小口径管道腐蚀及防护策略研究进展

doi:10.11896/cldb.19060044

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Abstract In China, the demand for petroleum resources is increasing since the rapid development of the industry. While the regional differences in oil and gas resources distribution have brought enormous challenges to the transportation of resources. Oil-gas gathering and transferring pipelines are widely used in the petroleum and petrochemical industry, because they are helpful to transport oil and gas resources effectively. However, oil-gas gathering and transferring pipelines are exposed to soil, water or atmosphere environment, and they also have some prominent characteristics, such as small caliber, large number, short distance and having difficulty in inner wall corrosion protection. As a result, it is of scientific and engineering value to study corrosion matters on small-bore oil and gas gathering pipelines.
In the outer wall anticorrosion of small-bore pipes, the traditional petroleum asphalt anti-corrosion coatings, such as petroleum asphalt and coal asphalt, are adopted widely because of low cost. Despite the fact, the mechanical strength and temperature toughness of these coatings are inferior. Thus, they are susceptible to bacterial corrosion. Given this circumstance, adding other resins to improve coating performance has caused continuous concern in the scientific community; when it comes to internal corrosion protection, the general anticorrosion techniques are limited due to the high complexity construction of small-diameter pipelines, the existence of welding heat-affected zones and the lag of fill-in technology. The way to add corrosion inhibitors is not universally employed because of the high cost. In order to solve these problems, some new internal anti-corrosion technologies have been developed at home and abroad.
In this paper, the environmental factors of the small-diameter pipelines' outer wall, including atmospheric corrosion, soil corrosion, and sea-water corrosion, are introduced firstly, and then the anti-corrosion technologies of three-layer polyethylene (3PE) and melted epoxy powder are discussed. Notably, the traditional coating of inner wall anticorrosive has difficulty in spraying each location on account of the narrow diameter of small-diameter pipelines, so the inner wall corrosion of small-diameter pipelines has become a potential hazard in engineering applications. Considering this situation, we analyze the main corrosion factors of the inner wall of the pipeline, and how these factors affect the inner wall corrosion. In addition, we discuss the commonly used anti-corrosion technologies of the inner wall, and we also forecast the future development trend of anti-corrosion measures for small-caliber pipelines.

Key words： pipeline small-bore outer wall anticorrosion internal corrosion anticorrosion

Published: 05 November 2020

CLC number:

TG171

About author:: Siquan Wang received his B.S. degree in mechanical design manufacture and automation major from Qingdao University of Technology in 2017. He is currently pur-suing his master’s degree at the School of Materials Science and Engineering, China University of Petroleum (East China) under the supervision of Prof. Yan Li and associate professor Jiantao Qi. His research has focused on design of in-situ monitoring system for sulfur recovery unit.
Yan Li received his B.S. and Ph.D. degrees in metallurgy of nonferrous metals from Northeastern University in 1995 and 2000, respectively. After one-year postdoctoral research at Institute of Oceanography, Chinese Academy of Sciences, he became a researcher and doctoral supervisor in 2001 and 2004, respectively. Then he won the First Prize of Shandong Provincial Science and Technology Progress Award in 2001 and the First Hundred Outstanding Introduced talents of Qingdao in 2002. In December 2004, he visited Tokyo Institute of Technology (Japan) as a scholar. In December 2009, he was appointed as the professor of China University of Petroleum (East China) and then as the doctoral supervisor in January 2010. He was the deputy secretary-general of Shandong and Qingdao Society for Corrosion and Protection and the deputy director of Specialized Committee of Water Treatment and Organic Heat Carrier, Shandong Special Equipment Society in 2014 and 2015, respectively. In 2017, he was selected as the vice chairman of Specialized Committee of Corrosion and Protection in Oil and Gas Fields and Pipeline, Chinese Society for Corrosion and Protection. His research interest is corrosion electrochemistry, including marine corrosion, environmentally sensitive fracture, anticorrosive coatings, corrosion inhibitors, corrosion monitoring, and mathematical modeling.
Jiantao Qi received his bachelor’s degree in the College of Chemical Engineering, China University of Petroleum (CUP, East China) in 2011 and the doctoral degree from Corrosion and Protection Centre, School of Materials, University of Manchester in 2015. He has rich engineering and research experience as an independent postdoc researcher, competing the LATEST 2 project with Prof. George Thompson (OBE, RAE Fellow) at University of Manchester and the NEPAL FUI project in the PCS lab (ENSCP-CNRS) with cooperation of Prof. Philippe Marcus. He started as a lecturer in the CUP in June 2016 and was promoted to be a full associate professor and supervisor of master students in Dec. 2017. His research focuses on corrosion and protection of alloys, including surface modification, functional conversion coatings, physics and chemistry at the surface and interface, SERS Raman, XPS, RBS, electrochemical assessments, and corrosion protection strategy.

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Cite this article:

WANG Siquan,CHEN Shibo,LI Yan, et al. Advances in Corrosion and Prevention of a Small-bore Piping[J]. Materials Reports, 2020, 34(19): 19166-19172.

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http://www.mater-rep.com/EN/10.11896/cldb.19060044 OR http://www.mater-rep.com/EN/Y2020/V34/I19/19166

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