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Influence of Anodic Current on Corrosion Protection Conditions of Buried Steel Pipeline Under Cathodic Protection

The influence of anodic current on the corrosion protection conditions of buried steel pipelines at a potential less noble than -0.85 V was evaluated in test cells simulating the pipelines under long-term cathodic protection. Results are discussed.

Product Number: 51317--9021-SG
ISBN: 9021 2017 CP
Author: Tomoyuki Nagai
Publication Date: 2017
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Cathodic protection is being applied to buried steel pipelines and polarized potential of pipelines is kept less noble than the protection potential criterion -0.85 V vs. Cu/CuSO4. However instantaneous anodic current has been infrequently observed in some fields even though polarized potential of pipelines is kept less noble than the protection potential criterion. In this study the influence of instantaneous anodic current on corrosion protection of buried steel pipelines under cathodic protection was evaluated and the oxidation reaction causing anodic current was investigated to some extent. As a result it was found that most of the anodic current was not attributed to corrosion reaction and the maximum value of corrosion rate of steel was as little as 1.8 ?m/year. Therefore it was considered that there was no matter on buried steel pipelines even though the instantaneous anodic current occurred under the protection potential criterion. It was estimated that some part of the anodic current was attributed to the oxidation reactions of components in soil and of rust on the steel surface.

Key words: Buried steel pipeline, Cathodic Protection, Stray current, Protection potential criterion, Instantaneous anodic current

Cathodic protection is being applied to buried steel pipelines and polarized potential of pipelines is kept less noble than the protection potential criterion -0.85 V vs. Cu/CuSO4. However instantaneous anodic current has been infrequently observed in some fields even though polarized potential of pipelines is kept less noble than the protection potential criterion. In this study the influence of instantaneous anodic current on corrosion protection of buried steel pipelines under cathodic protection was evaluated and the oxidation reaction causing anodic current was investigated to some extent. As a result it was found that most of the anodic current was not attributed to corrosion reaction and the maximum value of corrosion rate of steel was as little as 1.8 ?m/year. Therefore it was considered that there was no matter on buried steel pipelines even though the instantaneous anodic current occurred under the protection potential criterion. It was estimated that some part of the anodic current was attributed to the oxidation reactions of components in soil and of rust on the steel surface.

Key words: Buried steel pipeline, Cathodic Protection, Stray current, Protection potential criterion, Instantaneous anodic current

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