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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13291
Title: Microbial influenced corrosion due to Desulfovibrio desulfuricans
Authors: Singh A.
Sharma, Chhaya
Lata S.
Published in: Anti-Corrosion Methods and Materials
Abstract: Purpose: The purpose of this paper is to investigate microbially induced corrosion on stainless steels due to sulfate reducing bacteria sp. Desulfovibrio desulfuricans and correlate it with the composition of extracellular polymeric substances (EPS) of the biofilm formed by these bacteria. Design/methodology/approach: Stainless steels 304L, 316L and 2205 were selected for the test. Modified Baar's media, both control and inoculated, were used as test solutions in anaerobic conditions. The bacteria were identified by scanning electron microscopy and their growth was estimated by bacterial counting. Electrochemical polarization and immersion test were performed to estimate the corrosion rate and the extent of pitting attack. The degree of corrosion and the presence of chemicals present inside/outside pits were determined by SEM/EDS. Biofilm formed on corroded coupons was analyzed spectroscopically to identify its components. An attempt was made to correlate the extent of corrosion with the bacterial concentration and the EPS of the biofilm. The differing corrosion performances of the stainless steels also were compared. Findings: The corrosivity of the solution increased with the addition of SRBs and with increased incubation time. The amount of carbohydrate and protein in EPS was observed to be a minimum when conditions were most corrosive. However, as the corrosivity decreased, these amounts increased. Stainless steel 2205 showed the highest corrosion resistance, followed by 316L and 304L. Originality/value: This work shows that SRB degrades its own EPS. Further, the extent of microbial corrosion on stainless steel coupons due to the presence of SRB correlates with the carbohydrate and protein contents of the EPS of the biofilm. © Emerald Group Publishing Limited.
Citation: Anti-Corrosion Methods and Materials (2011), 58(6): 315-322
URI: https://doi.org/10.1108/00035591111178873
http://repository.iitr.ac.in/handle/123456789/13291
Issue Date: 2011
Keywords: Bacteria
Corrosion
Microbiology
Stainless steel
ISSN: 35599
Author Scopus IDs: 57202898207
7202115183
15020898900
Author Affiliations: Singh, A., Department of Paper Technology, Indian Institute of Roorkee, Saharanpur, India
Sharma, C., Department of Paper Technology, Indian Institute of Roorkee, Saharanpur, India
Lata, S., Department of Paper Technology, Indian Institute of Roorkee, Saharanpur, India
Corresponding Author: Singh, A.; Department of Paper Technology, Indian Institute of Roorkee, Saharanpur, India; email: ajaysfpt@iitr.ernet.in
Appears in Collections:Journal Publications [PT]

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