Microbiologically influenced corrosion(MIC)of steel generates a corrosion product film,which can also be called biomineralization film.It is critical to understand the structure of biomineralization film since it dominates the corrosion behavior of metal.In this work,Pseudomonas stutzeri(P.stutzeri)was iso-lated from seawater,and the biomineralization film caused by marine P.stutzeri was characterized by Transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray diffraction(XRD),etc.The mechanistic effects of the biomineralization film on X80 pipeline steel corrosion were also inves-tigated.The results indicate that the minerals are mainly composed of nano Fe3O4 and FeOOH,according to TEM and XRD results.The particle sizes of biominerals are below 10 nm.This work also provides an insight strategy to prepare nanomaterials by MIC caused by P.stutzeri.In addition,P.stutzeri can grow well with CO2 as a carbon source and iron as an electron donor.The corrosion rates(CRs)of specimens are closely related to the structure of biomineralization film.The CRs increase with the decrease of ini-tial cell concentration.P.stutzeri with an initial concentration of 107 cells/mL can promote the formation of a compact biomineralization film with a thickness of 145.8±4.8 μm,leading to corrosion inhibi-tion with a CR of 0.058±0.008 mm/y.But some corrosion pits can be observed due to the formation of small anodes.Electrochemical impedance spectroscopy(EIS)data show higher impedance values and two time-constants,which imply the formation of a compact biomineralization film.

Haixian Liu;Wen Chen;Yu Tan;Guozhe Meng;Hongfang Liu;YFrank Cheng;Hongwei Liu

School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;Research Institute of Natural Gas Technology,Southwest Oil&Gasfield Company,China National Petroleum Corporation,Chengdu 610000,China;Key Laboratory for Large-Format Battery Materials and System,Ministry of Education,Hubei Key Laboratory of Materials Chemistry and Service Failure,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Department of Mechanical and Manufacturing Engineering,University of Calgary,Calgary,Alberta T2N 1N4,Canada

材料科学技术（英文版）

[1]Haixian Liu;Wen Chen;Yu Tan;Guozhe Meng;Hongfang Liu;YFrank Cheng;Hongwei Liu-.Characterizations of the biomineralization film caused by marine Pseudomonas stutzeri and its mechanistic effects on X80 pipeline steel corrosion)[J].材料科学技术（英文版）,2022(30):15-28

biominerals

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