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

doi:10.11902/1005.4537.2025.310

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

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

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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

Cite this article:

PANG Yu, ZHANG Wenyan, PANG Yu, WANG Xiwei, WANG Feng, LING Taoqiang, LI Wenpo. Influence of Factors Related with Environment and Anti-corrosion Coating on External Corrosion of Gathering and Transport Pipelines. Journal of Chinese Society for Corrosion and protection, 2026, 46(4): 1249-1256.

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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

Received: 04 October 2025 32134.14.1005.4537.2025.310

ZTFLH:

TG174

Fund: Key Technologies for Corrosion Control and Monitoring & Detection in Surface Gathering Systems of Ultra-High Sour Gas Fields(2024D105-01-04)

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

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	PANG Yu
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	WANG Xiwei
	WANG Feng
	LING Taoqiang
	LI Wenpo

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.310 OR https://www.jcscp.org/EN/Y2026/V46/I4/1249

Table 1 Performance test results of the corrosion-resistant layer

Table 2 Comparison of indentation hardness of the anti-corrosion layer at different temperatures

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

Table3 Ion analysis results of soil leachate

Fig.1 XRD pattern of corrosion products from different pipelines: (a) corrosion sample 1, (b) corrosion sample 2, (c) corrosion sample 3

Fig.2 Raman spectra of corrosion products from different pipes: (a) corrosion sample 1, (b) corrosion sample 2, (c) corrosion sample 3

Fig.3 XPS spectra of corrosion products from different pipes: (a) corrosion sample 1, (b) corrosion sample 2, (c) corrosion sample 3

Fig.4 SEM images and EDS spectra of corrosion products from different pipes: (a) corrosion sample 1, (b) corrosion sample 2, (c) corrosion sample 3

Fig.5 Infrared spectra of different pipe coatings: (a) corrosion sample 1, (b) corrosion sample 2, (c) corrosion sample 3

Fig.6 Corrosion cause analysis of external anti-corrosion coating under cathodic protection

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