3 December 1993 Evaluation of high-sensitivity magnetic imaging for hidden corrosion
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Abstract
The magnetic signature associated with electrochemical corrosion in standard aircraft lap joints has been investigated with a superconducting quantum interference device (SQUID) magnetometer. Preliminary results on both spatial and temporal scans of single aluminum electrodes and lap joint samples exposed to dilute NaOH are presented for the first time. We have observed definite corrosion signals from a wide variety of aluminum samples, in all physical orientations relative to the instrument, down to an electrolyte concentration of 0.01 M. We have also detected natural filiform corrosion taking place in a dry 40 year old joint not exposed to additional corrosives. These preliminary results indicate that SQUID based magnetometers can be applied to detect corrosion in aging aircraft.
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Andrew D. Hibbs, Russell Chung, J. Scott Pence, Quinn C. Talley, Thomas A. Sage, "Evaluation of high-sensitivity magnetic imaging for hidden corrosion", Proc. SPIE 2001, Nondestructive Inspection of Aging Aircraft, (3 December 1993); doi: 10.1117/12.163844; https://doi.org/10.1117/12.163844
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