Techniques for hidden corrosion detection is one of the serious
problem affecting airforce and other aviation industries. It
affects the aircraft on its wings, surface, between joints and
fasteners. The presences of corrosion underneath the paints of
surface and between joints are not easy to be detected. The
unnoticed presence of corrosion may cause the aircraft to crash
leading to human and money loses. To detect the corrosion
present on the metal surface, various methods and tests are
used. These tests conducted should be such that it does not
destroy or disassemble the plane to parts or damage its surface.
Hence for the further use of the plane, Non-destructive tests
(NDT) are testing as the name suggests is testing procedure
without any damage to the part being tested. The various non-
destructive testing methods used are:Ultrasonic inspection is
conventionally used for corrosion detection in aircraft wings.
But the conventional inspection method carries with it certain
defects like: 2) X-ray inspection 3