction product of a hydroxy organosilane, a metal alkoxide, an acid stabilizer, and a corrosion inhibitor. The hydroxy organosilane is represented by Formula (I):

wherein R is selected from alkyl, cycloalkyl, ether, and aryl. The acid stabilizer is at a molar ratio of acid stabilizer to metal alkoxide of 1:1 or greater and the sol-gel has a pH from about 3 to about 4.

First claim

What is claimed is:

1. A sol-gel comprising:
a corrosion inhibitor having one or more thiol moieties; and
a reaction product of:
a hydroxy organosilane represented by Formula (I):

wherein R is C 1-20 alkyl, cycloalkyl, ether, or aryl;
a metal alkoxide; and
an acid stabilizer,
wherein:
the sol-gel has a pH from about 3 to about 4, and
a molar ratio of acid stabilizer to metal alkoxide is from about 4:1 to about 6:1.

2. The sol-gel of claim 1 , wherein R is C 1-20 alkyl selected from the group consisting methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, and icosanyl.

3. The sol-gel of claim 1 , wherein R is C 1-10 alkyl.

4. The sol-gel of claim 1 , 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.

5. The sol-gel of claim 4 , wherein R is selected from a group consisting of:

wherein n is a positive integer.

6. The sol-gel of claim 5 , wherein the hydroxy organosilane is:

7. The sol-gel 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 mixtures thereof.

8. The sol-gel of claim 1 , wherein the corrosion inhibitor is represented by the formula: R 1 —S n —X—R 2 , wherein R 1 is an organic group, n is a positive integer, X is a sulfur or a metal atom, and R 2 is an organic group.

9. The sol-gel of claim 1 , wherein the corrosion inhibitor is a thiadiazole.

10. The sol-gel of claim 1 , wherein the corrosion inhibitor is represented by formula (II) or formula (III):

11. The sol-gel of claim 10 , wherein the acid stabilizer is acetic acid.

12. The sol-gel of claim 1 , wherein a weight fraction of a sum of metal alkoxide, hydroxy organosilane, and acid stabilizer in the sol-gel is at least 4 wt %.

13. The sol-gel of claim 1 , wherein a weight fraction of corrosion inhibitor in the sol-gel is at least 1 wt %.

14. The sol-gel of claim 13 , wherein the weight fraction of corrosion inhibitor in the sol-gel is at least 10 wt %.

15. A sol-gel comprising:
a corrosion inhibitor having one or more thiol moieties; and
a reaction product of:
a hydroxy organosilane represented by Formula (I):

wherein R is C 1-20 alkyl, cycloalkyl, ether, or aryl;
a metal alkoxide; and

an acid stabilizer at a molar ratio of acid stabilizer to metal alkoxide of 1:1 or greater and the sol-gel has a pH from about 3 to about 4,
wherein the weight fraction of the sum of metal alkoxide, hydroxy organosilane, and acid stabilizer in the sol-gel is at least 15 wt %.

16. A vehicle component comprising:
a sol-gel coating system, comprising:
a metal substrate; and
the sol-gel of claim 1 disposed on the metal substrate.

17. The vehicle component of claim 16 , further comprising a secondary layer disposed on the sol-gel.

18. The vehicle component of claim 16 , wherein the vehicle component is selected from the group consisting an auxiliary power unit, a nose of an aircraft, a fuel tank, a tail cone, a panel, a coated lap joint between two or more panels, a wing-to-fuselage assembly, a structural aircraft composite, a fuselage body-joint, a wing rib-to-skin joint, and an internal component.

19. The vehicle component of claim 16 , wherein the metal substrate is selected from the group consisting aluminum, aluminum alloy, nickel, iron, iron alloy, steel, titanium, titanium alloy, copper, copper alloy, and mixtures thereof.

20. The vehicle component of claim 17 , wherein the secondary layer is an epoxy coating or urethane coating.

21. The vehicle component of claim 16 , wherein the metal substrate comprises copper or copper alloy.

22. The vehicle component of claim 21 , wherein the metal substrate comprises aluminum or aluminum alloy.

Assignees

• Boeing Co

Inventors

• Schuette Waynie M
• Kinlen Patrick J

Classifications

• C23C20/08 Primary

  with compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides · CPC title

• C23C2222/20

  Use of solutions containing silanes · CPC title

• Y10T428/31663

  As siloxane, silicone or silane · CPC title

• C23C18/1254

  Sol or sol-gel processing · CPC title

• B60Y2200/50

  Aeroplanes, Helicopters · CPC title