Influence of Cathodic Protection on Microbiologically Corrosion Behavior of Pipeline Steel in Marine Environments

doi:10.12422/j.issn.1006-396X.2026.02.006

Abstract

Abstract:

Microbiologically corrosion is a critical factor contributing to the degradation of marine engineering infrastructure.Electrochemical methods and slow strain rate tensile(SSRT) tests were employed to evaluate the effect of cathodic protection (CP) on the corrosion behavior of X70 pipeline steel in marine environments containing sulfate⁃reducing bacteria (SRB).Together with microstructural characterization,the stress corrosion cracking(SCC) mechanism of X70 steel in SRB⁃containing marine environments was analyzed.The results indicate that CP potentials of -0.775,-0.850 V promoted SRB growth.When the CP potential reached -1.000 V,it not only promoted the proliferation of SRB but also accelerated their transition into the decline phase.In the absence of applied stress,the optimal CP potential for X70 steel in SRB⁃containing marine environments was -0.850 V.Without CP,the SCC mechanism of X70 steel was a hybrid mode involving anodic dissolution induced by the marine environment and hydrogen⁃induced cracking caused by SRB.At CP potentials of -0.775,-0.850 V,the SCC mechanism was dominated by SRB⁃induced hydrogen⁃induced cracking.When the CP potential was -1.000 V,the SCC mechanism was a hybrid mechanism jointly induced by anodic dissolution caused by the marine environment and hydrogen⁃induced cracking induced by the CP potential.The synergistic effect of SRB and CP significantly increased the hydrogen embrittlement susceptibility of X70 steel in marine environments.

Key words: Pipeline steel, Marine environment, Cathodic protection, Sulfate reducing bacteria, Stress corrosion cracking

摘要：

微生物腐蚀是导致海洋工程装备失效的一个重要原因。采用电化学方法和慢应变速率拉伸试验（SSRT)评价了阴极保护（CP）对X70管线钢在含硫酸盐还原菌（SRB）的海洋环境中腐蚀行为的影响；结合微观表征分析了X70管线钢在含SRB的海洋环境中的应力腐蚀开裂(SCC)机制。结果表明，当CP电位为-0.775、-0.850 V时，能够促进SRB生长；当CP电位为-1.000 V时，在促进SRB繁殖的同时，加速SRB进入衰亡期；当无外加应力时，X70管线钢在含SRB的海洋环境中的最佳CP电位为-0.850 V；当无CP电位时，X70管线钢的SCC机制为海洋环境导致的阳极溶解和SRB导致的氢致开裂共同作用的混合机制；当CP电位为-0.775、-0.850 V时，SCC机制为SRB主导的氢致开裂；当CP电位为-1.000 V时，SCC机制为海洋环境导致的阳极溶解和CP电位导致的氢致开裂共同作用的混合机制；SRB和CP协同作用显著提高了X70管线钢在海洋环境中的氢脆敏感性。

关键词: 管线钢, 海洋环境, 阴极保护, 硫酸盐还原菌, 应力腐蚀

CLC Number:

TE832

Guoqing ZHANG, Sicheng QIAN, Bo SONG, Xu CHEN, Bing WANG. Influence of Cathodic Protection on Microbiologically Corrosion Behavior of Pipeline Steel in Marine Environments[J]. Journal of Petrochemical Universities, 2026, 39(2): 50-56.

张国庆, 钱思成, 宋博, 陈旭, 王冰. 阴极保护对海洋环境中管线钢微生物腐蚀行为的影响[J]. 石油化工高等学校学报, 2026, 39(2): 50-56.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.12422/j.issn.1006-396X.2026.02.006

https://journal.lnpu.edu.cn/syhg/EN/Y2026/V39/I2/50

Figures/Tables 9

Table 1 Mass fraction of chemical composition for X70 steel

组分	质量分数/%
C	0.045 0
Si	0.240 0
Mn	1.480 0
Cr	0.031 0
Ni	0.160 0
Mo	0.230 0
Nb	0.033 0
Cu	0.210 0
S	0.000 1
P	0.017 0
Fe	余量

Fig. 1 Dimension and shape of specimen for SSRT

Fig. 2 SRB growth curves under different CP potentials

Fig. 3 EIS of X70 steel in marine environments containing SRB under different CP potentials

Fig. 4 EIS fitted equivalent circuit

Table 2 Fitting data of EIS

CP电位	R_s/ (Ω·cm²)	Q_f/ (Ω^-1·cm^-2·s ⁿ )	R_f/ (Ω·cm²)	Q_dl/ (Ω^-1·cm^-2·s ⁿ )	R_ct/ (Ω·cm²)
OCP	15.88	5.87×10^-4	6.89	1.42×10^-3	4 852.00
-0.775 V	14.50	2.90×10^-2	966.00	6.90×10^-4	2 657.00
-0.850 V	10.02	8.00×10^-4	325.00	3.66×10^-4	11 270.00
-1.000 V	5.66	1.30×10^-7	898.00	5.28×10^-4	529.00

Fig.5 Stress-strain curves and elongation and reduction of area of X70 steel at different CP potentials

Fig.6 SEM of main fracture of X70 steel under different CP potentials

Fig.7 SEM of side fracture of X70 steel under different CP potentials

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