Current Profile between Probe Electrode and Large Scale Buried Installation in Polarization Resistance Measurement

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  • Sudoh Shiroshi
    Electricity Technology Research and Development Center Tohoku Electric Power Co. Ltd.
  • Haruyama Shiro
    Faculty of Enginearing, Tokyo Institute of Technology

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  • 分極抵抗測定における大型埋設構造物とプローブ電極間の電流線分布の理論的検討
  • ブンキョク テイコウ ソクテイ ニ オケル オオガタ マイセツ コウゾウブツ

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Abstract

Current profile between a large scale metallic object and a small probe electrode has been studied with the conformal mapping method, in connection with electrochemical corrosion monitoring of the installations buried in soil. It was found that a non-polarizable electrode must be used as the probe for obtaining the information regarding the corrosion rate of a large scale buried installation. The net polarization resistance was obtained by considering the current profile. It was proved that the rate of corrosion of a long object such as pipeline can be estimated to some extent by measuring the net resistance between the object and a non-polarizable probe electrode. In the case of a circular object such as bottom plate of storage tank, however, the corrosion rate can be estimated only by measuring the electrochemical impedance using a one-side exposed probe electrode.

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