1.Introduction Microbiologically influenced corrosion(MIC)is the destruction of metal materials caused by the activity of microorganisms and the participation of biofilms[1].Global economic costs caused by marine corr...1.Introduction Microbiologically influenced corrosion(MIC)is the destruction of metal materials caused by the activity of microorganisms and the participation of biofilms[1].Global economic costs caused by marine corrosion come to hundreds of billion dollars per year,with approximately 20% of corrosion losses caused by MIC[2].The MIC poses a serious threat to the integrity and safety of assets in the oil and gas industry,water industry,and nuclear waste storage facili-ties[3-5].展开更多
The impact of Bacillus subtilis(B.subtilis)on the corrosion behavior(microbiologically influenced corrosion)of two aluminum alloys—7075 aluminum alloy(AA7075)and 2024 aluminum alloy(AA2024)—is investigated in a high...The impact of Bacillus subtilis(B.subtilis)on the corrosion behavior(microbiologically influenced corrosion)of two aluminum alloys—7075 aluminum alloy(AA7075)and 2024 aluminum alloy(AA2024)—is investigated in a high-salinity environment.The corrosion mechanism is explored by observing the bacterial growth process and the corresponding measurements.The assessment involves the analysis of surface morphology,corrosion mass loss,and electrochemical tests.Surface morphology reveals the development of B.subtilis and biofilm formation on the surface of the aluminum alloys.Both mass loss and electrochemical tests illustrate the corrosion inhibition effect of B.subtilis on aluminum alloys in a high-salt environment.AA7075 alloy was more affected by the biofilm and had a more pronounced corrosion inhibition effect.After 10 d of testing,in B.subtilis group,AA7075 and AA2024 bode values were elevated by 0.32×10^(4) and 0.24×10^(4)Ω,respectively.The open circuit potential of AA2024 decreased by−0.107 A/cm^(2) under the influence of bacteria,and the dynamic potentiodynamic polarization curve shifted significantly to the left.展开更多
With the rapid development of the marine economy,marine microbiologically influenced corrosion(MIC)has garnered increasing attention.However,most studies have not analyzed the MIC process over continuous and extended ...With the rapid development of the marine economy,marine microbiologically influenced corrosion(MIC)has garnered increasing attention.However,most studies have not analyzed the MIC process over continuous and extended periods,failing to provide a comprehensive understanding of MIC mechanisms at different stages.In this study,the corrosion behavior of EH36 steel caused by Halomonas titanicae in an aerobic enriched seawater over a 30-d incubation period was investigated driven by big data.The results revealed that the corrosion by H.titanicae against EH36 steel evolved dynamically over time.During the initial stages,the aerobic respiration of H.titanicae consumed significant amounts of oxygen,which suppressed the cathodic oxygen reduction process,thereby inhibiting corrosion compared to the abiotic conditions.As time progressed,the accumulation of corrosion products slowed the abiotic corrosion,while the biotic corrosion accelerated due to a shift from aerobic to anaerobic respiration by H.titanicae,utilizing Fe0 and nitrate as electron donors and acceptors,respectively.The big data results are consistent with the weight loss and electrochemical data,demonstrating the reliability of using big data monitoring techniques to characterize microbial corrosion processes.展开更多
基金supported by the National Natural Science Foun-dation of China(Nos.52371071,51971228,and 51771212).
文摘1.Introduction Microbiologically influenced corrosion(MIC)is the destruction of metal materials caused by the activity of microorganisms and the participation of biofilms[1].Global economic costs caused by marine corrosion come to hundreds of billion dollars per year,with approximately 20% of corrosion losses caused by MIC[2].The MIC poses a serious threat to the integrity and safety of assets in the oil and gas industry,water industry,and nuclear waste storage facili-ties[3-5].
基金supported by the National Natural Science Foundation of China(No.52073311)Guangdong Basic and Applied Basic Research Foundation(No.2021A1515012281)+1 种基金Guangdong-Hong Kong-Macao Joint Innovation Field Research Foundation(No.2023A0505010011)Zhuhai Industry University Research Cooperation Project(No.ZH22017001210148PWC).
文摘The impact of Bacillus subtilis(B.subtilis)on the corrosion behavior(microbiologically influenced corrosion)of two aluminum alloys—7075 aluminum alloy(AA7075)and 2024 aluminum alloy(AA2024)—is investigated in a high-salinity environment.The corrosion mechanism is explored by observing the bacterial growth process and the corresponding measurements.The assessment involves the analysis of surface morphology,corrosion mass loss,and electrochemical tests.Surface morphology reveals the development of B.subtilis and biofilm formation on the surface of the aluminum alloys.Both mass loss and electrochemical tests illustrate the corrosion inhibition effect of B.subtilis on aluminum alloys in a high-salt environment.AA7075 alloy was more affected by the biofilm and had a more pronounced corrosion inhibition effect.After 10 d of testing,in B.subtilis group,AA7075 and AA2024 bode values were elevated by 0.32×10^(4) and 0.24×10^(4)Ω,respectively.The open circuit potential of AA2024 decreased by−0.107 A/cm^(2) under the influence of bacteria,and the dynamic potentiodynamic polarization curve shifted significantly to the left.
基金financially supported by the National Natural Science Foundation of China(Nos.U2106206,52471079,42276212,and 42176043)the Natural Science Foundation of Shandong Province(ZR2024ME047)+1 种基金the National Materials Corrosion and Protection Data Center(No.2023DATAFU20-01)The authors wish to acknowledge Sen Wang,Haiyan Yu,Xiaomin Zhao from State Key Laboratory of Microbial Technology,Shandong University for the assistance in the SEM analysis。
文摘With the rapid development of the marine economy,marine microbiologically influenced corrosion(MIC)has garnered increasing attention.However,most studies have not analyzed the MIC process over continuous and extended periods,failing to provide a comprehensive understanding of MIC mechanisms at different stages.In this study,the corrosion behavior of EH36 steel caused by Halomonas titanicae in an aerobic enriched seawater over a 30-d incubation period was investigated driven by big data.The results revealed that the corrosion by H.titanicae against EH36 steel evolved dynamically over time.During the initial stages,the aerobic respiration of H.titanicae consumed significant amounts of oxygen,which suppressed the cathodic oxygen reduction process,thereby inhibiting corrosion compared to the abiotic conditions.As time progressed,the accumulation of corrosion products slowed the abiotic corrosion,while the biotic corrosion accelerated due to a shift from aerobic to anaerobic respiration by H.titanicae,utilizing Fe0 and nitrate as electron donors and acceptors,respectively.The big data results are consistent with the weight loss and electrochemical data,demonstrating the reliability of using big data monitoring techniques to characterize microbial corrosion processes.
