材料と環境
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
電位分布解析による塗覆装欠陥付き埋設鋼管の陰極防食評価
足立 晴彦柴田 睦笠原 晃明
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1991 年 40 巻 1 号 p. 19-25

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Potential fields formed by the alternating and direct currents flowing into a coating holiday on a buried steel pipeline were analyzed by means of the multi-electrode mapping method. Simulated field experiments demonstrated that the AC potential field analysis permits an accurate trenchless estimation of the location and the size of coating holidays, whereas the DC potential field analysis permits a correct trenchless assessment of the true level of cathodic protection at respective holidays. The effectiveness of the method was also demonstrated on the existing pipelines. Theoretical background and the results of field experiments are given.
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