Effects of Sulfate-Reducing Bacteria on the Corrosion of Q235

2011 ◽  
Vol 396-398 ◽  
pp. 1777-1785
Author(s):  
Fu Shao Li ◽  
Mao Zhong An ◽  
Dong Xia Duan
Keyword(s):  
Culture Medium ◽  
Early Stage ◽  
Exposure Period ◽  
Sulfate Reducing Bacteria ◽  
Localized Corrosion ◽  
Iron Sulfides ◽  
Active Dissolution ◽  
Sulfate Reducing ◽  
Q235 Carbon Steel ◽  
Reducing Bacteria

Various corrosion media were prepared by dual-cells experimental setup, including fresh sterilized culture medium, culture medium with sulfate-reducing bacteria (SRB), and culture medium containing only SRB metabolites. Corrosion exposure tests of Q235 carbon steel were conducted in these media, and effects of SRB on the corrosion behavior of Q235 were studied by electrochemical methods and surface analyses. As the results, Q235 was uniformly corroded in the fresh sterilized culture medium in a mode of active dissolution; in the culture medium of SRB, Q235 was protected by the iron sulfides layer to some extent in the early stage of exposure, but severely localized corrosion subsequently occurred resulting from the localized breakdown of iron sulfides layer in presence of SRB and SRB biofilm; while in the culture medium containing only SRB metabolites, Q235 was well protected over the whole exposure period, suggesting that a uniform and stable layer of iron sulfides was formed in this medium.

Corrosion Behavior of Low Nickel Alloy High Strength Steel in Seawater Containing Sulfate-Reducing Bacteria

2011 ◽  
Vol 368-373 ◽  
pp. 42-47
Author(s):  
Fu Shao Li ◽  
Mao Zhong An ◽  
Dong Xia Duan
Keyword(s):  
Nickel Alloy ◽  
High Strength Steel ◽  
Culture Medium ◽  
Electrochemical Impedance ◽  
High Strength ◽  
Sulfate Reducing Bacteria ◽  
Iron Sulfides ◽  
Active Dissolution ◽  
Sulfate Reducing ◽  
Reducing Bacteria

Corrosion behaviors of low nickel alloy high strength steel (LNAHSS) was studied by electrochemical impedance spectroscopy and scanning electron microscopy when the coupons of LNAHSS were exposed to the seawater culture media. As the results, LNAHSS was uniformly corroded in the fresh sterilized culture medium in a mode of active dissolution; in the culture medium with sulfate-reducing bacteria (SRB), LNAHSS was protected by the iron sulfides layer to some extent in the early stage of exposure, but severely localized corrosion subsequently occurred resulting from the localized breakdown of iron sulfides layer. So, in risks estimation, special precautions should be taken when LNAHSS serves in the environments containing SRB as the localized area can become the tress raiser.

Effects of Nutrition on Mild Steel Corrosion by Sulfate Reducing Bacteria under Aerobic Environment

2015 ◽  
Vol 814 ◽  
pp. 625-630
Author(s):  
Dong Xia Duan ◽  
Cun Guo Lin ◽  
Guang Zhou Liu ◽  
Ping Yao
Keyword(s):  
Mild Steel ◽  
Culture Medium ◽  
Iron Sulfide ◽  
Steel Corrosion ◽  
Sulfate Reducing Bacteria ◽  
Marine Water ◽  
Sulfate Reducing ◽  
Mild Steel Corrosion ◽  
Artificial Biofilm ◽  
Reducing Bacteria

Sulfate reducing bacteria (SRB) are traditionally considered as anaerobic organism. In this paper, the potential of sulfate reducing bacteria to cause mild steel corrosion under aerobic situation was investigated. Natural biopolymer agar and sulfate reducing bacteria cells were used to produce artificial biofilm. Micro-sensors were used to investigate the microenvironment in artificial biofilm. Environmental scanning electron microscopy and energy dispersive spectroscopy were used to study mild steel corrosion covered by artificial biofilm. The results indicated that SRB could grow and reduce sulfate both in suspension and in biofilm. The hydrogen sulfide produced by SRB and mild steel corrosion were influenced by the nutrients in the environment. The concentration of H2S in SRB biofilm exposed to culture medium was as twenty times as that exposed to marine water. The main corrosion product of mild steel in culture medium was iron sulfide, whereas the main product of mild steel in marine water was iron oxide.

scholarly journals Deposition of Biogenic Iron Minerals in a Methane Oxidizing Microbial Mat

Archaea ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Christoph Wrede ◽  
Sebastian Kokoschka ◽  
Anne Dreier ◽  
Christina Heller ◽  
Joachim Reitner ◽  
...  
Keyword(s):  
Microbial Mats ◽  
Sulfate Reducing Bacteria ◽  
Microbial Reduction ◽  
Microbial Mat ◽  
The Black Sea ◽  
Anaerobic Oxidation Of Methane ◽  
Iron Sulfides ◽  
Sulfate Reducing ◽  
Reducing Bacteria ◽  
Biogenic Iron

The syntrophic community between anaerobic methanotrophic archaea and sulfate reducing bacteria forms thick, black layers within multi-layered microbial mats in chimney-like carbonate concretions of methane seeps located in the Black Sea Crimean shelf. The microbial consortium conducts anaerobic oxidation of methane, which leads to the formation of mainly two biomineral by-products, calcium carbonates and iron sulfides, building up these chimneys. Iron sulfides are generated by the microbial reduction of oxidized sulfur compounds in the microbial mats. Here we show that sulfate reducing bacteria deposit biogenic iron sulfides extra- and intracellularly, the latter in magnetosome-like chains. These chains appear to be stable after cell lysis and tend to attach to cell debris within the microbial mat. The particles may be important nuclei for larger iron sulfide mineral aggregates.

Corrosion characteristics of sulfate-reducing bacteria (SRB) and the role of molecular biology in SRB studies: an overview

2016 ◽  
Vol 34 (1-2) ◽  
pp. 41-63 ◽  
Author(s):  
Balakrishnan Anandkumar ◽  
Rani P. George ◽  
Sundaram Maruthamuthu ◽  
Natarajan Parvathavarthini ◽  
Uthandi Kamachi Mudali
Keyword(s):  
Molecular Biology ◽  
Sulfate Reducing Bacteria ◽  
Microbiologically Influenced Corrosion ◽  
Bacterial Group ◽  
Iron Sulfides ◽  
Sulfate Reducing ◽  
Molecular Approaches ◽  
Citrate Metabolism ◽  
Reducing Bacteria

AbstractSulfate-reducing bacteria (SRB), an anaerobic bacterial group, are found in many environments like freshwater, marine sediments, agricultural soil, and oil wells where sulfate is present. SRB derives energy from electron donors such as sulfate, elemental sulfur or metals, and fermenting nitrate. It is the major bacterial group involved in the microbiologically influenced corrosion (MIC), souring, and biofouling problems in oil-gas-producing facilities as well as transporting and storage facilities. SRB utilizes sulfate ions as an electron acceptor and produce H2S, which is an agent of corrosion, causing severe economic damages. Various theories have been proposed on the direct involvement of H2S and iron sulfides in corrosion; H2S directly attacks and causes corrosion of metals and alloys. Many reviews have been presented on the aforementioned aspects. This review specifically focused on SRB corrosion and the role of molecular biology tools in SRB corrosion studies viz. cathodic and anodic depolarization theories, corrosion characteristics of thermophilic SRB and influence of hydrogenase, temperature, and pressure in thermophilic SRB corrosion, SRB taxonomy, molecular approaches adopted in SRB taxonomical studies, sulfate and citrate metabolism analyses in completed SRB genomes, and comparative studies on SRB’s dissimilatory sulfite reductase structures.

scholarly journals Assessing the Role of Iron Sulfides in the Long Term Sequestration of Uranium by Sulfate-Reducing Bacteria

2013 ◽  
Author(s):  
Kim F. Hayes ◽  
Yuqiang Bi ◽  
Julian Carpenter ◽  
Sung Pil Hyng ◽  
Bruce E. Rittmann ◽  
...  
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Iron Sulfides ◽  
Sulfate Reducing ◽  
Reducing Bacteria

Iron sulfides and sulfur species produced at hematite surfaces in the presence of sulfate-reducing bacteria

2001 ◽  
Vol 65 (2) ◽  
pp. 223-235 ◽  
Author(s):  
Andrew L Neal ◽  
Somkiet Techkarnjanaruk ◽  
Alice Dohnalkova ◽  
David McCready ◽  
Brent M Peyton ◽  
...  
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Iron Sulfides ◽  
Sulfur Species ◽  
Sulfate Reducing ◽  
Reducing Bacteria
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