Corrosion Control of Mild Steel by Aerobic Bacteria Under Continuous Flow Conditions

Corrosion Control of Mild Steel by Aerobic Bacteria Under Continuous Flow Conditions

ABSTRACTCorrosion of mild steel under aerobic conditions in the presence of a monoculture of aerobic bacteria (Pseudomonas fragi K [P. fragi K]) has been studied in a continuous flow system using electrochemical impedance spectroscopy (EIS). P. fragi K grown in Luria-Bertani (LB) medium causes a 10-...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Vol. 58; no. 5; pp. 417 - 423
Main Authors: Ismail, Kh.M., Gehrig, T., Jayaraman, A., Wood, T.K., Trandem, K., Arps, P.J., Earthman, J.C.
Format: Journal Article
Language:English
Published: Houston, TX NACE International 01-05-2002
NACE
Subjects:
Aerobic bacteria
Aerobic conditions
Analytical methods
Applied sciences
Bacteria
Bacterial corrosion
Biofilms
Continuous flow
Corrosion
Corrosion control
Corrosion effects
Corrosion prevention
Corrosion rate
Electrochemical impedance spectroscopy
Electrochemistry
Exact sciences and technology
Flow rates
Flow system
Flow velocity
Low carbon steels
Metals. Metallurgy
Monoculture
Monoculture (aquaculture)
Nutrient flow
Oxic conditions
Pseudomonas fragi
Scavenging
Spectroscopy
Steel
Corrosion resistance
Mild steel
Aerobiosis
Corrosion
Electrochemical method
Check
Bacteria
Steel
Bacterial corrosion
Experimental study
Corrosion protection
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Summary:ABSTRACTCorrosion of mild steel under aerobic conditions in the presence of a monoculture of aerobic bacteria (Pseudomonas fragi K [P. fragi K]) has been studied in a continuous flow system using electrochemical impedance spectroscopy (EIS). P. fragi K grown in Luria-Bertani (LB) medium causes a 10- to 20-fold decrease in the corrosion rate of mild steel after a biofilm becomes visible on the surface of the samples. Live viable bacteria are necessary for the observed corrosion reduction of mild steel, indicating an active role rather than a barrier effect of the biofilm. Flowing nitrogen through the solution was found to be less effective than P. fragi K in lowering the corrosion rate of mild steel, suggesting that an effect by bacteria, in addition to scavenging oxygen, is involved. The effect of nutrient flow rate on the ability of the bacteria toThe presence of bacterial biofilms is often shown to be associated with elevated corrosion rates.1-2 These attached bacterial colonies can cause serious damage to structures exposed to soil, fresh water, and seawater, and they will affect a variety of metals.3 Controlling the growth of these bacterial colonies with biocides has proven to be very difficult because cells in a biofilm can be up to 500 times more resistant to antibacterial agents than those in fluid suspension. While antibiotics have been designed to kill suspended cells, biofilm bacteria undergo phenotypic changes that make them entirely different from those in suspension.4-7 Furthermore, since no inherently colonizationresistant material has yet been found, there has been no easy answer to this problem.8 Several studies have shown, however, that certain bacterial systems decrease corrosion rates.9-15 In particular, work performed by Pedersen and Hermansson has shown that substantial corrosion reduction is possible in mild steel exposed to monocultures of Pseudomonas sp.S9 and Serratia marcescens EF190 compared to a sterile control.11-12 Pedersen and Hermansson and Jayaraman, et al.,13-14 suggest that this protective behavior was the result
Bibliography:ObjectType-Article-2
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ISSN:0010-9312
1938-159X
DOI:10.5006/1.3277631