海洋希瓦氏菌及其介导的钙沉积对 Q235 碳钢腐蚀的影响。
Influence of marine Shewanella putrefaciens and mediated calcium deposition on Q235 carbon steel corrosion.
机构信息
Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China; National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China; BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Innovation School, University of Science and Technology Beijing, Foshan 528399, China.
Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China; National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China.
出版信息
Bioelectrochemistry. 2024 Jun;157:108657. doi: 10.1016/j.bioelechem.2024.108657. Epub 2024 Feb 5.
The microbiologically influenced corrosion inhibition (MICI) of Q235 carbon steel by Shewanella putrefaciens and mediated calcium deposition were investigated by regulating microbial mineralization. In a calcium-rich medium, S. putrefaciens rapidly created a protective calcium carbonate layer on the steel surface, which blocked Cl diffusion. Without calcium, the biofilm and rust layer mitigated pitting corrosion but did not prevent Cl penetration. Potentiodynamic polarization results indicated that the current densities (i values) of the corrosion produced in the S. putrefaciens-inoculated media with and without calcium were 0.4 μA/cm and 0.6 μA/cm, respectively. Similarly, compared with those under sterile conditions, the corrosion inhibition rates were 92.2% and 87.4% higher, respectively. Electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) confirmed that the MICI was caused by the combination of microbial aerobic respiration and the deposited layers. Even under nonbiological conditions, S. putrefaciens-induced calcium carbonate deposition inhibited corrosion.
通过调控微生物矿化作用，研究了腐生脱硫肠球菌对 Q235 碳钢的微生物影响腐蚀抑制（MICI）及其介导的钙沉积作用。在富钙介质中，腐生脱硫肠球菌在钢表面迅速形成保护性碳酸钙层，阻止 Cl 扩散。没有钙时，生物膜和锈层减轻了点蚀腐蚀，但不能阻止 Cl 渗透。动电位极化结果表明，在有无钙的接种介质中产生的腐蚀电流密度（i 值）分别为 0.4 μA/cm 和 0.6 μA/cm。同样，与无菌条件相比，腐蚀抑制率分别提高了 92.2%和 87.4%。电化学阻抗谱（EIS）和扫描电化学显微镜（SECM）证实，MICI 是由微生物需氧呼吸和沉积层的共同作用引起的。即使在非生物条件下，腐生脱硫肠球菌诱导的碳酸钙沉积也能抑制腐蚀。
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