ABSTRACT In this paper, the statistical analysis of fluctuation characteristics of pipeline potential under dynamic DC stray current interference was carried out based on field test data. Then a self-designed experimental set-up was applied to study the corrosion behaviour of X70 steel in soil-simulating conditions. The statistical results showed that under the dynamic DC stray current interference, the pipeline potential was periodically fluctuated with dynamic periods between 10 and 300 s. The laboratory experiment results showed that there was a strong correlation between the corrosion rate and the dynamic period. When the dynamic period was less than 300 s, the corrosion rate was less than 22% of the predicted corrosion rate via Faraday’s law. Then corrosion mechanism was discussed based on a series of experimental measurment results. The interface capacitance effect, as well as the charge consumption by extra reaction, acted a significant part in depressing metal dissolution under dynamic DC stray current interference.

中文翻译：

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动态直流杂散电流干扰下管线钢的加速腐蚀

摘要 本文基于现场试验数据，对动态直流杂散电流干扰下管道电位波动特性进行了统计分析。然后应用自行设计的实验装置来研究 X70 钢在模拟土壤条件下的腐蚀行为。统计结果表明，在动态直流杂散电流干扰下，管道电位呈周期性波动，动态周期在10~300 s之间。室内实验结果表明，腐蚀速率与动态周期之间存在很强的相关性。当动态周期小于 300 s 时，腐蚀速率小于法拉第定律预测腐蚀速率的 22%。然后在一系列实验测量结果的基础上讨论了腐蚀机理。