APPLICATION OF SUPERCONDUCTING MAGNETOMETRY IN THE STUDY OF AIRCRAFT ALUMINUM-ALLOY CORROSION

The magnetic field distributions normal to surfaces undergoing three d ifferent types of in-situ active corrosion were measured noninvasively by magnetometry using a superconducting quantum interference device ( SQUID). Variations of the magnetic field strength with time differed f or the three types, and a higher corrosion rate resulted in a more int ense magnetic field. The SQUID magnetometer was shown to be sensitive to corrosion activity occurring on the opposite surface of a plate spe cimen (i.e., to hidden corrosion activity).