Corrosion Detection Product and Method

• US 20110053275A1
• Filed: 04/09/2009
• Published: 03/03/2011
• Est. Priority Date: 04/09/2008
• Status: Active Grant

• Current Assignee: Battelle Memorial Institute
• Original Assignee: Battelle Memorial Institute
• Inventors: McGraw, Barry L., Cain, Robert J., Lalgudi, Ramanathan S.
• Granted Patent: US 8,623,653 B2
• Time in Patent Office: Days
• US Class Current: 436/6
• CPC Class Codes: C08K 5/3437 condensed with carbocyclic rings
• CPC Class Codes: C09D 5/086 Organic or non-macromolecular compounds
• CPC Class Codes: C09D 7/63 organic
• CPC Class Codes: G01N 17/006 of metals
• CPC Class Codes: G01N 21/77 by observing the effect on a chemical indicator

Abstract

A corrosion detection product is a coating including a film forming material and a complexing agent, the complexing agent forming a complex when it comes into contact with a corrosion byproduct produced by corrosion of a substrate on which the coating is applied, the complex being detectably different from the complexing agent when the coating is exposed to radiation in order to detect the corrosion, the complexing agent being immobilized in the coating to reduce leaching of the complexing agent or the complex from the coating.

Claims

1. A corrosion detection product comprising:

a coating including a film forming material and a complexing agent, the complexing agent forming a complex when it comes into contact with a corrosion byproduct produced by corrosion of a substrate on which the coating is applied, the complex being detectably different from the complexing agent when the coating is exposed to radiation in order to detect the corrosion, the complexing agent being immobilized in the coating to reduce leaching of the complexing agent or the complex from the coating.

2. The product of claim 1 wherein the radiation is ultraviolet radiation, infrared radiation or terahertz rays.

3. The product of claim 1 wherein the corrosion byproduct is a metal ion which forms a coordination complex with the complexing agent.

4. The product of claim 1 wherein the film forming material is a film forming polymer.

5. The product of claim 4 wherein the complexing agent is immobilized by being part of the film forming polymer either in a main chain or a side chain.

6. The product of claim 1 wherein the coating further includes a water insoluble metal oxide, and wherein the complexing agent is immobilized by being tethered to the metal oxide.

7. The product of claim 6 wherein the water insoluble metal oxide is selected from the group consisting of titania, zirconia, silica, magnesia, alumina, and mixtures thereof.

8. The product of claim 1 wherein the complexing agent and the complex are significantly different from each other in at least one property selected from the group consisting of density, refractive index, dipole moment, polarizability, conductivity, permeability, vapor pressure, melting point, heat capacity, and water of hydration.

9. The product of claim 1 wherein the difference between the energy band gap of the complex and the energy band gap of the complexing agent is at least about 1 eV.

10. A corrosion detection method comprising:

providing a coating including a film forming material and a complexing agent, the complexing agent being immobilized in the coating to reducing leaching;

applying the coating on a substrate that produces a corrosion byproduct when it corrodes, the complexing agent and the corrosion byproduct forming a complex when they come into contact with each other; and

exposing the coating to radiation which causes the complex to be detectably different from the complexing agent in order to detect the corrosion.

11. The method of claim 10 wherein the radiation is ultraviolet radiation, infrared radiation or terahertz rays.

12. The method of claim 10 wherein the corrosion byproduct is a metal ion which forms a coordination complex with the complexing agent.

13. The method of claim 10 wherein the film forming material is a film forming polymer.

14. The method of claim 13 wherein the complexing agent is immobilized by being part of the film forming polymer either in a main chain or a side chain.