Evaluation of Degradation Behavior of Protective Coatings by Scanning Acoustic Microscopy (Part 2): Comparison of Various Coatings

摘要

The deterioration behavior of pigmented epoxy (EP-P), clear epoxy (EP-C) and clear polyvingly chloride (PVC-C) coated steel in an aqueous 3/100 Nacl solution was investigated by scanning acoustic microscope (SAM). results of experiments showed that SAM can be used to identify and determine the extent of disbonding due to blisters on any kind of coatings applied on steel. For clear coating film, the characteristics and the nature of blisters on the coating film were substantially observed by the SAM than by visual inspection.