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海水中钢铁锈层的微生物成因及其环境效应

段继周   

  1. 中国科学院 海洋研究所,青岛 266071
  • 收稿日期:2007-12-20 修回日期:2007-12-20 出版日期:2007-12-20 发布日期:2007-12-20

Formation of Rust Layer Influenced by Microorganisms on Steel Immersed in Seawater and Its Environmental Effect

DUAN Ji-zhou   

  1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Shandong, China
  • Received:2007-12-20 Revised:2007-12-20 Online:2007-12-20 Published:2007-12-20

摘要: 研究了海水环境中钢铁腐蚀产物即锈层中的厌氧微生物群落和锈层矿物特征及其相关性。微生物富集培养和初步的分子生物学分析结果表明,海水钢铁锈层中至少生存有硫酸盐还原细菌和铁还原细菌两种厌氧细菌。使用扫描电子显微镜和电子能谱、X- 射线衍射仪等对锈层样品进行了矿物学观察和分析。在外锈层和中间锈层,主要是α, β, γ-FeOOH 等铁(水合)氧化物。铁水合硫酸盐即绿锈则主要出现在内锈层。初步讨论了厌氧细菌作用下的铁腐蚀矿物生成和转化过程,并提出钢铁锈层微生物和矿物在海洋环境的微生物修复中可能具有重要作用。

Abstract: The characteristics of rust layer on steel immersed in seawater and related anaerobic microbial community were investigated. Sulfate-reducing bacteria and iron-reducing bacteria were found in the rust layer by microbial enrichment and molecular biological analysis. The characteristics of rust layer minerals were studied and analyzed by SEM, XRD and EDS. In the outer and middle rust layers, the iron oxides( including α, β, γ-FeOOH) were found, and the green rust was mainly found in the inner rust layer. The formation and transformation of rust layer minerals under the influence of anaerobic bacteria was discussed on the basis of experimental observation. It is also suggested that microorganisms and related rust layer minerals on steel possibly play an important role in marine microbial remediation.