Abstract
The behaviour of six metal-paint systems exposed to accelerated corrosion tests, salt spray and Kesternich cabinet tests (humid air cycling with periodical addition of sulphur dioxide) has been investigated by the a.c. impedance technique. Regular inspections of rusting and blistering on painted surfaces were carried out. Adhesion evaluation was performed using pull-off tests after exposure to the various atmospheres. It was found that a.c. impedance measurements complement the results of the accelerated tests and provide comparative quantitative data and valuable information on the coating degradation mechanism. The impedance measurements associated with accelerated tests enable the early prediction of the paint deterioration in comparison with usual atmospheric exposure and help to anticipate the metallic corrosion at the metal/coating interface.
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