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基于性能退化的沥青类防腐层保护效能影响规律的研究

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  • 1. 北京市燃气集团有限责任公司; 2. 北京科技大学新材料技术研究院; 3. 北京安科腐蚀技术有限公司
葛宝玉(1990-),工程师,硕士,从事油气管线的腐蚀与防护工作,电话:15216807587,E - mail:geby@ancorr.cn

收稿日期: 2021-11-26

  修回日期: 2021-12-14

  录用日期: 2021-12-31

  网络出版日期: 2024-01-08

Study on the Influence Law of Asphalt Anti - Corrosion Coating Protection Efficiency Based on Performance Degradation

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  • 1. Beijing Gas Group Co., Ltd., Beijing 100011, China;2. Institute for Advanced Materials Technology, University of Science and Technology Beijing, Beijing 100083, China;3. Beijing AnkocorrTechnology Co., Ltd., Beijing 102211, China

Received date: 2021-11-26

  Revised date: 2021-12-14

  Accepted date: 2021-12-31

  Online published: 2024-01-08

摘要

国内众多在役沥青防腐层管道的牺牲阳极阴极保护系统均已失效,或即将失效,重新更换牺牲阳极系统时若仍按照原有设计施工,可能会导致部分管道无法受到有效地保护。根据现场管道防腐层的面电阻率随时间变化规律,预测未来20 a内防腐层面电阻率变化情况,采用模拟计算的方法,预估已经运行15 a后管道的保护距离随时间的变化,为阴极保护系统重新设计提供依据。结果表明:在役沥青防腐层的面电阻率随埋地时间延长而降低,且降低速率逐渐减小;防腐层破损率随埋地时间的延长而增加,且增加速率逐渐增大;单组牺牲阳极保护系统运行15 a后管道的单侧保护距离为50 m,随着管道继续服役,单侧保护距离显著降低,第20,25,30,35 a时,单侧保护距离依次降为28.0,19.0,14.0,11.5 m; 当阳极距离管道1~4 m范围内,随着距离的增加,管道上的电位分布更加均匀,且保护距离增加;未来20~35 a内,更换牺牲阳极系统的时间对阳极寿命基本无影响,阳极寿命预估为23 a左右。

本文引用格式

张玉星, 车明, 葛宝玉, 张慎颜, 李旭, 王杰 . 基于性能退化的沥青类防腐层保护效能影响规律的研究[J]. 材料保护, 2022 , 55(5) : 63 -69 . DOI: 10.16577/j.issn.1001-1560.2022.0126

Abstract

In China, the sacrificial anode cathodic protection systems of many pipelines in service with asphalt coating have failed or are about to fail. If the sacrificial anode systems are replaced according to the original design, some pipelines could not be effectively protected. In this work, based on the surface resistivity change rule of the anticorrosive layer of on - site pipeline with time, the change of resistivity of the as - mentioned anticorrosive layer in the next 20 years was predicted. The change of protection distance of pipeline after 15 years of operation with time was estimated using simulation calculation, which provided a basis for the redesign of cathodic protection system. Results showed that the surface resistivity of anticorrosive layer of asphalt coating decreased with the prolonging of burried time, and the decreasing rate decreased gradually; the damage rate of anticorrosion coating increased with the prolonging of buried time, and the increase rate rised gradually. After 15 years of operation single group sacrificial anode protection system, the single - side protection distance of the pipeline was 50 m. And then with the continuous service of the pipeline, the single - side protection distance decreased significantly. After 20, 25, 30 and 35 years of operation, the single - side protection distance declined to 28.0, 19.0, 14.0 and 11.5 m, respectively. When the distance between the anode and the pipeline was in the range of 1~4 m, with the increase of such distance, the potential distribution on the pipeline became more and more uniform, and the protection distance increased. Furthermore, in the next 20~35 years, the replacement time of sacrificial anode system would have little impact on the anode life, which was estimated to be about 23 years.
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