알루미늄합금 원통냉각기의 부식 특성에 관한 연구
The Study on the Corrosion Characteristics of Al-Alloy Shell Cooler
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초록
청수 환경 중에서 박용 고속디젤기관의 냉각용 청수냉각기의 원통재료인 알루미늄 합금재 그리고 세관재료인 동 및 네이발 황동에 대한 분극저항, 부식 전류밀도, 양극분극거동 및 전지작용부식 경향에 관하여 연구한 결과 다음과 같은 결론을 얻었다. 1) 부식전류 밀도는 알루미늄 합금재 > 네이발 황동 > 동의 순으로 높게 나타난다. 2) 양극전위가 상승할수록 네이발 황동의 내식성이 동의 내식성보다 더 우수할 것으로 판단된다. 3) 동 및 네이발 황동과 조합된 알루미늄합금의 전지 작용부식은 알루미늄합금 단독의 부식보다 더 활성화 된다.
Abstract
Most Recently, with rapid development in marine industries such as marine structures and ship, there occurs much interest in the study of corrosion characteristics which play an important role in design of cooling water system like heat-exchanger. Especially, as operating environment of fresh cooling water system in vessels is acidified, this system is seriously corroded. In this study, to study on the corrosion characteristics of Al-alloy shell for cooler, the electrochemical polarization test of materials for the marine fresh water cooler such as Al-alloy, Cu and naval brass was carried out in fresh water. And thus the polarization resistance and anodic polarization behavior of Al-alloy, Cu and naval brass are investigated. Also, galvanic corrosion characteristics of AI-alloy coupled with Cu and naval brass is considered. The main results obtained are as follows；(1) The current density of corrosion is high in order of Al-alloy> naval brass> Cu (2) As anodic potential increases, the corrosion resistance of naval brass is better than that of Cu. (3) The galvanic corrosion of Al-alloy coupled with Cu and naval brass is activated than corrosion of Al-alloy.