• Title/Summary/Keyword: Cathodic Protection System

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A Study on Analysis Method of Underwater Electric Field Signature due to Ship's Corrosion and Corrosion Protection System (선체 부식 및 부식 방지장치에 의한 수중 전기장 신호 해석 방안 연구)

  • Chung, Hyun-Ju;Yang, Chang-Seob;Jeon, Jae-Jin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.11 no.2
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    • pp.43-52
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    • 2008
  • The galvanic corrosion of a vessel, or systems fitted to minimize the ship's corrosion such as ICCP (Impressed Current Cathodic Protection) system and sacrificial anodes, can lead to significant electrical current flow in the sea. The presence of vessel's current sources associated with corrosion will give rise to detectable electric field surrounding the vessel and can put it at risk from mine threats. For this reason, it is necessary to design corrosion protection systems so that they don't only prevent a hull corrosion but also minimize the electric field signature. In this paper, we describe theoretical backgrounds of underwater electric field signature due to corrosion and corrosion protection system on naval vessels and analysis results of the electric field according to the ship's hull and it's propeller coating damage and ICCP anode displacement.

Characteristics and Measurement Method of the Underwater Electromagnetic Signature Emitted from a Naval Ship (함정 발생 수중 전자기장 신호의 특성 및 측정 기법)

  • Yang, Chang-Seob;Chung, Hyun-Ju;Shin, Seung-Je
    • Journal of the Korea Institute of Military Science and Technology
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    • v.9 no.2 s.25
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    • pp.11-19
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    • 2006
  • The underwater electromagnetic signatures of a naval ship are mainly generated from three sources which are the permanent and induced magnetic field in the ship's hull and other ferrous components, the cathodic current electromagnetic field established by the Impressed Current Cathodic Protection(ICCP) system or the Sacrificial Anode and the stray electromagnetic fields generated by onboard equipment. These signatures can be minimized by certain design methods or installation of signature reduction equipment. In this paper, we represented the characteristic of the underwater electromagnetic signature and the signature reduction techniques for a naval ship. Also, we measured the electromagnetic field changes emitted from the real ship using the Electric and Magnetic field Measurement System(EMMS). We found that the underwater electromagnetic signature for a naval ship can be used as input or trigger signal in a surveillance system and an influence mine.

The Development of Remote Corrosion Monitoring and Control System for Oil Tank by using the High Efficiency CP Rectifier (고효율 전기 방식용 정류기를 이용한 유류탱크의 원 방식 제어 시스템 개발)

  • Bae, Jeong-Hyo;Ha, Tae-Hyun;Lee, Hyun-Goo;Kim, Dae-Kyeong
    • Proceedings of the KIEE Conference
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    • 2002.11d
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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.

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Chracterization of Ng alloy with dry and wet backfill under accelerated C.P. condition (백필 상태에 따른 마그네슘 양극의 가속수명시험 특성에 관한 연구)

  • Park, Kyung-Wha;Kim, Dae-Kyeong;Bae, Jeong-Hyo;Ha, Tae-Hyun;Lee, Hyun-Goo;Ha, Yoon-Cheol
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.1933-1935
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    • 2005
  • In this investigation, the electrochemical behaviour of magnesium alloy anode was studied by using electrochemical methods and the performance of magnesium alloy anode was observed with dry and wet backfill under accelerated cathodic protection. This paper reports the data collected at the laboratory and field sites over one year exposure of magnesium anode under cathodic protection donditions.

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A Study on Underwater Electro-magnetic Signature Prediction Due to Hull Corrosion of a Naval Ship (함정의 선체 부식에 의한 수중 전자기 신호 예측에 관한 연구)

  • Chung, Hyun-Ju;Yang, Chang-Seob;Ju, Hae-Sun;Jeon, Jae-Jin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.15 no.2
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    • pp.177-185
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    • 2012
  • Corrosion currents flow through the seawater due to the different electrochemical potential between a hull and a propeller under the draft line of ship. Additionally, in order to protect the hull and other sensitive anodic parts of the ship from corrosion, the corrosion protection system, called impressed current cathodic protection(ICCP) equipment has been installed in most naval ships. Those currents could be harmful to the electromagnetic silencing of the naval ship because sea mines are triggered by even a feeble field value. In this paper, we described electric and corrosion related magnetic fields by ship's galvanic corrosion and a corrosion protection system, and prediction results of electric and corrosion related magnetic fields at any depth for the model ship.

A Study of Corrosion Resistance and Torque in Bolt Coated with Magni 565 (Magni 565 코팅 볼트의 내식성 및 토오크 특성에 대한 연구)

  • Kim, Sang-Soo;Kim, Moo-Gil;Jung, Byong-Ho
    • Journal of the Korean Society for Heat Treatment
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    • v.20 no.4
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    • pp.195-202
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    • 2007
  • Corrosion resistance and torque of M10 bolt coated with Magni 565 were investigated. Corrosion protection mechanism were also studied with the microstructure of coating film. The bolts with the optimum conditions showed around $10{\mu}m$ layer thickness, a great corrosion resistance in salt spray test and a proper torque in torque/tension test. But torque coefficient k increased with the number of bolting and clamping force of M10 bolt showed significantly lower than that of specified value 28.3kN. It was thought that the repeated bolting made the coating film peel off and powdery. The sample coated with optimum coating conditions showed more higher polarization resistance and corrosion potential than the specimens of top and base coat only. The base coating film was composed of lamellar zinc flakes, which provides a large sacrificial cathodic protection. Meanwhile, the top coating film was composed of organic aluminium pigments layer, which provides barrier protection to the corrosion circumstances.

Application of Cathodic Protection on Metallic Structure in Extremely Acidic Fluids

  • Chang, H.Y.;Yoo, Y.R.;Jin, T.E.;Kim, Y.S.
    • Corrosion Science and Technology
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    • v.4 no.4
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    • pp.140-146
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    • 2005
  • Fossil fired power plant produces the electric energy by using a thermal energy by the combustion of fossil fuels as like oil, gas and coal. The exhausted flue gas by the combustion of oil etc. contains usually many contaminated species, and especially sulfur-content has been controlled strictly and then FGD (Flue Gas Desulfurization) facility should be installed in every fossil fired power plant. To minimize the content of contaminations in final exhaust gas, high corrosive environment including sulfuric acid (it was formed during the process which $SO_2$ gas combined with $Mg(OH)_2$ solution) can be formed in cooling zone of FGD facility and severe corrosion damage is reported in this zone. These conditions are formed when duct materials are immersed in fluid that flows on the duct floors or when exhausted gas is condensed into thin layered medium and contacts with materials of the duct walls and roofs. These environments make troublesome corrosion and air pollution problems that are occurred from the leakage of those ducts. The frequent shut down and repairing works of the FGD systems also demand costs and low efficiencies of those facilities. In general, high corrosion resistant materials have been used to solve this problem. However, corrosion problems have severely occurred in a cooling zone even though high corrosion resistant materials were used. In this work, a new technology has been proposed to solve the corrosion problem in the cooling zone of FGD facility. This electrochemical protection system contains cathodic protection method and protection by coating film, and remote monitoring-control system.

Effect of RuCl3 Concentration on the Lifespan of Insoluble Anode for Cathodic Protection on PCCP

  • Cho, H.W.;Chang, H.Y.;Lim, B.T.;Park, H.B.;Kim, Y.S.
    • Corrosion Science and Technology
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    • v.14 no.4
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    • pp.177-183
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    • 2015
  • Prestressed Concrete steel Cylinder Pipe (PCCP) is extensively used as seawater pipes for cooling in nuclear power plants. The internal surface of PCCP is exposed to seawater, while the external surface is in direct contact with underground soil. Therefore, materials and strategies that would reduce the corrosion of its cylindrical steel body and external steel wiring need to be employed. To prevent against the failure of PCCP, operators provided a cathodic protection to the pre-stressing wires. The efficiency of cathodic protection is governed by the anodic performance of the system. A mixed metal oxide (MMO) electrode was developed to meet criteria of low over potential and high corrosion resistance. Increasing coating cycles improved the performance of the anode, but cycling should be minimized due to high materials cost. In this work, the effects of $RuCl_3$ concentration on the electrochemical properties and lifespan of MMO anode were evaluated. With increasing concentration of $RuCl_3$, the oxygen evolution potential lowered and polarization resistance were also reduced but demonstrated an increase in passive current density and oxygen evolution current density. To improve the electrochemical properties of the MMO anode, $RuCl_3$ concentration was increased. As a result, the number of required coating cycles were reduced substantially and the MMO anode achieved an excellent lifespan of over 80 years. Thus, we concluded that the relationship between $RuCl_3$ concentration and coating cycles can be summarized as follows: No. of coating cycle = 0.48*[$RuCl_3$ concentration, $M]^{-0.97}$.

A Study on the Standardization of Performance Test Method for Cathodic Protection System in Korea (국내 전기방식 시스템의 성능평가를 위한 시험 방법에 대한 표준화 연구)

  • Bae, Jeong-Hyo;Ha, Tae-Hyun;Lee, Hyun-Goo;Kim, Dae-Kyeong;Lee, Ji-In;Kim, Suk-Won
    • Proceedings of the KIEE Conference
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    • 2002.07b
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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.

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Cathodic Protection Test and Feasibility Study on Remote Monitering System of Concrete Structure (콘크리트내 철근의 전기방식과 리모트 모니터링 시스템의 활용에 관한 연구)

  • 권기주;서용표;이경진;이장화;민병렬;이문환
    • Magazine of the Korea Concrete Institute
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    • v.10 no.3
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    • pp.209-218
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    • 1998
  • 본 연구에서는 콘크리트내 철근의 방식성을 검토하기 위하여 실제 구조물과 유사하도록 콘크리트 대형 패널 실험체를 제작하였으며, 실험체 제작시 콘크리트 내부에 염화물을 혼입하여 음극전기방식 공법을 도입한 실험체와 공법을 도입하지 않은 실험체의 염화물에 의한 철근방식효과를 비교 분석하였다. 실험에 사용된 음극전기방식은 비소모성 티타늄 양극망을 사용한 외부전원방식이며, 최근에 국내에서도 사용실적이 늘고 있는 리모트 모니터링 시스템을 적용하여 구조물의 유지관리상 연속성 있게 콘크리트내 철근의 방식정도를 확인할 수 있는지에 대해 검토하였다.