EH36钢中Mo对SRB附着和腐蚀的影响及机理

doi:10.11902/1005.4537.2024.389

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1341-1350 CSTR: 32134.14.1005.4537.2024.389 DOI: 10.11902/1005.4537.2024.389

研究报告

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EH36钢中Mo对SRB附着和腐蚀的影响及机理

郭章伟, 叶婷雨, 郭娜, 刘涛(

)

上海海事大学海洋科学与工程学院上海 201306

Effect of Mo Addition on Corrosion Behavior of EH36 Steel in Seawater Included With Sulfate Reduction Bacteria

GUO Zhangwei, YE Tingyu, GUO Na, LIU Tao(

)

Shanghai Maritime University, College of Ocean Science and Engineering, Shanghai 201306, China

引用本文:

郭章伟, 叶婷雨, 郭娜, 刘涛. EH36钢中Mo对SRB附着和腐蚀的影响及机理[J]. 中国腐蚀与防护学报, 2025, 45(5): 1341-1350.
Zhangwei GUO, Tingyu YE, Na GUO, Tao LIU. Effect of Mo Addition on Corrosion Behavior of EH36 Steel in Seawater Included With Sulfate Reduction Bacteria[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1341-1350.

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摘要:

海洋工程材料的成分设计过程往往会忽略微生物的影响，但合金元素的组成可以对微生物附着和腐蚀造成很大地影响。研究表明，EH36船用钢中添加Mo加速了在海洋中常见的厌氧微生物硫酸盐还原菌(SRB)对材料的腐蚀。截面扫描电镜结果显示，相较于不含Mo的钢材，含Mo钢腐蚀产物层厚度由13 μm提高到20 μm；更多的点蚀出现在含钼钢表面，同时含Mo钢腐蚀速率比不含Mo钢提高了约40%。相关转录组分子机制指出，Mo可以增加SRB生物膜中附着和硫酸盐还原过程相关基因的表达。更致密的生物膜和硫化氢产物生成加速了材料腐蚀。因此，在微生物环境下设计材料时，应充分考虑微生物因素。

关键词 ：微生物腐蚀, 硫酸盐还原菌, Mo, 分子机制, 转录组

Abstract：

In the design stage of marine engineering materials, it is easy to ignore the influence of microorganisms when the engineering facilities are in actual service. In fact, the alloying elements of the materials have a great impact on the adhesion of microorganisms and the corrosion performance of the materials. Herein, the effect of Mo addition on the corrosion behavior of EH36 marine steel in aged seawater included with sulfate reducing bacteria (SRB) is assessed via electrochemical measurement, optical microscope, scanning electron microscope and X-ray diffractometer etc. The results show that the introduction of Mo can accelerate the SRB induced corrosion of the EH36 steel, namely the thickness of the corrosion product scale of the Mo containing steel is 20 μm, while that of the steel without Mo is 13 μm, the corrosion increment of the former is as high as 40%; More pitting corrosion occurs on the surface of Mo containing steel. The relevant molecular mechanisms indicated that molybdenum could increase the expression of genes related to the adhesion and sulfate reduction processes in SRB biofilms. A denser biofilm and more hydrogen sulfide production accelerated material corrosion. Therefore, when designing materials in microbial environments, microbial factors should be fully considered.

Key words： MIC sulfate reducing bacteria molybdenum molecular mechanisms RNA-seq

收稿日期: 2024-11-29 32134.14.1005.4537.2024.389

ZTFLH:

TG172

基金资助:国家自然科学基金(51901127);国家自然科学基金(41976039);国家自然科学基金(42006039)

通讯作者: 刘涛，E-mail：liutao@shmtu.edu.cn，研究方向为材料表面腐蚀与防护、材料失效

Corresponding author: LIU Tao, E-mail: liutao@shmtu.edu.cn

作者简介: 郭章伟，男，1989年生，博士，副教授

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表1 对照钢(Cs)和含钼钢(Ms)的化学成分

图1 荧光显微镜下细菌在Cs和Ms表面附着情况

图2 Cs和Ms在无菌培养基中浸泡14 d后表面SEM图像

图3 Cs和Ms在有菌培养基中浸泡14 d后表面的SEM图像

图4 Cs和Ms 在有菌培养基中浸泡14 d后的SEM横截面图

图5 Cs和Ms在含D.vulgaris的培养基中浸泡14 d后的XRD谱图

图6 Cs和Ms在有菌培养基中浸泡14 d后的EDS结果

图7 Cs和Ms在无菌培养基中浸泡14 d后点蚀的二维和三维图像

图8 Cs和Ms在有菌培养基中浸泡14 d后点蚀的二维和三维图像

图9 Cs和Ms在无菌和有菌培养基中浸泡10 d后表面点蚀统计

图10 Ms和Cs在无菌和有菌培养基中的腐蚀速率

图11 Ms和Cs在无菌和有菌培养基中的Nyquist图和相应等效电路图

表2 Cs和Ms在无菌培养基中浸泡不同时间后的EIS的拟合参数

表3 Cs和Ms在有菌培养基中浸泡不同时间后的EIS拟合参数

图12 Mo影响D.vulgaris在合金钢表面的附着和腐蚀的分子控制机理图

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