확산한계전류밀도 고찰에 의한 방청도료의 내식성평가

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 23; no. 4; pp. 64 - 68
• Main Authors: 문경만(Kyung-Man Moon), 김윤해(Yun-Hae Kim), 이명훈(Myung-Hoon Lee), 이인원(In-Won Lee), 박현(Hyun Park), 전호환(Ho-Hwan Chun)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2009
• Subjects: 해양공학; Corrosion resistance 내식성, Anti-corrosive paint 방청도료, Electrochemical methods 전기화학적방법, Resin series 수지계열, Diffusion limiting current density 학산한계전류밀도
• ISSN: 1225-0767; 2287-6715

It has been observed that coated steel structures deteriorate more rapidly than the designed lifetime due to acid rain caused by air pollution, etc. Therefore, improving the corrosion resistance of anti-corrosive paint is very important in terms of safety and the economic point of view. In this study, the corrosion resistance of five kinds of anti-corrosive paints, including the Acryl, Fluorine, and Epoxy resin series, were investigated with electrochemical methods, such as corrosion potential measurements, polarization curves, diffusion limiting current density, etc. As a result, the corrosion resistance of the F101 specimen with the fluorine resin series was found to be superior to the other specimens, while E100 with the epoxy resin series also showed a somewhat good corrosion resistance. Furthermore, it was observed that the amount of water and oxygen entering the inner side of a painted film increased with an increase in immersion time, irrespective of the kind of resin series. However, the oxygen diffusion limiting current density of a specimen with good corrosion resistance was relatively decreased compared to other specimens, because of the difficulty of oxygen diffusion penetrating to the inner side of the film. Consequently it is suggested that we can qualitatively evaluate the corrosion resistance of an anti-corrosive paint by measuring the diffusion limiting current density as an electrochemical method.