DETECTING IN-SITU ACTIVE CORROSION BY A SQUID MAGNETOMETER

The magnetic field distributions above the surface of in-situ active c orroding 2024-T3 and 7075-T6 aircraft aluminum alloy plates have been measured using a high-resolution superconducting quantum interference device (SQUID) magnetometer. The magnetic field distributions and thei r variation with time are clearly different for the two aluminum alloy s in an identical solution and for 2024-T3 in two different solutions. It is believed that these results demonstrate the ability of SQUID to noninvasively detect in-situ active corrosion in aircraft aluminum al loys in a way that present corrosion-detection methods do not allow.