Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Rate of Buried Pipeline by Alternating Current

  • Song, H.S. (R&D Division of Korea Gas Corporation) ;
  • Kim, Y.G. (R&D Division of Korea Gas Corporation) ;
  • Lee, S.M. (R&D Division of Korea Gas Corporation) ;
  • Kho, Y.T. (R&D Division of Korea Gas Corporation) ;
  • Park, Y.S. (School of Materials, Yonsei Univ.)
  • Published : 2005.02.01
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Abstract

An alternating current (AC) corrosion on buried pipeline has been studied using coupon and ER probe. Coupons and ER probes were applied to the sites from high value of AC voltage to low value based on the survey of AC voltages on buried gas transmission pipeline over the country. Parameters such as AC current density of coupon, AC voltage, cathodic protection potential, soil resistivity and frequency were monitored continually. Corrosion induced by AC was observed even under cathodically protected condition that met cathodic protection criterion (; below -850 mV vs. CSE). Corrosion rate was affected mainly not by AC voltage but by both of frequency and AC current density. An experimental corrosion rate relation could be obtained according to effective AC current density, in which AC corrosion rate increased linearly with effective AC current density, and its slope was 0.619 in coupon method and 0.885 in ER probes.

Keywords

References

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