Terahertz corrosion detection method

• US 8,623,653 B2
• Filed: 04/09/2009
• Issued: 01/07/2014
• Est. Priority Date: 04/09/2008
• Status: Active Grant

• Current Assignee: Battelle Memorial Institute
• Original Assignee: Battelle Memorial Institute
• Inventors: Lalgudi, Ramanathan S., McGraw, Barry L., Cain, Robert J.
• Primary Examiner(s): Soderquist, Arlen
• Application Number:
  US12/934,369
• Publication Number:
  US 20110053275A1
• Time in Patent Office: 1,734 Days
• Field of Search: 436 5- 6, 436/73, 436/164, 436/166, 436/172
• 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 method comprising:

providing a coating including a film forming material and a complexing agent, wherein the film forming material is a film forming polymer, the complexing agent being immobilized in the coating to reduce leaching;

applying the coating on a substrate that produces a corrosion byproduct which is a metal ion when it corrodes, the complexing agent and the corrosion byproduct forming a coordination 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, the radiation being terahertz rays.

2. The method of claim 1 wherein the complexing agent is immobilized by being part of the film forming polymer either in a main chain or a side chain.

3. The method of claim 2 wherein the film forming polymer includes molecules of the complexing agent attached as side chains to the main chain of the polymer.

4. The method 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.

5. The method of claim 4 wherein the water insoluble metal oxide is selected from the group consisting of titania, zirconia, silica, magnesia, alumina, and mixtures thereof.