USING THE COMPUTER TO ANALYZE COATING DEFECTS

The application is demonstrated of computer image processing as a non-destructive technique for quantifying the condition of painted surfaces in both the laboratory and the field. Existing visual standards have been evaluated, with discrepancies among the rusting standards being noted. Laboratory specimens have been successfully imaged using a thermographic camera for interfacial corrosion and blistering of coated metal systems, and using a video camera for defects in coated wood systems. Painted structures have been evaluated. The information provided by computer image processing should assist field engineers in scheduling maintenance and choosing a repair strategy. Concerns that need to be addressed are also discussed.