Corrosion Hide and Seek.(Brief Article)
Industrial Heating, June, 2001 by KUBEL JR, ED
Corrosion occurs not only on parts and systems where it is easily detected and can be remedied, but also on hidden surfaces where it is extremely difficult to detect and study. The U.S. Air Force is especially concerned about hidden corrosion damage in aluminum aircraft structures, and funded a study at Vanderbilt University to determine if an automated scanning magnetometer could be used to image the magnetic fields associated with ongoing, hidden corrosion in metal samples removed from aging military airplanes.
Vanderbilt researchers John W. Wikswo and Grant Skennerton successfully used a supersensitive instrument, called SQUID (Superconducting QUantum Interference Device), to detect the subtle changes in magnetic field strength as a metal corrodes. SQUIDs...
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