掺海水输送对海底管道结垢及腐蚀行为的影响

李慧心, 常炜, 李大朋, 李清平, 胡丽华, 于湉, 张雷

doi:10.16577/j.issn.1001-1560.2022.0243

材料保护 >

2022 , Vol. 55 >Issue 9: 34 - 40

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0243

试验研究

掺海水输送对海底管道结垢及腐蚀行为的影响

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(1. 中海油研究总院有限责任公司，北京 100028；2. 北京科技大学新材料技术研究院，北京 100083)

李慧心(1992-)，博士研究生，主要研究方向为海洋腐蚀与防护，电话：010-84525450，E - mail：lihx41@cnooc.com.cn

收稿日期: 2022-03-04

修回日期: 2022-04-19

录用日期: 2022-05-31

网络出版日期: 2023-12-23

基金资助

“十三五”国家科技重大专项(2016ZX05028 - 004)资助

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Effects of Seawater - Mixed Transportation on Scaling and Corrosion Behavior of the Submarine Pipeline

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(1. CNOOC Research Institute Co., Ltd., Beijing 100028, China;2. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China)

Received date: 2022-03-04

Revised date: 2022-04-19

Accepted date: 2022-05-31

Online published: 2023-12-23

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摘要

为了保障管道流动安全，明确管道掺海水输送方案的结垢及腐蚀风险，针对我国南海海域某油田现场的实际工况，分析了掺入海水后水质结垢倾向的变化，并模拟垢层沉积状态，开展了腐蚀模拟评价实验。利用失重法测试平均腐蚀速率，利用扫描电子显微镜及能谱仪进行腐蚀形态观察和腐蚀产物分析，并结合激光共聚焦显微镜观察基体表面腐蚀形态，探究了海水掺入对管线钢结垢腐蚀的影响。通过开展原位电偶腐蚀实验，探究了垢层沉积对管线钢腐蚀电化学行为的影响。结果表明：海底管道中海水的掺入比例及海水中腐蚀性离子的种类、含量影响海管输送系统的结垢风险。垢层的形成，一方面使管道内壁整体的腐蚀倾向有所减小；另一方面，沉积的垢层在基体表面不均匀分布改变基体表面电位状态，构成局部电偶电池，促进局部腐蚀坑的萌生与发展。

关键词： 管线钢; 掺海水输送; 结垢倾向; 垢下腐蚀; 局部腐蚀

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李慧心, 常炜, 李大朋, 李清平, 胡丽华, 于湉, 张雷 . 掺海水输送对海底管道结垢及腐蚀行为的影响[J]. 材料保护, 2022 , 55(9) : 34 -40 . DOI: 10.16577/j.issn.1001-1560.2022.0243

Abstract

In order to ensure the safety of pipeline flow and clarify the scaling and corrosion risks of seawater - mixed pipeline transportation scheme, the change of water scaling tendency after adding seawater was analyzed based on the actual on - site working conditions of an oil field in South China Sea, and the deposition state of scale layers was simulated to carry out corrosion simulation evaluation experiment. To study the effects of adding seawater on the scaling corrosion of pipeline steel, the average corrosion rate was tested by weight loss method, the scanning electron microscope and energy dispersive spectrometer were employed to observe the corrosion morphology and analyze the corrosion products, and the surface corrosion morphology of the substrate was observed by a laser confocal microscope. Meanwhile, in - situ galvanic corrosion experiments were carried out to investigate the effect of scale deposition on the electrochemical behavior of pipeline steel corrosion. Results showed that the proportion of seawater in the submarine pipeline and the type and content of corrosive ions in the seawater affected the scaling risk of the submarine pipeline transportation system. On the one hand, the formation of the scale layer reduced the overall corrosion tendency of the inner wall of the pipeline; on the other hand, the uneven distribution of the deposited scale layer on the surface of the substrate changed the potential state of the substrate surface, formed a local galvanic battery and thus promoted the emergence and development of local corrosion pits.

Key words： pipeline steel; seawater - mixed transportation; scaling tendency; under - deposit corrosion; localized corrosion

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