Microbiologically Influenced Corrosion of Stainless Steel by Sulfate Reducing Bacteria: A Tale of Caution

CORROSION ◽  
10.5006/3467 ◽  
2020 ◽  
Vol 76 (7) ◽  
pp. 639-653
Author(s):  
M.A. Javed ◽  
W.C. Neil ◽  
G. McAdam ◽  
J.W. Moreau ◽  
S.A. Wade
Keyword(s):  
Stainless Steel ◽  
Sulfate Reducing Bacteria ◽  
Microbiologically Influenced Corrosion ◽  
304 Stainless Steel ◽  
General Corrosion ◽  
Care Needs ◽  
Sulfate Reducing ◽  
Test Conditions ◽  
Significant Difference ◽  
Reducing Bacteria

The influence of different experimental media composition and air purging on the potential for microbiologically influenced corrosion (MIC) of Type 304 stainless steel with sulfate-reducing bacteria (SRB) was investigated. Modified Baar’s (MB) medium, MB medium without iron ions and supplemented with sodium chloride (MBN), and air purged MBN medium (MBO) were used. Pitting corrosion attack was found on the surface of the coupons for all of the conditions tested including the abiotic tests, and detailed statistical analysis showed no significant difference between the pitting results. General corrosion and maximum pit penetration rates also showed no difference between the coupons exposed to different test conditions. Interestingly, the pits found on the surface of the coupons in all of the tested conditions were comparable in size/shape and depth to that of the inclusions present on the surface of the stainless steel coupons. These findings suggest that (i) the test conditions studied do not lead to increased corrosion rates of stainless steel with SRBs and (ii) care needs to be taken to avoid the pitfall of misinterpreting the corrosion of inclusions present on the surface of stainless steels, which can occur as a result of cleaning of the coupons, as MIC pits.

Study on Corrosion Inhibition of Glutaraldehyde for 304 Stainless Steel in Simulated Cooling Water Containing Sulfate-Reducing Bacteria

2013 ◽  
Vol 785-786 ◽  
pp. 38-41
Author(s):  
Wei Wei Lin ◽  
Hong Hua Ge ◽  
Li Zhao ◽  
Xue Juan Wang
Keyword(s):  
Stainless Steel ◽  
Electrochemical Impedance ◽  
Cooling Water ◽  
Sulfate Reducing Bacteria ◽  
304 Stainless Steel ◽  
Stainless Steel Electrode ◽  
Steel Electrode ◽  
Sulfate Reducing ◽  
Passive Current ◽  
Reducing Bacteria

Corrosion control of glutaraldehyde biocide for 304 stainless steel in simulated cooling water system containing sulfate-reducing bacteria (SRB) was studied by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The results revealed that impedance values of stainless steel electrode increased gradually while the passive current densities decreased with the increasing concentration of glutaraldehyde. The biocide improved good anti-corrosion performance to stainless steel in bacteria system. The impedance value |Z|0.05 increased from 19.72 kΩ·cm2 to 33.77 kΩ·cm2, and the passive current density reduced from 0.93 μA·cm-2 to 0.16 μA·cm-2 when the glutaraldehyde concentration reached 80 mg/L.

scholarly journals Effect of Sulfate-Reducing Bacteria (SRB) on the Corrosion of Buried Pipe Steel in Acidic Soil Solution

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 625
Author(s):  
Lijuan Chen ◽  
Bo Wei ◽  
Xianghong Xu
Keyword(s):  
Soil Solution ◽  
Steel Surface ◽  
Pipeline Steel ◽  
Electrochemical Techniques ◽  
Sulfate Reducing Bacteria ◽  
Acidic Soil ◽  
Microbiologically Influenced Corrosion ◽  
Soil Environment ◽  
Sulfate Reducing ◽  
Reducing Bacteria

The influence of sulfate-reducing bacteria (SRB) on the corrosion behaviors of X80 pipeline steel was investigated in a soil environment by electrochemical techniques and surface analysis. It was found that SRB grew well in the acidic soil environment and further attached to the coupon surface, resulting in microbiologically influenced corrosion (MIC) of the steel. The corrosion process of X80 steel was significantly affected by the SRB biofilm on the steel surface. Steel corrosion was inhibited by the highly bioactive SRB biofilm at the early stage of the experiment, while SRB can accelerate the corrosion of steel at the later stage of the experiment. The steel surface suffered severe pitting corrosion in the SRB-containing soil solution.

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