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Evaluation of Anticorrosive Performance of Organic Coatings Subjected to Cyclic Wet-dry Exposure  

박진환 (부경대학교 응용화학공학부)
이근대 (부경대학교 응용화학공학부)
전호환 (부산대학교 첨단조선공학연구센타)
Publication Information
Journal of Ocean Engineering and Technology / v.18, no.1, 2004 , pp. 75-79 More about this Journal
Abstract
Organic coatings are widely used to control of the corrosion of a steel structure. The water in coatings may cause the coatings to swell, leading to the degradation of the coatings. In addition, water affects the permeation of oxygen and other corrosive agents, and consequently, the presence of such substances at coating-metal interface promotes corrosion of the metal substrate. In this study, the anticorrosive properties of 4 types of coating, such as epoxy-epoxy, epoxy-urethane, urethane-epoxy, urethane-urethane, were evaluated. The evaluation tests were conducted under cyclic water-absorption/desorption conditions, consisting of alternative exposure to diluted 0.001M-LiCl(a$H_2O$≒1) and concentrated 10M-LiCl(a$H_2O$≒0.15). The anticorrosive performance of coatings was found to decrease in the order of urethane-urethane > urethane-epoxy > epoxy-epoxy coating.
Keywords
Organic Coatings; Water-Absorption/Desorption; Anticorrosive Property; Degradation; AC Impedance Spectroscopy;
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