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Evaluation of cathodic disbondment of epoxy coating containing azole compounds
M. Mahdavian,R. Naderi,M. Peighambari,M. Hamdipour,S.A. Haddadi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Cathodic disbonding of the epoxy coatings on the mild steel was evaluated in 3.5% NaCl solution, wherebenzimidazole, benzothiazole and benzotriazole were used as additives in the coatings. Also, theelectrochemical behavior of coatings delaminating in NaCl solution from a small artificial defect and thebare mild steel samples in the 3.5% NaCl solution containing the azole compounds was evaluated byelectrochemical impedance spectroscopy at cathodic polarization condition. Results showed that theazole compounds were not immobilized in the coating as they could leach out and act as cathodicinhibitor at defect site and disbonding front.