<strong>AH36</strong>船体钢在硫酸盐还原菌环境下的腐蚀机制研究

doi:10.11902/1005.4537.2025.187

中国腐蚀与防护学报

2026, Vol. 46

Issue (3): 833-844 CSTR: 32134.14.1005.4537.2025.187 DOI: 10.11902/1005.4537.2025.187

研究报告

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AH36船体钢在硫酸盐还原菌环境下的腐蚀机制研究

付磊¹^,², 张千¹, 林莉³(

), 蹇科¹, 王雅君⁴, 程飞⁴, 彭东梅⁴, 刘明¹

^1.四川轻化工大学机械工程学院宜宾 644000
^2.四川大学灾变力学与工程防灾四川省重点实验室成都 610065
^3.四川轻化工大学材料科学与工程学院自贡 643000
^4.四川省宇环气象电子工程科技有限公司成都 610044

Corrosion Mechanism of AH36 Hull Steel in Sulfate-reducing Bacteria Environment

FU Lei¹^,², ZHANG Qian¹, LIN Li³(

), JIAN Ke¹, WANG Yajun⁴, CHENG Fei⁴, PENG Dongmei⁴, LIU Ming¹

^1.Sichuan University of Science and Engineering, School of Mechanical Engineering, Yibin 644000, China
^2.Sichuan University, Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province, Chengdu 610065, China
^3.Sichuan University of Science and Engineering, School of Materials Science and Engineering, Zigong 643000, China
^4.Sichuan Yuhuan Meteorological Electronic Engineering Technology Co. Ltd., Chengdu 610044, China

引用本文:

付磊, 张千, 林莉, 蹇科, 王雅君, 程飞, 彭东梅, 刘明. AH36船体钢在硫酸盐还原菌环境下的腐蚀机制研究[J]. 中国腐蚀与防护学报, 2026, 46(3): 833-844.
Lei FU, Qian ZHANG, Li LIN, Ke JIAN, Yajun WANG, Fei CHENG, Dongmei PENG, Ming LIU. Corrosion Mechanism of AH36 Hull Steel in Sulfate-reducing Bacteria Environment[J]. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 833-844.

全文: PDF(18981 KB) HTML

摘要:

海洋环境含有丰富的C源、N源及维生素等营养物质，促进微生物在船体钢材表面附着形成生物膜并诱发微生物腐蚀，加速构件的腐蚀失效。为探明海洋典型细菌—硫酸盐还原菌(SRB)对AH36船体钢腐蚀行为的影响，本研究通过腐蚀失重计算、微观形貌分析及电化学测试等技术手段系统研究了AH36船体钢的腐蚀行为及腐蚀机制。结果表明，SRB作用下30 d的腐蚀失重速率约为无菌体系的5倍左右，试样表面生成了FeS并伴有显著的局部腐蚀坑。电化学测试结果显示，SRB体系低频阻抗模值和极化电阻值显著降低，腐蚀电流密度为5.01 × 10^-5 A·cm^-2，约为无菌体系的10倍。研究表明，SRB通过生物阴极催化硫酸盐还原、促进阴极去极化及在生物膜下形成的浓差电池，显著加速了阳极的溶解，这都揭示了其在海洋腐蚀过程中的关键作用。

关键词 ： AH36船体钢, 硫酸盐还原菌（SRB）, 生物膜, 腐蚀失重, 电化学测试

Abstract：

Marine environments are rich in carbon-source, nitrogen-source, and vitamins, which promote microbial adhesion and biofilm formation on ship hull steel surfaces, thereby accelerating microbiologically influenced corrosion (MIC). Herein, the corrosion behavior of AH36 high-strength hull steel induced by sulfate-reducing bacteria (SRB), a typical marine bacterium, was systematically investigated by means of mass loss measurements, microscopic morphology analysis, and electrochemical testing. The results show that after 30 d of exposure, the corrosion rate in the SRB-inoculated solution was approximately five times higher than that in the sterile control ones, with FeS deposits observed on the steel surface and evident localized corrosion pits. Electrochemical tests revealed significantly lower low-frequency impedance and polarization resistance values in the SRB containing solution, and a corrosion current density of 5.01 × 10^-5 A·cm^-2, which is about ten times that of the sterile solution. These findings indicate that SRB accelerate the anodic dissolution of the steel by catalyzing sulfate reduction through bio-cathodic activity and promoting the formation of concentration cells under biofilms, thus playing a critical role in the corrosion process in marine environments.

Key words： AH36 hull steel sulfate-reducing bacteria (SRB) biofilm corrosion mass loss electrochemical testing

收稿日期: 2025-06-18 32134.14.1005.4537.2025.187

ZTFLH:

TB304

基金资助:灾变力学与工程防灾减灾四川省重点实验室(四川大学)开放课题基金(FMEDP202109);四川省区域创新合作项目(2024YFHZ0073);自贡市-四川大学校地合作专项(2024CDZG-1);四川轻化工大学科研创新团队计划(SUSE652A015)

通讯作者: 林莉，E-mail：linli1031@126.com，研究方向为微生物腐蚀

Corresponding author: LIN Li, E-mail: linli1031@126.com

作者简介: 付磊，男，1977年生，博士，教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.187 或 https://www.jcscp.org/CN/Y2026/V46/I3/833

图1 SRB培养过程中培养基外观及细胞形貌变化

图2 SRB在15 d内的生长代谢变化

图3 AH36船体钢在无菌和SRB溶液中的腐蚀速率

表1 NACE SP 0775-2018 SG腐蚀速率评价要求[18]

图4 AH36船体钢在无菌和SRB溶液中腐蚀10和30 d后的表面腐蚀产物形貌

图5 AH36船体钢试样表面腐蚀产物的EDS扫描结果

表2 AH36船体钢试样表面腐蚀产物主要元素选区分析结果

图6 AH36船体钢在无菌与SRB溶液中形成的腐蚀产物XRD图谱

Reaction type	Reaction process
Anode reaction	$F e → F e 2 + + 2 e -$
Ionization of water	$H 2 O → H + + O H -$
Cathode reaction	$H + + e - → H$
Cathodic depolarization reaction	$S O 4 2 - + 8 H → S 2 - + 4 H 2 O$
	$F e 2 + + 2 O H - → F e O H 2$
Corrosion product generation reaction	$8 F e O H 2 + 2 H 2 O + O 2 → 4 F e O H 3 + F e 2 O 3 ⋅ n H 2 O$
	$F e 2 + + S 2 - → F e S$
	$F e S + S 2 - → F e S 2 + 2 e -$

表3 AH36钢在SRB溶液中的腐蚀反应

图7 两种体系下不同腐蚀时间AH36钢基体表面形貌

图8 AH36船体钢在无菌与SRB溶液中OCP变化

图9 AH36船体钢在无菌与SRB溶液中的EIS图谱

图10 电化学等效电路模型

表4 两种体系等效电路元件拟合参数

图11 AH36船体钢在无菌和SRB溶液中的极化电阻

图12 AH36船体钢在无菌与SRB溶液中腐蚀15 d后的极化曲线

表5 AH36船体钢在无菌与SRB溶液中的极化曲线拟合结果

图13 AH36船体钢在SRB环境下的腐蚀过程示意图

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