• Corrosion Science and Technology
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• 제6권6호
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• pp.308-310
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• 2007

The owner of underground metallic structures (gas pipeline, oil pipeline, water pipeline, etc) has a burden of responsibility for the corrosion protection in order to prevent big accidents like gas explosion, soil pollution, leakage and so on. So far, Cathodic Protection(CP) technology have been implemented for protection of underground systems. The stray current from DC subway system in Korea has affected the cathodic protection (CP) design of the buried pipelines adjacent to the railroads. In this aspect, KERI has developed a various mitigation method, drainage system through steel bar under the rail, a stray current gathering mesh system, insulation method between yard and main line, distributed ICCP(Impressed Current Cathodic System), High speed response rectifier, restrictive drainage system, Boding ICCP system. We installed the mitigation system at the real field and test of its efficiency in Busan and Seoul, Korea. In this paper, the results of field test, especially, distributed ICCP are described.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.773-776
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• 2008

해양환경에서 철근 콘크리트의 부식은 매우 심하며, 염해는 콘크리트 교량과 항만 구조물의 부식을 일으키는 주요 요인 중 하나이다. 특히 비말대 및 간만대의 수면 부분은 구조물의 안전과 수명의 관점에서 볼 때 매우 중요하다. 지난 수십 년간 토목, 건축분야에서 콘크리트구조물 부식을 억제하기 위한 방식법 중 음극방식(cathodic protection, CP)은 많은 발전을 이룩하였으며 이제 보편화되는 추세에 있다. 최근 해양환경에서 콘크리트구조물의 음극방식을 위해 아연 메쉬 희생양극법이 개발 소개되었으나 아직까지도 이에 대한 구체적 내용이 잘 알려지지 않은 상태이다. 따라서 본 연구에서는 아연 메쉬 음극방식이 환경인자에 따라 콘크리트교각에 어떤 영향을 미치는지에 대하여 조사하였다. 아연 메쉬와 철근의 거리에 따라 음극방식 효과를 측정하기 위하여 약 100cm의 파일 시험편에 10cm 세그먼트 철근 8개를 설치하였으며, 아연 메쉬 희생양극에 의한 음극방식의 설계에 관련된 정보를 얻고자 파일 시험편의 높이에 따른 음극방식 전위의 변화와 전류의 감소치를 측정하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.663-665
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• 2001

Generally, the owners of the facilities adopt CP(Cathodic Protection) Systems to protect the corrosion accidents previously. The developed countries have secured the standard of CP systems and its test methods through the various researches and consolidation of the rules. So, we have been studying the international standards; JSEC, NACE Standard, ASTM, DNV, Australian Standard etc. and standardizing the systems and its test methods to apply in Korea.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.633-636
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• 2003

Most of maritime metallic structures are adopted a CP(Cathodic Protection) System for protection of corrosion in advanced country. So, we had been developed a remote corrosion monitoring control system. And we want to know the characteristics of efficiency, reliability, durability and so on. On the view point of it, we have to test in real field. in terms of design, cathodic protection systems, corrosion monitoring systems and optimal corrosion control systems compare to general commercial products. So, these systems have being studied to improve their capability. In this paper, the result of field testing center design of intelligent cathodic protection system including anodes, a real-time wireless remote corrosion monitoring and corrosion control system are described in naval ports.

• 한국항만학회지
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• 제12권1호
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• pp.145-154
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• 1998

Protection characteristics of the corroded steel pile which was served as a pier structure over 8 years in seawater have been examined in terms of corrosion potential, electrochemical impedance spectroscopy(EIS) and anodic/cathodic polarization curves. The steel structure was sectioned into two parts, waterline(splash zone, just above the seawater surface) and in-water(underwater), and protection characteristics for the two parts were investigated with the application of cathodic protection(CP) by sacrificial anodes using Zn and Al alloys. The main results obtained were as follows; (1) The corrosion potential of waterline zone was higher than that of in-water, which implied that the corrosion of waterline was more severe than that of in-water, (2) As a result of EIS examination, the transition period from the apparent CP to the substantial CP took about twenty to thirty days according to the corrosion condition.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.249-252
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• 2002

Recently, the advanced countries are using the corrosion monitoring system in a chemical plant and an oil tank in order to protect the corrosion because it leads to a big accident, pollution of soil. and lose of money Generally. the owners of the facilities adopt CP(Cathodic Protection) systems to protect the corrosion also. However, a CP system for oil tank was not considered in Korea Moreover they didn't adopted a corrosion monitoring system. In this paper, we have been developed not only the remote automatic corrosion monitoring but also the remote corrosion control system using the high efficiency CP rectifier. This results should be used to operate the CP system effectively and economically. And also it will be possible to extend the expectation life of the Oil tanks.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.253-256
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• 2002

Generally, the owners of the facilities adopt CP(Cathodic Protection) Systems to protect the corrosion accidents previously. The developed countries have secured the standard of CP systems through the various researches and consolidation of the rules. So in the first stage. I had been studied the international standards; JSCE, NACE Standard, ASTM, DNV, Australian Standard etc. and standardized the CP systems about items performance. specifications and so on. In this thesis, I have been studying the results of standardization of performance test methods of CP rectifier to apply in Korea.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.644-647
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• 2002

Generally. the owners of the facilities adopt CP(Cathodic Protection) Systems to protect the corrosion accidents previously. The developed countries have secured the standard of CP systems through the various researches and consolidation of the rules. So in the first stage, I had been studied the international standards: JSCE, NACE Standard. ASTM, DNV, Australian Standard etc. and standardized the CP systems about items, performance. specifications and so on. In this thesis, I have been studying the results of standardization of performance test methods of CP system to apply in Korea.

• Corrosion Science and Technology
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• 제4권6호
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• pp.242-249
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• 2005

A lot of parts in FGD (Flue Gas Desulfurization) systems of fossil-fuel power plants show the environments in which are highly changeable and extremely acidic corrosive medium according to time and locations, e.g. in duct works, coolers and re-heaters etc. These conditions are formed when system materials are immersed in fluid that flows on them or when exhausted gas is condensed into thin layered acidic medium to contact materials of the system walls and roofs. These environments make troublesome corrosion and air pollution problems that are occurred from the leakage of the condensed solution. To cathodically protect the metallic structures in extremely acidic fluid, the properties of the protective coatings on the metal surface were very important, and epoxy Novolac coating was applied in this work. On the base of acid immersion tests, hot sulfuric acid decreased the hardness of the coatings and reduced greatly the content of $Na_2O$, $Al_2O_3$, and $SiO_2$ among the main components of the coating. A special kind of CP(Cathodic Protection) system has been developed and tested in a real scale of the FGD facility. Applied coating for this CP system was peeled off and cracked in some parts of the facility. However, the exposed metal surface to extremely acidic fluid by the failure of the coatings was successfully protected by the new CP system.

• 한국가스학회지
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• 제12권1호
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• pp.19-24
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• 2008

산업화, 도시화에 따라 관리 주체가 다른 지중 금속시설물들이 크게 늘고 있으며 이러한 시설물의 보호를 위한 전기방식법, 특히 외부전원법의 적용이 전기방식에 대한 인식의 확산과 더불어 크게 증가하고 있다. 그러나 시스템의 설치를 위한 공간 확보의 어려움과 더불어 시설물 상호간의 표류전류 간섭 문제가 개별 관리주체로서는 해결할 수 없는 현안이 되고 있다. 이에 본 논문에서는 개별적으로 적용되던 전기방식 시스템 상호간의 간섭 사례를 현장 진단을 통하여 예시하고 이에 대한 대책으로 공용양극 외부전원 시스템을 설계, 현장 실증을 통하여 하나의 대안으로 제시하였다.