Use of a disulfide/dithiol compound in a seal for anodized aluminum

Patent metadata

Field	Value
Publication number	US-9970122-B2
Application number	US-201514851888-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Feb 27, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

Provided is a method for sealing an article with a non-chrome corrosion inhibitor seal. The method may include applying an aqueous-based suspension comprising a thiol-containing corrosion inhibitor on a surface of an anodized substrate.

First claim

What is claimed is:

1. A method for sealing an article with a non-chrome corrosion inhibitor seal, comprising:
applying an aqueous-based suspension on a surface of an anodized substrate,
wherein the aqueous-based suspension consists of 0.2 wt % to 3 wt % of 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) in water,
wherein the surface of the anodized substrate comprises an anodic oxide coating, wherein the anodic oxide coating comprises a plurality of cells, each of the plurality of cells defining at least one pore,
wherein a temperature of the aqueous-based suspension, when it is applied on the anodized substrate, is in the range of from about 68° F. to about 79° F., and
wherein the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) comprises nano-sized particles; and

transporting at least one of the particles into the at least one pore.

2. The method of claim 1 , wherein at least one of the particles has a particle diameter that is smaller than a pore diameter of the at least one pore.

3. The method of claim 1 , wherein each of the plurality of cells comprise a cell diameter in a range of from about 50 nm to about 300 nm.

4. The method of claim 1 , wherein each of the plurality of cells comprises a cell diameter, and wherein the at least one pore comprise a pore diameter that is about ⅓ to about ½ of the cell diameter.

5. The method of claim 1 , further comprising:
transporting a plurality of the particles into each of a plurality of pores.

6. The method of claim 1 , wherein at least one of the particles is transported into the at least one of the pore by capillary pressure.

7. The method of claim 1 , wherein the applying comprises at least one of immersing the substrate into a volume of the suspension or brushing the suspension onto the surface.

8. The method of claim 1 , wherein the anodized substrate comprises anodized aluminum or an anodized aluminum alloy.

9. The method of claim 1 , wherein the suspension consists of 1 wt % to 3 wt % of 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) in water.

10. The method of claim 1 , further comprising forming a mixture consisting of the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) and the water, and agitating the mixture to form the aqueous suspension.

11. The method of claim 10 , wherein the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) comprises crude 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione), and the agitating of the mixture reduces a size of the crude 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) to form the nano-sized particles.

12. The method of claim 1 , further comprising removing excess volume of the aqueous-based suspension from the anodized substrate.

13. The method of claim 1 , wherein the transporting of the at least one of the particles comprises a plurality of the particles.

14. The method of claim 1 , wherein the plurality of the particles fills the at least one pore.

15. A method for sealing an article with a non-chrome corrosion inhibitor seal, comprising:
applying an aqueous-based suspension on a surface of an anodized substrate,
wherein the aqueous-based suspension consists of 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) in water,
wherein a temperature of the aqueous-based suspension, when it is applied on the anodized substrate, is in the range of from about 68° F. to about 79° F.,
wherein the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) comprises nano-sized particles.

16. A method for sealing an article with a non-chrome corrosion inhibitor seal, comprising:
applying an aqueous-based suspension on a surface of an anodized substrate,
wherein the aqueous-based suspension consists of 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) in water.

17. The method of claim 16 , wherein the surface of the anodized substrate comprises an anodic oxide coating, wherein the anodic oxide coating comprises a plurality of cells, each of the plurality of cells defining at least one pore.

18. The method of claim 16 , wherein the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) comprises nano-sized particles.

19. The method of claim 18 , further comprising transporting a plurality of the particles into each of a plurality of pores.

20. The method of claim 16 , further comprising removing excess volume of the aqueous-based suspension from the anodized substrate.

21. The method of claim 16 , further comprising forming a mixture consisting of the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) and the water, and agitating the mixture to form the aqueous suspension.

Assignees

• Boeing Co

Inventors

• Lawless Lawrence M
• Griffin Bruce M

Classifications

• C09K15/30

  containing heterocyclic ring with at least one nitrogen atom as ring member · CPC title

• C25D11/246 Primary

  for sealing layers · CPC title

• C25D11/18

  After-treatment, e.g. pore-sealing · CPC title

• C23F11/161

  Mercaptans · CPC title