Synergistic acceleration of galvanic corrosion by selective D. vulgaris colonization on the heat-affected zone of steel welds

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-12 DOI:10.1016/j.corsci.2025.113316

Yunlong Bai , Jin Xu , Kaihui Dong , Guanlun Guo , Feng Tian , Boxin Wei , Changkun Yu , Cheng Sun

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Abstract

The study reveals that D. vulgaris (sulfate-reducing bacteria, SRB) selectively accelerate galvanic corrosion in the heat-affected zone (HAZ) of X80 steel under thin liquid films, using electrochemical tests, scanning vibrating electrode technology (SVET), ultraviolet photoelectron spectroscopy (UPS), and finite element simulation (FES). UPS confirmed that the HAZ exhibits a lower work function, which not only enhances its anodic activity but also promotes the adsorption of D. vulgaris. Furthermore, galvanic coupling between the HAZ and other regions intensifies this selective bacterial colonization. The concentrated metabolic activities of the adsorbed D. vulgaris further amplify the driving force for galvanic corrosion. Collectively, these synergistic effects result in a significantly increased anodic current density of 14.38 μA·cm⁻² in the HAZ, which is 3.94 times higher than the control group, thereby enhancing the susceptibility to localized corrosion.

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钢焊缝热影响区中普通弧菌选择性定植对电偶腐蚀的协同加速作用

采用电化学测试、扫描振动电极技术（SVET）、紫外光电子能谱（UPS）和有限元模拟（FES）等方法，研究了硫酸还原菌（SRB）在液体薄膜下选择性加速X80钢热影响区（HAZ）的电偶腐蚀。UPS证实，HAZ具有较低的功函数，这不仅增强了HAZ的阳极活性，还促进了其对寻常草的吸附。此外，热影响区和其他区域之间的电偶联加强了这种选择性细菌定植。被吸附的赤霉病菌的集中代谢活动进一步放大了电偶腐蚀的驱动力。综上所述，这些协同效应导致HAZ内阳极电流密度显著增加，达到14.38 μA·cm−2，是对照组的3.94倍，从而增强了局部腐蚀的敏感性。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.