取决于流体深度的生物膜特征及其对硫酸盐还原菌诱导的碳钢腐蚀的影响

IF 4.1 2区 环境科学与生态学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Hongshou Huang, Albert Juhasz, Nikki Stanford
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引用次数: 0

摘要

本研究利用脱硫弧菌(Desulfovibrio vulgaris)研究了生物膜特性对流体深度变化的响应及其对低流量流体条件下碳钢(C1020)腐蚀行为的影响。实验在 30 °C 的厌氧室中进行,使用改良巴氏培养基作为测试介质。研究结果表明,流体深度对生物膜-腐蚀产物复合层的形成有重大影响,与较浅的生物膜-腐蚀产物层相比,较深的生物膜-腐蚀产物层更厚、更不均匀,而较浅的生物膜-腐蚀产物层则更薄、更均匀。此外,最初附着的生物膜的特性被证实是影响长期暴露期间后续腐蚀行为的主要因素。腐蚀分析表明,流体深度越大,重量损失越大(91 ± 13.2 mg/cm2),凹坑深度越深(540 ± 69 μm),超过了暴露 28 天后在较浅测试介质中观察到的结果(21 ± 2.3 mg/cm2 和 105 ± 17 μm)。生物膜内的腐蚀产物主要是 FeS 和 Fe3(PO4)2-8H2O。生物膜-腐蚀产物层的厚度与凹坑深度的进展之间存在直接关系,这表明在有限的流体深度(如 5-15 毫米)内,碳钢腐蚀与生物膜发展之间存在密切联系。此外,最深的凹坑(平均值)与生物膜内的无柄细胞数量之间存在明显的关联,这突出表明了无柄细胞数量在碳钢腐蚀中的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fluid depth-dependent biofilm characteristics and their influence on sulfate-reducing bacteria-induced corrosion of carbon steel

This study investigates the response of biofilm characteristics to variations in fluid depth and their influence on the corrosion behavior of carbon steel (C1020) under low-flow fluid conditions, utilizing Desulfovibrio vulgaris. The experiments were conducted in an anaerobic chamber at 30 °C, utilizing modified Baar's medium as the testing medium. The findings reveal that fluid depth significantly impacts biofilm-corrosion product composite formation, with deeper depths promoting thicker and more heterogeneous biofilm-corrosion product layer compared to shallower depths, where a thinner and more uniform biofilm-corrosion product layer is observed. Moreover, the characteristics of initially attached biofilms was verified as the primary factor affecting subsequent corrosion behavior during prolonged exposure. Corrosion analysis reveals that greater fluid depth leads to increased weight loss (91 ± 13.2 mg/cm2) and deeper pit depths (540 ± 69 μm), surpassing those observed in shallower test media (21 ± 2.3 mg/cm2 and 105 ± 17 μm) after 28 days of exposure. The corrosion products within the biofilm were predominantly FeS and Fe3(PO4)2·8H2O. A direct relationship was observed between the thickness of this biofilm-corrosion product layer and the progression of pit depth, suggesting a strong correlation between carbon steel corrosion and biofilm development in limited fluid depths (e.g., 5–15 mm). Furthermore, a significant association between the deepest pits (average) and the number of sessile cells within the biofilm underscores the pivotal role of sessile cell numbers in carbon steel corrosion.

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来源期刊
CiteScore
9.60
自引率
10.40%
发文量
107
审稿时长
21 days
期刊介绍: International Biodeterioration and Biodegradation publishes original research papers and reviews on the biological causes of deterioration or degradation.
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