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Thermographic detection of corrosion delamination

: Meinlschmidt, P.; Pausch, G.B.

Journal of Coatings Technology : JCT (2001), Nr.3, S.106-111
ISSN: 0361-8773
Fraunhofer WKI ()

The initial stages of corrosion or delamination usually occur under the coating system , undetectable by visual inspection. However, these defects can be detected by transient thermography: The surface is subjected to a short heat pulse, and the subsequent temperature decay is recorded with a high lateral resolution. Thus, subsurface defects show as hot or cold spots. The method is also suitable to record the homogeneity of the coatings thickness.