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Exopolysaccharide produced by Vibrio neocaledonicus sp. as a green corrosion inhibitor:Production and structural characterization

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Journal of Materials Science & Technology 2018年第12期34卷 2447-2457页

作者： masoumeh moradi Zhenlun Song Tao Xiao Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of Sciences College of Materials Science and Engineering Taiyuan University of Technology

An exopolysaccharide substances produced by Vibrio neocaledonicus sp. was introduced as a novel green inhibitor against the corrosion of carbon steel in artificial seawater and acidic media. The produced extracellular polymeric substance（EPS） is heterogeneous with composition of polysaccharides, nucleic acids and protein and average molecular weight of 29,572 Da. Adsorption of EPS on the metal surfaces and formation of Fe-EPS complexes acted as a barrier to prevent the oxygen penetration and hindered anodic and cathodic reactions. The inhibitory effect increases with increasing EPS concentration and exposure time. The highest corrosion inhibitory effect（95.1%） was observed for 10 g/L of EPS after 5 days of exposure in seawater. This is the highest inhibitory effect ever been reported by EPSs. While, the optimum concentration of EPS with the highest inhibition efficiency in 1 N H;SO;was 1000 ppm. The influence of different parameters, such as initial pH, growth phase, various nitrogen and carbon sources on the production of EPS and its corrosion inhibitory effect were also investigated. According to results,the optimum culture medium for EPS production is contained artificial seawater including 5% mannitol as carbon source and 0.1%（NH;）;SO;as nitrogen source at pH = 8. This medium could produce 22.24 g/L EPS during 3 days’ incubation at 30 ℃. The corrosion inhibitory efficiency of obtained EPS was 95.97%.

关键词： Extracellular polymeric substances Vibrio neocaledonicus sp. Green corrosion inhibitor Chemical analysis

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Inhibitory Effect of Vibrio neocaledinocus sp. and Pseudoalteromonas piscicida Dual-Species Biofilms on the Corrosion of Carbon Steel

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 551-562页

作者： masoumeh moradi Jianlin Li Wenhui Liu Dake Xu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotrotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

Multi-species biofilms are found in various bacterial habitats and have industrial relevance. These complex bacterial communities have synergetic effects, unlike a single species. Therefore, it is critical to evaluate these complex communities as a whole. Here, the inhibitory eff ect of single-and dual-species biofilms of Vibrio neocaledinocus sp. and Pseudoalteromonas piscicida for A36 carbon steel corrosion was investigated. The results demonstrated that the synergistic interactions of the monoculture increased the overall biomass production of the dual-species biofilm, but the growth rate was reduced in the presence of the dual-species culture due to a lack of nutrients. Field emission scanning electron microscopy images also confirmed the development of biofilms—they became more homogenized via exposure time in both the mono-and dual-species cultures. The corrosion resistance of A36 carbon steel positively increased because of the dual-species interactions. This reached the highest value after four weeks of exposure. The highest corrosion inhibition e fficiency of 99.8% was achieved in the dual-species cultures. Microbial community analysis revealed the high relative abundance of Pseudoalteromonas piscicida during the initial days of exposure, demonstrating the dominant role of this bacterium in the biofilm structure.

关键词： Dual-species biofilm Steel alloys Corrosion inhibitory Electrochemical analysis Cooperative interaction

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Influence of Static Low Electromagnetic Field on Copper Corrosion in the Presence of Multispecies Aerobic Bacteria

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Acta Metallurgica Sinica(English Letters) 2019年第10期32卷 1287-1297页

作者： Xiao-Yang Wei masoumeh moradi Li-Jing Yang Zhen-Lun Song Bi-Zhang Zheng Zhan-Peng Lu Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Materials Science and Engineering Shanghai University Shanghai 200072 China Corrosion and Protection Division Shenyang National Laboratory for Materials Science Northeastern University Shenyang 110819 China

The effects of low electromagnetic field (EMF)(B = 2 mT) on the corrosion of pure copper in the absence and presence of multispecies marine aerobic bacteria were investigated in this work. The results showed that EMF has an inhibitory effect on copper metals and decreases the corrosion rate of copper metals in sterile artificial seawater. However, microbiologically influenced corrosion of Cu was increased in the presence of electromagnetic field due to its effect on the biofilm morphology and structure. EMF reduced the growth rate of bacteria and decreased bacterial attachment, thereby forming a heterogeneous and non-stable biofilm on the Cu surface in the presence of EMF. Moreover, the biofilm was dispersed throughout the surface after 7 days, whereas the scattered bacteria were observed on the surface after 10 days. Confocal laser scanning microscopy images showed large and deep pits on the surface in the presence of EMF and confirmed the acceleration of Cu corrosion in the presence of EMF and multispecies bacteria. Furthermore, XPS and FTIR results demonstrated that the corrosion products and metabolic by-products were significantly changed in the presence of EMF.

关键词： Electromagnetic field Multispecies aerobic bacteria Corrosion Biofilm

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Methanogenic archaea and sulfate reducing bacteria induce severe corrosion of steel pipelines after hydrostatic testing

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Journal of Materials Science & Technology 2020年第13期47卷 72-83页

作者： Enze Zhou Jianjun Wang masoumeh moradi Huabing Li Dake Xu Yuntian Lou Jinheng Luo Lifeng Li Yulei Wang Zhenguo Yang Fuhui Wang Jessica A.Smith Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotrotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China CNPC Tubular Goods Research Institute Xian 710065China CNPC Pipeline Construction Administration Department Beijing 100101China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Department of Biomolecular Sciences Central Connecticut State UniversityNew BritainCT 06050USA

Complex interactions within a microbial consortium can induce severe corrosion in oil *** study investigated the mechanism of microbiologically influenced corrosion(MIC)that led to failure of X52 steel pipelines after hydrostatic *** hydrostatic testing with untreated lake water and underground water were used to simulate and study the events that led to the actual *** analysis,weight loss,and several electrochemical measurements demonstrated rapid corrosion rates after hydrostatic *** of microbial community structures revealed that methanogenic archaea and sulfate reducing bacteria(SRB),introduced by the hydrotest water,formed corrosive biofilms on X52 steel coupon surfaces that induced severe pitting.

关键词： Pipeline steel Microbiologically influenced corrosion Sulfate-reducing bacteria(SRB) Pitting corrosion

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S32750超级双相不锈钢在NaCl溶液中的临界点蚀温度及电化学腐蚀机理

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中国腐蚀与防护学报 2015年第2期35卷 106-112页

作者：何进晏敏胜杨丽景 masoumeh moradi 宋振纶蒋业华昆明理工大学材料科学与工程学院昆明650093 中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波315201

采用电化学测试研究了S32750超级双相不锈钢在3.5%Na Cl溶液中的临界点蚀温度(CPT)及电化学腐蚀机理,结合试样点蚀前后的形貌变化,得出S32750不锈钢的临界点蚀温度为71℃。在低于临界点蚀温度时,不锈钢表面能形成稳定的钝化膜;高于临界... 详细信息

采用电化学测试研究了S32750超级双相不锈钢在3.5%Na Cl溶液中的临界点蚀温度(CPT)及电化学腐蚀机理,结合试样点蚀前后的形貌变化,得出S32750不锈钢的临界点蚀温度为71℃。在低于临界点蚀温度时,不锈钢表面能形成稳定的钝化膜;高于临界点蚀温度时,由于Cl-的活性增加及钝化膜的溶解,不锈钢表面产生点蚀现象,且温度越高,点蚀越剧烈。构建了双相不锈钢S32750临界点蚀温度前后的电化学腐蚀模型。

关键词：双相不锈钢临界点蚀温度钝化腐蚀

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新喀里多尼亚弧菌胞外聚合物对硫酸中Q235碳钢的缓蚀作用

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中国腐蚀与防护学报 2016年第2期36卷 150-156页

作者：肖涛 masoumeh moradi 宋振纶杨丽景闫涛侯利锋太原理工大学材料科学与工程学院太原030024 中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波315201

采用电化学阻抗测试、极化曲线测试和扫描电镜观察等方法研究了在25℃条件下新喀里多尼亚弧菌胞外聚合物(EPS)对Q235碳钢在0.5 mol/L H2SO4溶液中的缓蚀作用。结果表明:该弧菌EPS能够在碳钢表面形成一层较为致密的Fe-EPS保护层,可有效抑... 详细信息

采用电化学阻抗测试、极化曲线测试和扫描电镜观察等方法研究了在25℃条件下新喀里多尼亚弧菌胞外聚合物(EPS)对Q235碳钢在0.5 mol/L H2SO4溶液中的缓蚀作用。结果表明:该弧菌EPS能够在碳钢表面形成一层较为致密的Fe-EPS保护层,可有效抑制H_2SO_4溶液对Q235钢的腐蚀。随着EPS浓度的增加,缓蚀效率增大;当EPS浓度为1.0 g/L时,缓蚀效率最高。EPS在Q235钢表面的吸附为自主的化学吸附且符合Langmuir吸附模型。通过Fourier红外吸收光谱确定了该EPS的成分。

关键词： Q235碳钢弧菌胞外聚合物缓蚀化学吸附

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The effect of bacterial interspecies interaction on induction or inhibition of metals corrosion

The effect of bacterial interspecies interaction on inductio...

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第十一届全国腐蚀与防护大会

作者： moradi masoumeh Xu Dake Wang Fuhui Shenyang National Laboratory for Materials Science Northeastern University

Investigations of multispecies biofilms and the relationships among the bacterial species are crucial for understanding the microbiologically influenced corrosion of metal alloys in actual *** interact with each other in a variety of ways. Their interactions may be positive, such as neutralism, commensalism, and mutualism, or negative, such as parasitism, predation, or competition. The most common interaction is competition, when one bacterium prevents its neighbor from accessing the nutrients. However, many bacteria regulate cooperative activities as a mutually beneficial way to benefit from each other. They release, sense, and respond to diffusible signal molecules to interact *** study aims to investigate the interspecies interaction between two corrosive bacteria, namely Vibrio azureus and Jeotgalibacillus alkaliphilus and two inhibitory bacteria, Vibrio neocaledinocus sp. and Pseudoalteromonas piscicida. All bacteria were isolated from East China Sea. Various electrochemical,spectroscopic, and microscopic techniques were performed to understand the biofilm structure and corrosion behavior of steel alloys in the presence of pure cultures and a mixture of the two species.

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新喀里多尼亚弧菌对Cu在人工海水中腐蚀行为的影响

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中国腐蚀与防护学报 2016年第2期36卷 157-164页

作者：闫涛宋振纶 masoumeh moradi 杨丽景肖涛侯利锋太原理工大学材料科学与工程学院太原030024 中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波315201

分离出了一种具有高度缓蚀作用的新喀里多尼亚弧菌,通过电化学测量方法和表面分析技术研究了该细菌对Cu在人工海水中腐蚀行为的影响。结果表明,新喀里多尼亚弧菌使Cu的开路电位明显负移;在有菌介质中,Cu表面的阻抗值显著增大;同时腐蚀... 详细信息

分离出了一种具有高度缓蚀作用的新喀里多尼亚弧菌,通过电化学测量方法和表面分析技术研究了该细菌对Cu在人工海水中腐蚀行为的影响。结果表明,新喀里多尼亚弧菌使Cu的开路电位明显负移;在有菌介质中,Cu表面的阻抗值显著增大;同时腐蚀电流密度明显降低,说明该细菌可以抑制Cu在人工海水中的腐蚀。CLSM结果显示,Cu表面吸附有大量的细菌,而SEM观察到Cu表面生物膜并不多,说明这种抑制作用是由吸附在Cu表面的细菌引起的,而与Cu表面的生物膜关系不大。

关键词： Cu 新喀里多尼亚弧菌细菌吸附缓蚀作用

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杀鱼假交替单胞菌对模拟海水流动环境下Q235碳钢腐蚀的抑制行为

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中国腐蚀与防护学报 2018年第2期38卷 174-182页

作者：叶赛 masoumeh moradi 宋振纶胡方勤孙朝晖龙剑平成都理工大学材料与化学化工学院成都610059 中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波315201

从位于中国东海的钢铁研究总院舟山海洋腐蚀研究所近海海域的海底沉积物中分离提取得到杀鱼假交替单胞菌,分别将其接种到细菌培养广口瓶和模拟海水流动环境培养器中,利用电化学工作站、扫描电镜及红外光谱仪对浸泡于两种培养体系中Q235... 详细信息

从位于中国东海的钢铁研究总院舟山海洋腐蚀研究所近海海域的海底沉积物中分离提取得到杀鱼假交替单胞菌,分别将其接种到细菌培养广口瓶和模拟海水流动环境培养器中,利用电化学工作站、扫描电镜及红外光谱仪对浸泡于两种培养体系中Q235碳钢样品的腐蚀行为进行研究。结果表明,杀鱼假交替单胞菌能抑制碳钢在海水中的腐蚀进程。样品的阻抗在广口瓶培养体系中得到了更为明显的提高,广口瓶培养体系中的碳钢样品表面覆盖着一层质地均匀且完整的生物膜;而模拟海水流动环境中碳钢样品表面的生物膜厚度不均匀,海水通过膜层上的孔洞和裂隙与未成膜基体直接接触,在生物膜与样品表面之间形成氧浓差微电池使得局部腐蚀得以发展。红外光谱分析结果显示,培养7 d后两个体系中碳钢样品表面的生物膜内细菌的分泌物大分子不同。

关键词：杀鱼假交替单胞菌抑制腐蚀实验室条件培养模拟海洋流动环境培养氧浓差电池

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磁场对纯Cu微生物腐蚀行为的影响

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中国腐蚀与防护学报 2019年第6期39卷 484-494页

作者：卫晓阳 moradi masoumeh 杨丽景吕战鹏郑必长宋振纶上海大学材料科学与工程学院上海200072 中国科学院宁波材料技术与工程研究所浙江省海洋材料与防护技术重点实验室中国科学院海洋新材料与应用技术重点实验室宁波315201

从位于中国东海的舟山海域海底沉积物中分离提取得到4种细菌,分别为弧菌、威尼斯不动杆菌、河流弧菌及咸海鲜芽孢杆菌。采用电化学测量和表面分析技术研究了外加磁场下纯Cu在4种混合细菌溶液中的腐蚀行为。结果表明,磁场对细菌生长无明... 详细信息

从位于中国东海的舟山海域海底沉积物中分离提取得到4种细菌,分别为弧菌、威尼斯不动杆菌、河流弧菌及咸海鲜芽孢杆菌。采用电化学测量和表面分析技术研究了外加磁场下纯Cu在4种混合细菌溶液中的腐蚀行为。结果表明,磁场对细菌生长无明显影响,但影响Cu表面生物膜的结构与成分,加快生物膜形成与剥落的速率,且磁场越大,附着速度越快。随着磁场增大,生物膜中脂质含量减少,生物膜组成由脂质、蛋白质、碳水化合物转变成蛋白质和碳水化合物,且蛋白质含量降低,碳水化合物含量增多。施加磁场,样品在溶液中的Rct值明显提高,腐蚀电流密度减小,同时表面的点蚀程度减弱,表明磁场可以抑制Cu的微生物腐蚀进程,且磁场强度为60 mT时比28 mT时更能明显抑制Cu的腐蚀。

关键词：混合海洋细菌磁场微生物腐蚀

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