Compositions and coatings with non-chrome corrosion inhibitor particles
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.
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.