Retarding the Pseudomonas aeruginosa corrosion of aluminum via chloride-assisted biofilm-thickening

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

Corrosion Science Pub Date : 2025-10-14 DOI:10.1016/j.corsci.2025.113416

K. Tang , B. Zhang , G.T. Zhang , Z.C. Hu , X.X. Wei , D.K. Xu , X.L. Ma

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Abstract

Pseudomonas aeruginosa (P. aeruginosa), a marine electroactive microorganism, causes metal corrosion primarily via phenazine-mediated electron transfer, but its synergy with chloride ions is poorly understood. Chloride ions are well known to be aggressive which accelerate corrosion and trigger localized corrosion of metal. They also influence the metabolic behavior of bacteria. Here, we correlated microbial adhesion and metabolic activity with microscopic aluminum corrosion across varying biofilm coverage areas using focused ion beam-scanning electron microscope (FIB-SEM) and aberration-corrected transmission electron microscopy (TEM). Results show the corrosion rate increased nonlinearly as NaCl increased from 0 to 5 g/L. Chloride ions at a specific concentration (1 g/L NaCl) enhanced biofilm formation and triggered P. aeruginosa dormancy. The biofilm acted as a physical barrier, inhibiting corrosion and protecting the aluminum surface. This reveals the critical role of chloride ions in modulating microbial corrosion via biofilm and bacterial activity, providing novel insights into microbiologically influenced corrosion (MIC) mechanisms.

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氯化物辅助生物膜增稠延缓铜绿假单胞菌对铝的腐蚀

铜绿假单胞菌（P. aeruginosa）是一种海洋电活性微生物，主要通过非那嗪介导的电子转移引起金属腐蚀，但其与氯离子的协同作用尚不清楚。众所周知，氯离子具有腐蚀性，会加速腐蚀并引发金属的局部腐蚀。它们还会影响细菌的代谢行为。在这里，我们使用聚焦离子束扫描电子显微镜（FIB-SEM）和像差校正透射电子显微镜（TEM）将微生物粘附和代谢活性与不同生物膜覆盖区域的微观铝腐蚀联系起来。结果表明：NaCl在0 ~ 5 g/L范围内增加，腐蚀速率呈非线性增加；特定浓度的氯离子（1 g/L NaCl）促进了生物膜的形成，触发了铜绿假单胞菌的休眠。生物膜起到物理屏障的作用，抑制腐蚀，保护铝表面。这揭示了氯离子在通过生物膜和细菌活性调节微生物腐蚀中的关键作用，为微生物影响腐蚀（MIC）机制提供了新的见解。

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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.