Method and apparatus for detecting corrosion under non-ferromagn

Details Method and apparatus for detecting corrosion under non-ferromagn Method and apparatus for detecting corrosion under non-ferromagn

1996-08-19

1999-05-18

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

G01V3/00

Patent

active

059053763

ABSTRACT:
A method using nuclear magnetic resonance techniques to detect corrosion within metallic structures such as aluminum under non-ferromagnetic coatings without first having to remove the coatings. The metallic structure is placed within an external static magnetic field. A series of radio frequency preparation and inspection pulses is applied to the metallic with the preparation pulses, and for generating a series of nuclear magnetic resonance response signals with the inspection pulses. The response signals are detected and the amplitudes of the response signals are compared with the spin--spin relaxation time of corrosion for detecting the presence of corrosion in the structure.

REFERENCES:
patent: 5672968 (1997-09-01), Miller et al.
Palmer, Novel NDE For Corrosion Detection: Nuclear Magnetic Resonance, Jan., 1996.
Snyderman, NDE Applications of NMR to Aluminum Corrosion and Composite Materials, May, 1996.
Palmer, Snyderman, and Conradi, Characterization of Corrosion in Aluminum Alloys Using Nuclear Magnetic Resonance, 1996.
Fry and Palmer, NDE of Aerospace Materials Using Nuclear Magnetic Resonance, 1994.
Palmer and Leopold, Evaluation of Aluminum Corrosion and Composite Heat Damage Using Magnetic Resonance NDE, 1995.

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