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

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  • 須藤 皓
    東北電力株式会社電力技術研究所
  • 春山 志郎
    東京工業大学工学部 現在東京工業高等専門学校

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タイトル別名
  • Current Profile between Probe Electrode and Large Scale Buried Installation in Polarization Resistance Measurement
  • 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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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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