Corrosion inhibition system

Patent metadata

Field	Value
Publication number	US-11603474-B2
Application number	US-201916660436-A
Country	US
Kind code	B2
Filing date	Oct 22, 2019
Priority date	Oct 22, 2019
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

A method of corrosion inhibition on a substrate may comprise: applying a sealing solution to an anodized surface of the substrate, wherein the sealing solution may comprise a nanomaterial dopant and a corrosion inhibiting compound, wherein the nanomaterial dopant may comprise at least one of graphene nanoplatelets, carbon nanotubes, and carbon nanofibers, and wherein the corrosion inhibiting compound may comprise at least one of a trivalent chromium compound, a trivalent praseodymium compound, nickel acetate, cobalt acetate, siloxanes, silicates, orthophosphates, molybdates, or a compound comprising at least one of elemental or ionic praseodymium, cerium, cesium, lanthanum, zinc, lithium, magnesium, or yttrium; and drying the sealing solution on the substrate to form a sealing layer comprising the nanomaterial dopant and the corrosion inhibiting compound.

First claim

What is claimed is:

1. A method of corrosion inhibition on a substrate, comprising:
applying a sealing solution to an anodized surface of the substrate, wherein the substrate comprises at least one of aluminum, an aluminum alloy, a titanium alloy, magnesium, or a magnesium alloy, wherein the anodized surface comprises a plurality of pores, wherein each pore of the plurality of pores comprises a pore cross-sectional area, wherein the sealing solution comprises a nanomaterial dopant and a corrosion inhibiting compound,
wherein the nanomaterial dopant comprises at least one of graphene nanoplatelets, carbon nanotubes, and carbon nanofibers, wherein the nanomaterial dopant comprises a cross-sectional area that is greater than the pore cross-sectional area such that the nanomaterial dopant remains outside the plurality of pores, and
wherein the corrosion inhibiting compound comprises at least one of a trivalent chromium compound, a trivalent praseodymium compound, nickel acetate, cobalt acetate, siloxanes, silicates, orthophosphates, molybdates, or a compound comprising at least one of elemental or ionic praseodymium, cerium, cesium, lanthanum, zinc, lithium, magnesium, or yttrium;
drying the sealing solution on the substrate to form a sealing layer comprising the nanomaterial dopant and the corrosion inhibiting compound; and
applying a primer to the substrate after the drying the sealing solution, wherein the primer comprises an epoxy.

2. The method of claim 1 , wherein the nanomaterial dopant comprises oxygen on a nanomaterial surface of the nanomaterial dopant, and wherein the nanomaterial dopant is functionalized with at least one of an organosilane, an oxysilane, an amine, an epoxide, a mercapto group, a phosphate ester, a titanate, an aliphatic species, an aromatic species, or a compound that may form via esterification.

3. The method of claim 2 , wherein the nanomaterial dopant is functionalized by adding the at least one of the organosilane or the oxysilane to the sealing solution comprising the nanomaterial dopant such that the at least one of the organosilane or the oxysilane bond with the nanomaterial dopant.

4. The method of claim 3 , further comprising strengthening adhesion of the sealing layer to at least one of the substrate or the primer via the functionalization of the nanomaterial dopant.

5. The method of claim 4 , wherein the adding the at least one of the organosilane or the oxysilane to the sealing solution comprises adding a first organosilane or oxysilane and a second organosilane or oxysilane, wherein the first organosilane or oxysilane functionalizes the nanomaterial dopant to strengthen adherence of the sealing layer to the substrate, and wherein the second organosilane or oxysilane functionalizes the nanomaterial dopant to strengthen adherence of the sealing layer to the primer.

6. The method of claim 1 , wherein the primer comprises a primer corrosion inhibiting compound comprising at least one of a trivalent chromium compound, a trivalent praseodymium compound, siloxanes, silicates, orthophosphates, molybdates, or a compound comprising at least one of elemental or ionic praseodymium, cerium, cesium, lanthanum, zinc, lithium, magnesium, or yttrium.

7. The method of claim 1 , wherein the corrosion inhibiting compound comprises at least one of chromium (III) oxide, praseodymium(III) oxide, cerium oxide, yttrium oxide, lanthanum oxide, magnesium silicate, aluminum phosphate, lithium carbonate, silicic acid, trizinc bis(orthophosphate), and molybdenum oxide.

8. The method of claim 1 , further comprising anodizing the substrate to create the anodized surface of the substrate by applying an acid solution to the substrate comprising at least one of sulfuric acid, chromic acid, boric acid-sulfuric acid, tartaric acid-sulfuric acid, phosphoric acid, oxalic acid before the applying the sealing solution.

9. The method of claim 1 , wherein the sealing solution comprises about 10% by weight nanomaterial dopant.

10. The method of claim 1 , wherein the sealing layer comprises between 0.025% to 3.5% by weight nanomaterial dopant.

11. A corrosion inhibition system disposed on a substrate, comprising:
a sealing layer disposed on an anodized surface of the substrate, wherein the substrate comprises at least one of aluminum, an aluminum alloy, a titanium alloy, magnesium, or a magnesium alloy, wherein the anodized surface comprises a plurality of pores, wherein each pore of the plurality of pores comprises a pore cross-sectional area, wherein the sealing layer comprises a nanomaterial dopant and a corrosion inhibiting compound, wherein the nanomaterial dopant comprises at least one of graphene nanoplatelets, carbon nanotubes, or carbon nanofibers, wherein the nanomaterial dopant comprises a cross-sectional area that is greater than the pore cross-sectional area such that the nanomaterial dopant remains outside the plurality of pores, and wherein the corrosion inhibiting compound comprises at least one of a trivalent chromium compound, a trivalent praseodymium compound, nickel acetate, cobalt acetate, siloxanes, silicates, orthophosphates, molybdates, or a compound comprising at least one of elemental or ionic praseodymium, cerium, cesium, lanthanum, zinc, lithium, magnesium, or yttrium; and
a primer layer disposed on the sealing layer, wherein the primer layer comprises an epoxy.

12. The corrosion inhibition system of claim 11 , wherein the nanomaterial dopant comprises oxygen on a nanomaterial surface, wherein the nanomaterial dopant is functionalized with at least one of an organosilane or an oxysilane.

13. The corrosion inhibition system of claim 12 , wherein the sealing layer is adhered to at least one of the substrate or the primer at least partially via the nanomaterial dopant being functionalized.

14. The corrosion inhibition system of claim 13 , wherein the sealing layer comprises between 0.025% to 3.5% by weight nanomaterial dopant.

15. The corrosion inhibition system of claim 13 , wherein the sealing layer comprises at least one of nickel acetate or cobalt acetate.

Assignees

• Goodrich Corp

Inventors

• Poteet Steven A
• Smith Blair A
• Pujar Vijay V
• Steele Leslie

Classifications

• C25D11/26

  of refractory metals or alloys based thereon · CPC title

• C09D167/08

  Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids · CPC title

• C09D5/084

  Inorganic compounds · CPC title

• C25D11/04

  of aluminium or alloys based thereon · CPC title

• C09D7/70

  characterised by shape, e.g. fibres, flakes or microspheres · CPC title