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Nondestructive detection of steel surface corrosion

  • US 6,411,105 B1
  • Filed: 09/11/2000
  • Issued: 06/25/2002
  • Est. Priority Date: 09/11/2000
  • Status: Expired due to Fees
First Claim
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1. A method for detection of corrosion on a surface of steel beneath a non-magnetic protective coating thereon, comprising the steps of:

  • supplying microwave energy of appropriate frequency to the steel through said coating;

    externally applying a static DC magnetic field to said surface of the steel causing an amount of the transmitted microwave energy to be absorbed in the steel dependent on deposit of oxides on said surface as products of the corrosion;

    coordinating measurements of the amount of the microwave energy absorbed with measurements of strength of the applied magnetic field before and after said deposit of the oxides on the surface of the steel; and

    effecting said detection of corrosion from said coordinating of the measurements which reflect absence and presence of the said products of corrosion on the surface of the steel.

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