Compositions and coatings with non-chrome corrosion inhibitor particles

Patent metadata

Field	Value
Publication number	US-10508203-B2
Application number	US-201514852065-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Sep 26, 2014
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

Compositions are described for protecting a metal surface against corrosion. The composition includes a corrosion-inhibiting particle. The corrosion inhibiting particle may be usable in an epoxy resin-based coating or an olefin resin-based coating. The particle may include a core and a protectant. The core may include a water soluble corrosion inhibitor. The protectant may be disposed on at least a portion of a surface of the core and may be covalently or ionically bonded to a thiol group of the corrosion inhibitor. The protectant may be configured to reduce reaction between the core and the epoxy resin or the olefin resin.

First claim

What is claimed is:

1. A chemically reactive, non-chrome corrosion-inhibiting particle comprising:
a micronized core comprised of a thiol-containing corrosion inhibitor, and
a protectant disposed on a surface of the core and covalently bonded to a thiol group of the corrosion inhibitor, the protectant being configured as a shell surrounding the core, the protectant being formed from a material chosen from epoxy and poly(meth)acrylates, the micronized core and protectant together forming the non-chrome corrosion-inhibiting particle;
wherein the micronized core comprises a particle size in a range of about 100 nm to about 5 μm.

2. The particle of claim 1 , wherein the core comprises a chemically neutralized surface.

3. The particle of claim 1 , wherein the corrosion inhibitor is water soluble.

4. The particle of claim 1 , wherein the corrosion inhibitor comprises a polydisulfide.

5. The particle of claim 1 , wherein the corrosion inhibitor comprises a mercaptan-terminated polysulfide of dimercaptothiadiazole.

6. The particle of claim 1 , wherein the corrosion inhibitor comprises a mercaptan-terminated corrosion-inhibitor.

7. The particle of claim 1 , wherein the protectant is water-permeable, and wherein dissolved corrosion-inhibitor can diffuse through the protectant.

8. A corrosion-inhibiting composition, comprising the corrosion-inhibiting particle of claim 1 and a carrier, wherein the carrier comprises at least one selected from the group consisting of an epoxy resin and an olefin resin, and the protectant reduces cross-linking between the core and the epoxy resin or the olefin resin.

9. A method for preparing a chemically reactive, non-chrome corrosion-inhibiting particle, the method comprising:
providing a thiol-containing, chemically reactive corrosion-inhibitor;
micronizing the corrosion inhibitor to form a core, the core having a particle size in a range of about 100 nm to about 5 μm; and
forming a protectant on a surface of the core by covalently bonding at least one of a reactive component of a protectant-forming composition to a thiol group of the corrosion-inhibitor, the protectant being configured as a shell surrounding the core, the protectant being formed from a material chosen from epoxy and poly(meth)acrylates, the micronized core and protectant together forming the non-chrome corrosion-inhibiting particle.

10. The method of claim 9 , wherein the corrosion-inhibitor comprises a mercaptan-terminated polysulfide.

11. The method of claim 9 , further comprising exposing the micronized corrosion inhibitor to a base.

12. The method of claim 11 , wherein the base is selected from NaOH or KOH.

13. The method of claim 9 , wherein the protectant-forming composition comprises the epoxy.

14. An article, comprising:
a metal substrate; and
a corrosion-inhibiting coating disposed on the substrate and comprising a chemically reactive, non-chrome corrosion-inhibitor particle incorporated in an epoxy or an olefin,
wherein the corrosion-inhibitor particle comprises:
a micronized core comprising a chemically reactive thiol-containing corrosion inhibitor; and
a protectant disposed on a surface of the core and covalently bonded to a thiol group of the corrosion inhibitor, the protectant being configured as a shell surrounding the core, the protectant being formed from a material chosen from epoxy and poly(meth)acrylates, the micronized core and protectant together forming the non-chrome corrosion-inhibiting particle, the protectant configured to reduce reaction between the core and the epoxy or the olefin,
wherein the micronized core comprises a particle size in a range of about 100 nm to about 5 μm.

15. The article of claim 14 , wherein the corrosion-inhibitor is water soluble.

16. The article of claim 14 , wherein the corrosion-inhibitor comprises a polydisulfide.

17. The article of claim 14 , wherein the corrosion-inhibitor comprises a mercaptan-terminated polysulfide of dimercaptothiadiazole.

18. The article of claim 14 , wherein the protectant is water-permeable, and wherein dissolved corrosion-inhibitor can diffuse through the protectant.

19. The article of claim 14 , wherein the metal substrate comprises aluminum, aluminum alloy, steel, magnesium, magnesium alloy, copper, copper alloy, tin, tin alloy, nickel alloy, titanium, titanium alloys, or combinations thereof.

Assignees

• Boeing Co

Inventors

• Kinlen Patrick J
• Schultz Karen A
• Krienke Kenneth A
• Lawless Lawrence M
• Schuette Waynie M

Classifications

• C23F11/165

  Heterocyclic compounds containing sulfur as hetero atom · CPC title

• C09D5/086

  Organic or non-macromolecular compounds · CPC title

• C09D5/028

  Pigments; Filters · CPC title

• C09D5/082

  characterised by the anti-corrosive pigment · CPC title

• C09D163/00

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title