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海洋细菌Streptomyces flavus在Fe3Al表面附着 过程及其腐蚀机制研究

发表时间:2018-03-30  浏览量:936  下载量:119
全部作者: 常雪婷,唐斯锴,孙士斌,尹衍升,董丽华
作者单位: 上海海事大学海洋科学与工程学院;上海海事大学物流工程学院
摘 要: 通过扫描电子显微镜(scanning electron microscope,SEM)和原子力显微镜(atomic force microscope,AFM)观测海洋微生物黄色链霉菌(Streptomyces flavus)在Fe3Al金属间化合物表面的成膜过程及试样腐蚀形貌,探讨微生物膜的形成过程及其对材料表面腐蚀的影响。结果表明,S. flavus易附着在Fe3Al表面,浸泡24 h后发现明显的活细菌附着,S. flavus尺寸约为0.8 μm,基内菌丝半径约为0.5 μm;随着浸泡时间的延长,该菌在Fe3Al表面形成的微生物膜从初期的“玫瑰花瓣”状Al2O3组织转变为均匀的“蜂窝”状组织,表面接触角由疏水性的105.33°降至亲水性的88.11°左右,引起溶液中NO2的吸附,与Fe3+反应生成钝化物Fe2O3,又提高了表面疏水性能,使接触角提高到105.20°,在一定程度上减轻了酸性环境对Fe3Al的腐蚀作用。
关 键 词: 材料失效与保护;金属间化合物;微生物腐蚀;海洋腐蚀
Title: Adhesion process and corrosion mechanism of marine bacteria Streptomyces flavus on Fe3Al surface
Author: CHANG Xueting, TANG Sikai, SUN Shibin, YIN Yansheng, DONG Lihua
Organization: College of Ocean Science and Engineering, Shanghai Maritime University; Logistics Engineering College, Shanghai Maritime University
Abstract: Film-forming process of Streptomyces flavus on the surface of Fe3Al and corrosion surface of Fe3Al were investigated by scanning electron microscope (SEM) and atomic force microscope (AFM). Results showed that the S. flavus was easy to attach on the surface of Fe3Al and there were obvious live bacteria attached after immersing for 24 h. The size of S. flavus was 0.8 μm and the radius of substrate mycelium was 0.5 μm. The microbial film which was mainly composed of Al2O3 with rose-like morphology at the initial stage attached on the Fe3Al surface, was then gradually covered by the homogenous honeycomb-like microbial secretion membrane with the increasing immersion time. The surface wettability alternated from hydrophobic to hydrophilic, when the surface contact angle changed from 105.33° to 88.11°. The microbial membrane absorbed NO2 in the culture medium, then the reaction of NO2 and Fe3+ was conducted to generate Fe2O3 which could improve the surface contact angle to 105.20° and partly reduce the corrosion of Fe3Al in the acid environment.
Key words: materials failure and protection; intermetallic compound; microbiologically influenced corrosion; marine corrosion
发表期数: 2018年3月第6期
引用格式: 常雪婷,唐斯锴,孙士斌,等. 海洋细菌Streptomyces flavus在Fe3Al表面附着 过程及其腐蚀机制研究[J]. 中国科技论文在线精品论文,2018,11(6):562-569.
 
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