Influence of acidogenic Citrobacter farmeri on the corrosive behaviors of X70 pipeline steel in simulated seawater medium

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science Pub Date : 2025-02-22 DOI:10.1007/s10853-024-10384-2

Jing Ma, Jia-hui Chen, Dan Liu, Zhi-hao Feng, Jian-gang Wang, Jian-hui Li, Xin Zhang, Ming-qiang Fan

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Abstract

This paper studies the corrosion behavior of X70 steel in a simulated seawater environment with the presence of acid-producing bacteria through the analysis of open circuit potentials, linear polarization resistances, electrochemical impedance spectra, biofilm, and pitting morphology. The C. farmeri bacteria attach to the surface of pipeline steel to form a biofilm, which accelerates the corrosion of the steel. In the C. farmeri medium, the corrosion current (i_corr) (5.77 × 10^–6 A cm⁻²) of the steel specimen is approximately 2.2 times higher than that in the sterile solution. The charge transfer resistance (R_ct) of X70 steel in C. farmeri solution remains significantly lower, while corrosion pits are numerous. These pits are concentrated at microbial enrichment sites and coalesce to form larger ones. The oxygen differential concentration cell, caused by the microbial film layer of transparent mucosa, as well as complexation reactions and citric acid produced by C. farmeri, all contribute to accelerating the local corrosion of X70 steel, thereby resulting in a relatively high corrosion rate.

Graphical abstract

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.