Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Influences of Coatings and Solution Corrosivity on Cathodic Protection of Metallic Materials

  • Yoo, Y.R. (School of Advanced Materials Engineering, Andong National University) ;
  • Chang, H.Y. (Korea Power Engineering Company Inc.) ;
  • Jin, T.E. (Korea Power Engineering Company Inc.) ;
  • Kim, Y.S. (School of Advanced Materials Engineering, Andong National University)
  • Published : 2006.06.01
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Abstract

Painting has protected metallic stack but the paint films may be degraded and corrosion problem can be arisen. To protect the painted metal stack, cathodic protection can be applied. If cathodic protection is applied to bare metal, only small area may be protected. However, if cathodic protection is applied to painted metal surface, large area can be protected and the lifetime of paint films can be extended. High corrosion resistant alloys were corroded at a Flue Gas Desulfurization (FGD) facility of power plant within a short period and thus cathodic protection can be used to protect these metals. On the base of computer simulation, if cathodic protection is applied to bare metal in a FGD environment, it was estimated that applied current could almost be spent to protect area near the anode. However, if cathodic protection is applied to high resistant-coated metal, the much larger area from the anode could be effectively protected.

Keywords

References

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