본 연구에서는 국내에서 사용되고 있는 우레탄계, 세라믹계, 폴리실록산계 및 불소수지계 강교량용 도장계를 대상으로 실내 부식실험을 실시하여 도장계별 노화모델을 도출하였다. 상도를 구분하여 각 도장계별로 시험편을 제작하였으며, 직경 0.5, 1, 3, 5 mm의 원형 결함을 도입하였다. ISO 20340를 이용하여 극한환경을 모사한 부식촉진실험을 실시하였다. 도장계별 노화곡선은 원형결함의 노화면적을 기준으로 평가되었다. 노화곡선을 사용하여 공용중인 강교의 도장 사용수명을 평가하기 위하여 촉진배율을 산출하였으며, 촉진배율은 ISO 20340과 ISO 9223의 대기환경 부식속도를 기준으로 산출되었다. 실험결과, 노화진전속도는 원형결함의 크기와 상관없이 증가하였으며, 노화면적이 3%일 때 우레탄 도장계의 노화수명은 C2, C3, C4 및 C5 등급에서 약 31.8, 15.8, 9.9 및 3.9년으로 평가되었다.

This study investigates the coating deterioration of water-borne inorganic zine under marine environment. In order to evaluate the corrosion environment at installed site, the corrosion currents were measured by atmospheric corrosion monitoring(ACM) sensor. The deterioration grade of water-borne inorganic zine was investigated by visual inspection method depending on ASTM D610. The deterioration grade of structural member was compared based on corrosion environment such as wet time, amount of deposited salt etc.

Visual inspection has generally been applied to examine the coating deterioration. However, it was difficult to evaluate an anti-corrosion performance of paint film. In this study, thus, to quantitatively evaluate an anti-corrosion performance of paint film under various corrosion enviornent, change in the impedance paint coating was evauated using EIS (Electrochemical Impedance Spectroscopy).

Visual inspection has generally been applied to examine the coating deterioration. However, it was difficult to evaluate an anti-corrosion performance of paint film. In this study, thus, to quantitatively evaluate an anti-corrosion performance of paint film under various corrosion enviornent, change in the impedance paint coating was evauated using EIS (Electrochemical Impedance Spectroscopy).