环境及防腐层特性对集输管道外腐蚀的影响规律

doi:10.11902/1005.4537.2025.310

中国腐蚀与防护学报

2026, Vol. 46

Issue (4): 1249-1256 CSTR: 32134.14.1005.4537.2025.310 DOI: 10.11902/1005.4537.2025.310

研究报告

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环境及防腐层特性对集输管道外腐蚀的影响规律

庞钰¹, 张文艳¹(

), 庞榆², 王锡伟³, 汪凤⁴, 凌涛强⁴, 李文坡⁴(

)

^1.中国石油西南油气田公司地面工程设计中心成都 610021
^2.中国石油西南油气田公司勘探开发研究院成都 610041
^3.中国石油西南油气田公司勘探事业部成都 610041
^4.重庆大学化学化工学院重庆 400030

Influence of Factors Related with Environment and Anti-corrosion Coating on External Corrosion of Gathering and Transport Pipelines

PANG Yu¹, ZHANG Wenyan¹(

), PANG Yu², WANG Xiwei³, WANG Feng⁴, LING Taoqiang⁴, LI Wenpo⁴(

)

^1.Surface Engineering Design Center, PetroChina Southwest Oil & Gasfield Company, Chengdu 610021, China
^2.Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China
^3.Exploration Department, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
^4.College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China

引用本文:

庞钰, 张文艳, 庞榆, 王锡伟, 汪凤, 凌涛强, 李文坡. 环境及防腐层特性对集输管道外腐蚀的影响规律[J]. 中国腐蚀与防护学报, 2026, 46(4): 1249-1256.
Yu PANG, Wenyan ZHANG, Yu PANG, Xiwei WANG, Feng WANG, Taoqiang LING, Wenpo LI. Influence of Factors Related with Environment and Anti-corrosion Coating on External Corrosion of Gathering and Transport Pipelines[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(4): 1249-1256.

全文: PDF(13551 KB) HTML

摘要:

围绕3PE防腐层性能、土壤环境及腐蚀产物展开测试，选取管道保护端、非保护端及补口位置进行对比，分析环境与防腐层特性对外防腐的影响。测试结果表明，保护端的拉伸强度为8.51~9.92 MPa，断裂伸长率为396.94~446.01%，防腐层性能最好；保护端的Cl^-浓度为2.99 mg/g，明显高于非保护端，但保护端的腐蚀程度仍较轻，这充分验证了阴极保护措施的有效性。腐蚀产物分析表明，腐蚀产物形成于氧化性环境，铁氧化物为主要的腐蚀产物。经过水分、Cl^-、温度和防腐层的拉伸强度等因素共同作用，破坏防腐层的防护性能。由此可知，可以为管道的外防腐层的维护和管理提供更有力的支持。

关键词 ： 3PE防腐层, 土壤环境, 腐蚀产物, 力学性能, 腐蚀机理

Abstract：

An underground natural gas pipeline with three-layered polyethylene anti-corrosion coating operated in conditions of internal pressure 7.28 Mpa, at 61.87 ℃ for 1425 d. Next, steel pipe samples were collected from three typical sections of the pipeline (namely the cathodic protection end, the non-protection end, and the pipeline connection area). Then the effectiveness of protection for these three sections was comparatively assessed by means of tensile tester, hardness tester, characterization of corrosion morphology and corrosion products, as well as analysis of soil extract etc. While the influence of factors related with environment, corrosion products, and the three-layered polyethylene anti-corrosion coating on the corrosion behavior of pipeline steel was also revealed. The test results showed that the tensile strength of the pipe steel on the protection end was 8.51-9.92 MPa, the elongation at break was 396.94%-446.01%, thus, where the anti-corrosion mearsure exhibited the best performance. The Cl^- concentration at the protection end was 2.99 mg/g, which was significantly higher than that at the non-protection end, but the corrosion degree at the protection end remained light, which fully verified the effectiveness of cathodic protection measures. Through the analysis of corrosion products, it is found that corrosion products are formed in oxidizing environment, and the corrosion products composed mainly of iron oxides. Based on the above analysis, it can be concluded that factors such as moisture, Cl^-, temperature, and strength of the anti-corrosion coating may act together to deteriorate the protective performance of the anti-corrosion coating. This study provides meaningful reference for the maintenance and management of the external anti-corrosion coating for pipelines.

Key words： 3PE anti-corrosion layer soil environment corrosion products mechanical properties corrosion mechanism

收稿日期: 2025-10-04 32134.14.1005.4537.2025.310

ZTFLH:

TG174

基金资助:特高含硫气田地面集输系统腐蚀控制与监检测关键技术研究(2024D105-01-04)

通讯作者: 张文艳，E-mail：2419594311@qq.com，研究方向为材料腐蚀与防护；
李文坡，E-mail：wpli@cqu.edu.cn，研究方向为金属腐蚀与防护、缓蚀剂

Corresponding author: ZHANG Wenyan, E-mail: 2419594311@qq.com;
LI Wenpo, E-mail: wpli@cqu.edu.cn

作者简介: 庞钰，女，1997年生，硕士生，工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.310 或 https://www.jcscp.org/CN/Y2026/V46/I4/1249

表1 防腐层性能测试结果

表2 防腐层在不同温度下的压痕硬度对比

Ionic composition	No.1 concentration / mg·g^-1	No.2 concentration / mg·g^-1
K⁺ + Na⁺	2.3604	2.3604
Ca²⁺	0.5012	0.3206
Mg²⁺	0.7292	0.243
Fe²⁺	0.1804	0.0768
Fe³⁺	0.0636	0.006
Cl^-	1.9994	2.99
CO $3 2 -$	0	0
HCO $3 -$	0	0.6102
S^2-	0.0644	0.0644
SO $4 2 -$	6.65	2.0414
Salinity	12.5616	8.7004
Water type	Na₂SO₄	Na₂SO₄
pH	6.85	6.93

表3 土壤浸出液离子分析结果

图1 不同管道腐蚀产物的XRD图谱

图2 不同管道腐蚀产物的Raman图谱

图3 不同管道腐蚀产物的XPS图谱

图4 不同管道腐蚀产物的SEM像及EDS谱

图5 不同管道防腐层的红外光谱图

图6 在阴极保护下的外防腐层的腐蚀原因分析

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