Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of RuCl3 Concentration on the Lifespan of Insoluble Anode for Cathodic Protection on PCCP

  • Cho, H.W. (Materials Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Chang, H.Y. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Lim, B.T. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Park, H.B. (Power Engineering Research Institute, KEPCO Engineering & Construction Company) ;
  • Kim, Y.S. (Materials Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
  • Received : 2015.07.14
  • Accepted : 2015.08.28
  • Published : 2015.08.31
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Abstract

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, $M]^{-0.97}$.

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