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

조현우; 장현영; 임부택; 박흥배; 김영식

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자료유형: 학술저널

저자정보: 조현우 장현영 임부택 박흥배 김영식

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제14권 제4호

발행연도: 2015.1

수록면: 177 - 183 (7page)

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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 RuCl3 concentration on the electrochemical properties and lifespan of MMO anode were evaluated. With increasing concentration of RuCl3, 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, RuCl3 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 RuCl3 concentration and coating cycles can be summarized as follows: No. of coating cycle = 0.48*[RuCl3 concentration, M]-0.97.

#cathodic protection #insoluble anode #MMO #Mixed Metal Oxide) #lifespan #ruthenium chloride #PCCP #Prestressed Concrete steel Cylinder Pipe)

참고문헌 (23)

참고문헌 신청

/ 1979 / ASTM A82-34, Standard Specification for Cold-Drawn Steel Wire for Concrete Reinforcement / ASTM

/ 1988 / ASTM A648-72, Standard Specification for Steel Wire, Hard Drawn for Prestressing Concrete pipe / ASTM

/ 1999 / AWWA C301-99, AWWA Standard for Prestressed Concrete Pressure Pipe, Steel-Cylinder Type / AWWA

/ 2007 / NACE TM0294, Testing of Embeddable Impressed Current Anodes for Use in Cathodic Protection of Atmospherically Exposed Steel-Reinforced Concrete / NACE International

A. E. Romer / 2004 / External Corrosion and Corrosion Control of Buried Water Mains / AWWARF

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