Abstract
Adequate adhesion is thesine qua non for good practical performance in surface coatings systems such as paint. By far the majority of tests used in the coatings industry are destructive and difficult to correlate with performance. Moreover, destructive tests are incompatible with best practice in inspection and quality control. A range of non-destructive testing techniques was appraised for their ability to investigate different types of coating failure involving adhesion. Three techniques were selected for preliminary investigation, namely acoustic emission, pulse thermography and laser interferometry. All three techniques were capable of investigating different aspects of adhesive failure. Pulse thermography could detect subsurface damage not apparent to visual inspection, and acoustic emission could, under some circumstances, give information of damage initiation prior to catastrophic failure. Electronic speckle pattern shearing interferometry (ESPSI) was also able to detect sub-surface damage, and showed promise of detecting differences in strain transfer prior to any detachment failure.
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