Titanium-based coatings and methods for making coatings

Patent metadata

Field	Value
Publication number	US-12152306-B2
Application number	US-201916239312-A
Country	US
Kind code	B2
Filing date	Jan 3, 2019
Priority date	Jan 3, 2019
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

Aspects of the present disclosure provide titanium-based coatings and methods for making titanium-based coatings on surfaces. In at least one aspect, a coating includes an oxygen content, a fluorine content, a titanium content, and a sodium content. In one or more additional aspects, a coating includes titanium dioxide and Na 5 Ti 3 F 14 . In one or more additional aspects, a method of making a titanium-based coating includes contacting a substrate with a composition that includes from about 0.01 M to about 0.8 M of a titanium fluoride, from about 0.01 M to about 2 M of a sodium salt, and from about 0.1 M to about 1.5 M of a fluorine scavenger.

First claim

What is claimed is:

1. A method of making a titanium-based coating, the method comprising:
contacting a substrate with an aqueous solution, wherein:
the substrate is selected from the group consisting of aluminum, aluminum alloy, nickel, iron, iron alloy, steel, titanium, titanium alloy, copper, copper alloy, or a mixture thereof;
the substrate is heated at a temperature of about 40° C. to about 80° C., and
the aqueous solution comprises:
about 0.15 M to about 0.8 M of a titanium fluoride or a titanium fluorine complex,
about 0.3 M to about 2 M of a halogenated sodium salt, and
about 0.1 M to about 1.5 M of a fluorine scavenger, wherein the molar concentration of the halogenated sodium salt is greater than the molar concentration of the fluorine scavenger.

2. The method of claim 1 , wherein the aqueous solution comprises:
about 0.15 M to about 0.25 M of the titanium fluoride or a titanium fluoride complex;
about 0.9 M to about 1.4 M of the halogenated sodium salt; and
about 0.3 M to about 1 M of the fluorine scavenger.

3. The method of claim 2 , wherein the halogenated sodium salt is sodium chloride.

4. The method of claim 3 , wherein the titanium fluoride is (NH 4 ) 2 TiF 6 .

5. The method of claim 4 , wherein the fluorine scavenger is boric acid.

6. The method of claim 1 , wherein the substrate comprises aluminum.

7. The method of claim 6 , wherein the substrate is a component of an aircraft.

8. The method of claim 1 , wherein contacting comprises immersing the substrate in the aqueous solution.

9. The method of claim 1 , wherein the titanium-based coating comprises titanium dioxide and Na 5 Ti 3 F 14 .

10. The method of claim 9 , wherein the titanium-based coating has a titanium dioxide content of about 30 wt % to about 70 wt %, based on the total weight of the coating.

11. The method of claim 9 , wherein the titanium-based coating has a Na 5 Ti 3 F 14 content of about 30 wt % to about 70 wt %, based on the total weight of the coating.

12. The method of claim 11 , wherein the titanium-based coating has a Na 5 Ti 3 F 14 content of about 40 wt % to about 55 wt %, based on the total weight of the coating.

13. The method of claim 9 , wherein the titanium-based coating comprises an amorphous metal oxide phase and a crystalline sodium-containing phase.

14. The method of claim 13 , wherein the amorphous metal oxide phase is titanium dioxide.

15. The method of claim 13 , wherein the crystalline sodium-containing phase is Na 5 Ti 3 F 14 .

16. The method of claim 9 , wherein the titanium-based coating comprises about 40 wt % to about 50 wt % amorphous titanium dioxide and about 50 wt % to about 60 wt % crystalline Na 5 Ti 3 F 14 , based on the total weight of the coating.

17. The method of claim 9 , wherein the titanium-based coating has a thickness of about 20 mil to about 40 mil.

18. The method of claim 1 , wherein the fluorine scavenger is boric acid having a concentration of about 0.3 M to about 1 M.

19. The method of claim 1 , wherein the titanium-based coating comprises a fluorine content of about 1 atomic percent (at. %) to about 80 at. %, an oxygen content of about 1 at. % to about 80 at. %, a titanium content of about 1 at. % about 60 at. %, and a sodium content of about 1 at. % to about 60 at. %.

20. The method of claim 1 , wherein the aqueous solution comprises the halogenated sodium salt in an amount of about 1M to about 1.3M.

Assignees

• Boeing Co

Inventors

• Vajo John J
• Adjorlolo Alain A
• Graetz Jason A

Classifications

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C23C22/34 Primary

  containing fluorides or complex fluorides · CPC title

• C23C22/05 Primary

  using aqueous solutions · CPC title

• C09D5/08 Primary

  Anti-corrosive paints · CPC title