Assessment of cathodic protection effect on long‐distance gas transportation pipelines based on buried steel specimens,Materials and Corrosion

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Assessment of cathodic protection effect on long‐distance gas transportation pipelines based on buried steel specimens
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-11-23 , DOI: 10.1002/maco.202012020
Guoxi He ₁ , Hao Peng ₁ , Kexi Liao ₁ , Minan Wang ₁ , Shuai Zhao ₁ , Jihui Leng ₁

Affiliation

Different severe corrosions are found at the damaged point of anticorrosive coating on natural gas pipelines, even though the cathodic protection (CP) potential is between −0.85 and −1.15 V. Therefore, there are totally 168 buried steel specimens (BSSs) and 28 soil samples at 28 buried points that are taken out in situ and then analyzed in the lab to assess the CP effectiveness. First, the CP status is simulated by BSSs at the damaged points, and the corrosion products on BSSs are analyzed microscopically. Second, the corrosion rates of the testing BSSs are calculated by the weight‐loss method to perform the quantitative assessment. Third, the specific reasons for external corrosion are explored via analyzing the CP potential attenuation tendency and the corrosiveness of soil. The corrosion growth trend is also investigated by comparing the test results among three test cycles within 8 years. Finally, the control measures for external corrosion of pipelines are put forward. The study is beneficial to evaluate the CP system and determine the causes of external corrosion of pipelines, thereby formulating corresponding protective measures.

中文翻译：

基于埋藏钢试样的长距离输气管道阴极保护效果评估

即使阴极保护（CP）电位在-0.85至-1.15 V之间，天然气管道防腐蚀涂层的损坏点也会发现不同的严重腐蚀。因此，总共有168个埋地钢标本（BSSs）和28个土壤在28个埋藏点取样，然后现场取样，然后在实验室中进行分析以评估CP的有效性。首先，通过BSS在损坏点模拟CP状态，并在微观上分析BSS上的腐蚀产物。其次，通过减重法计算出测试BSS的腐蚀速率，以进行定量评估。第三，通过分析CP电位衰减趋势和对土壤的腐蚀性，探讨了造成外部腐蚀的具体原因。还通过比较8年内三个测试周期的测试结果来研究腐蚀的增长趋势。最后提出了管道外部腐蚀的控制措施。该研究对于评估CP系统并确定管道外部腐蚀的原因，从而制定相应的防护措施是有益的。

更新日期：2020-11-23

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