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Specific protection of pipeline against stray d.c. currents using high auality insulating coatings

机译：对管道的特殊保护以防止直流杂散使用高质量绝缘涂层的电流

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摘要

Stray d.c. current influence on pipe/soil potential in pipelines coated with high auality insulating coatings is specific. When measuring on-potentials (E_(on)) along the pipeline, it can be concluded that the influence of stray currents is spread over a large area. However, there is usually no current flow between the pipeline and the soil, because of the general lack of coating defects. The values and the pattern of changes in the stray current depend, among others, on the distance between the reference electrode and the coating defect. Interference assessment is difficult and using the conventional correlation techniaue may lead to faulty conclusions that there is a risk of corrosion, when infact there is none. On the other hand, new opportunities have emerged in the area of corrosion protection of such pipelines, including interaction characteristics modulation.
机译：流浪直流电流对涂有高绝缘层的管道中的管道/土壤电位的影响是特定的。当测量沿管道的导通电位（E_（on））时，可以得出结论，杂散电流的影响分布在很大的区域。但是，由于通常缺乏涂层缺陷，因此在管道和土壤之间通常没有电流流动。杂散电流变化的值和模式尤其取决于参考电极和涂层缺陷之间的距离。干扰评估很困难，使用常规的相关技术可能会得出错误的结论，即实际上没有腐蚀的风险。另一方面，在这种管道的腐蚀防护领域出现了新的机会，包括相互作用特性的调节。

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