Comparative Evaluation of Protective Coatings during Accelerated Deterioration

Abstract

Accelerated deterioration tests were carried out to evaluate the anticorrosive properties of alkyd, chlorinated rubber, urethane, and epoxy resin varnish coatings. During the deterioration test, the specimens were exposed to weathering conditions, that is, xenon light irradiation in a Weather-O-Meter. Three different methods were used to evaluate the anticorrosive performance of coatings and the results obtained were compared with each other. The gloss retention, change of chemical structure and impedance of coated specimens were monitored using gloss meter, FT/IR-ATR, and electrochemical impedance spectroscopy, respectively. It was shown that the evaluations of the coatings by three different methods reveal similar results. It was demonstrated that the anticorrosive properties of coatings changed dramatically according to resin.
The anticorrosive performances of coatings were found to decrease in the order of urethane>alkyd>epoxy>chlorinated rubber resin coating.