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Korean Journal of Metals and Materials > Volume 55(5); 2017 > Article
Korean Journal of Metals and Materials 2017;55(5): 348-356. doi: https://doi.org/10.3365/KJMM.2017.55.5.348
온도 및 유속이 선박의 음극방식 및 수중 전자기장 신호 특성에 미치는 영향
김용상1, 김경민1, 이상규2, 김정구1
1성균관대학교 신소재공학부
2국방과학연구소 제6기술연구본부
Effect of Temperature and Flow Velocity on the Cathodic Protection of Ships and Underwater Electromagnetic Signatures
Yong-Sang Kim1, Kyoung-Min Kim1, Sangkyu Lee2, Jung-Gu Kim1
1School of Advanced Materials Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
2The 6th Research and Development Institute, Agency for Defense Development, Changwon 51678, Republic of Korea
Correspondence  Jung-Gu Kim ,Tel: +82-31-290-7360, Email: kimjg@skku.ac.kr
Received: 6 October 2016;  Accepted: 24 November 2016.  Published online: 9 May 2017.
ABSTRACT
The effects of the temperature and flow velocity on the cathodic protection and underwater electromagnetic signature of ships are investigated using electrochemical tests and boundary element simulations. The corrosion resistance of the materials for the hull and propeller increase at lower temperatures, and the corrosion resistance is significantly decreased under the flow conditions because the oxygen concentration on the surface accelerates the cathodic reaction. Due to the corrosion resistance reduction, the current requirement for cathodic protection increases under the flow conditions, while it decreases at lower temperatures. Furthermore, the underwater electromagnetic field is investigated at different axis directions. The electromagnetic field increases under the flow conditions and at higher temperatures due to the increase in the applied current for cathodic protection.
Keywords: cathodic protection, ocean, corrosion, electromagnetic signature, hull, propeller
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