Soluble corrosion resistant sol-gel

Patent metadata

Field	Value
Publication number	US-11746245-B2
Application number	US-201916252387-A
Country	US
Kind code	B2
Filing date	Jan 18, 2019
Priority date	Feb 2, 2018
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

Aspects described herein generally relate to a sol-gel that is the reaction product of an organosilane, a metal alkoxide, an acid, and a thio-lanthanide salt having a solubility of about 1 gram or greater per gram of sol-gel at 23° C. The thio-lanthanide salt includes a cation and a thio-ligand. The cation can be lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium, cobalt, calcium, strontium, barium, and zirconium. In another aspect, a component, such as a vehicle component, includes a metal substrate and a sol-gel disposed on the metal substrate. Methods can include forming a sol-gel by mixing a metal alkoxide and an acid to form a first mixture; mixing with the first mixture an organosilane to form a second mixture; and mixing with the second mixture a lanthanide salt to form a third mixture.

First claim

What is claimed is:

1. A sol-gel comprising:
about 50 wt % or greater of water;
about 3 wt % to about 10 wt % of a compound that is a thio-lanthanide (III) salt, wherein the thio-lanthanide (III) salt comprises a triazole thiol ligand and a cation selected from cerium, praseodymium, or yttrium; and
a binder comprising:
an organosilane represented by Formula (II):

wherein R is selected from the group consisting of alkyl, cycloalkyl, aryl, arylether, poly(ethylene glycol), and poly(propylene glycol);

a zirconium (IV) tetraalkoxide; and
acetic acid;
wherein:
a molar ratio of the acetic acid to the zirconium (IV) tetraalkoxide is from about 1:1 to about 40:1,
a weight fraction of the binder in the sol-gel is about 0.3 wt % to about 50 wt %;
a weight ratio of the thio-lanthanide (III) salt to the binder is from about 0.01:1 to about 5:1; and

the thio-lanthanide (III) salt has a solubility in the sol-gel such that at least 1 g of thio-lanthanide (III) salt is soluble in 1 g of sol-gel.

2. The sol-gel of claim 1 , wherein a weight ratio of the thio-lanthanide (III) salt to the binder is about 0.01:1 to about 0.5:1 by weight.

3. The sol-gel of claim 1 , wherein a weight ratio of the thio-lanthanide (III) salt to the binder is about 1:1 to about 5:1.

4. The sol-gel of claim 1 , wherein the zirconium (IV) tetraalkoxide is selected from the 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.

5. The sol-gel of claim 1 , wherein the thio-lanthanide (III) salt is a cerium (III) salt.

6. The sol-gel of claim 1 , wherein the thio-lanthanide (III) salt is a praseodymium (III) salt.

7. The sol-gel of claim 1 , wherein the sol-gel comprises about 95 wt % or greater of water.

8. The sol-gel of claim 1 , wherein the R group is selected from the group consisting of a linear or branched C 1-20 alkyl chain.

9. The sol-gel of claim 1 , wherein the R group is selected from the group consisting of poly(ethylene glycol) or poly(propylene glycol) and has a number average molecular weight of about 300 g/mol to about 500 g/mol.

10. The organosilane of claim 9 , wherein the R group is selected from the group consisting of poly(ethylene glycol) or poly(propylene glycol) and has a number average molecular weight of about 400 g/mol to about 425 g/mol.

11. The sol-gel of claim 1 , wherein the molar ratio of the acetic acid to the zirconium (IV) tetraoxide is about 4:1 to about 5:1.

12. The sol-gel of claim 1 , wherein the weight fraction of the binder in the sol-gel comprises about 8 wt % to about 22 wt %.

13. The sol-gel of claim 1 , wherein the thio-lanthanide (III) salt is a metal-organic framework (MOF).

14. The sol-gel of claim 1 , wherein:
the molar ratio of the acetic acid to the zirconium (IV) tetraoxide is about 4:1 to about 5:1,
the weight fraction of the binder in the sol-gel comprises about 8 wt % to about 22 wt %, and
wherein the thio-lanthanide (III) salt is a metal-organic framework (MOF).

15. A component comprising:
a metal substrate; and
the sol-gel of claim 1 disposed on the metal substrate.

16. The component of claim 15 , further comprising a secondary layer disposed on the sol-gel.

17. The component of claim 16 , wherein the secondary layer is an epoxy coating or urethane coating.

18. The component of claim 15 , wherein the component is a vehicle component selected from 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 component of claim 15 , wherein the metal substrate is selected from aluminum, aluminum alloy, nickel, iron, iron alloy, steel, titanium, titanium alloy, copper, copper alloy, and mixtures thereof.

Assignees

• Boeing Co
• Commw Scient Ind Res Org

Inventors

• Schuette Waynie M
• Kinlen Patrick J
• White Paul Andrew

Classifications

• C09D5/086 Primary

  Organic or non-macromolecular compounds · CPC title

• C08G77/16

  to hydroxy groups · CPC title

• C08G77/18

  to alkoxy or aryloxy groups · CPC title

• C08G77/58 Primary

  Metal-containing linkages · CPC title

• C08K5/057

  Metal alcoholates {(metal enolates C08K5/0091)} · CPC title