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Korean Journal of Metals and Materials > Volume 55(8); 2017 > Article
Korean Journal of Metals and Materials 2017;55(8): 591-599. doi: https://doi.org/10.3365/KJMM.2017.55.8.591
경계요소법을 이용한 혼합형 음극방식 적용에 따른 수중 전자기장 감소 연구
김용상1, 고상진1, 이상규2, 김정구1
1성균관대학교 신소재공학부
2국방과학연구소 제6기술연구본부
Analysis of Underwater Electromagnetic Field Reduction by Mixed-type Cathodic Protection Using the Boundary Element Method
Yong-Sang Kim1, Sang Jin Ko1, 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: 7 March 2017;  Accepted: 8 May 2017.  Published online: 1 August 2017.
ABSTRACT
In this paper, the influence of mixed-type (impressed-current and sacrificial-anode) cathodic protection on an underwater electromagnetic field was investigated using the boundary element method. The current applied for cathodic protection was reduced by installing sacrificial anodes in the stern region. Also, the potential difference produced by the propeller in the stern region was decreased, due to the effective potential distribution generated by the sacrificial anode. The underwater electromagnetic signature decreased at 18 ℃ and 5 m/s, but not at 6 ℃. The difference in current density produced by the environment influenced the intensity of the electromagnetic field. The dramatic decrease in applied current at 6 ℃ increased the maximum electromagnetic signature. Thus, while the mixed-type cathodic protection effectively reduced the underwater electromagnetic signature, the design of the mixed-type cathodic protection should be optimized based on the environmental conditions, due to the sacrificial anode effect.
Keywords: cathodic protection, electromagnetic field, sacrificial anode, boundary element method, seawater
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