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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13290
Title: Microbial influenced corrosion by thermophilic bacteria
Authors: Lata S.
Sharma, Chhaya
Singh A.K.
Published in: Journal of Corrosion Science and Engineering
Abstract: Microbial influenced corrosion (MIC) plays important role in curtailing useful life of steel machinery in many industries. While many investigations have been reported on microbial corrosion due to sulphate reducing bacteria (SRB), most of them are related to mesophilic species. Fewer studies have been done on the corrosion aspects of thermophilic bacteria although these bacteria have been identified frequently in industrial media having moderately high temperatures e.g. condenser in electric power unit, oil wells etc. where corrosion of the metals has been detected. Accordingly, work was undertaken on corrosion due to Desulfotomaculum nigrificans. The purpose of the study was to investigate MIC on stainless steels and to correlate it with the growth of the biofilm by monitoring the compositon of its extracellular polymeric substances (EPS). Stainless steel 304L, 316L and 2205 were selected for the test. Modified Baar's media, control and inoculated, were used as test solutions in anaerobic conditions. Electrochemical polarization and immersion tests were performed to estimate the extent of corrosion rate and pitting attack. Extent of corrosion and chemicals present in/outside pit was determined by scanning electron microscopy (SEM)/ energy dispersive spectroscopy (EDS). The composition of EPS, component of biofilm, was determined by UV/visible spectroscopy. This work shows that SRB's degrade own EPS. Correlations of extent of corrosion attack with the composition of the EPS of the biofilm formed on test samples indicate maximum corrosive conditions when bacterial concentration is maximum which in turn minimizes the amount of carbohydrate and protein contents along with the increase in fraction of uronic acid in carbohydrate in EPS of the biofilm. Stainless steel 2205 shows maximum corrosion resistance followed by 316L and 304L. © 2011 University of Manchester and the authors.
Citation: Journal of Corrosion Science and Engineering (2011), 14(): -
URI: http://repository.iitr.ac.in/handle/123456789/13290
Issue Date: 2011
Keywords: Desulfotomaculum nigrificans
Electrochemical polarization
Extracellular polymeric substances
Stainless steel
Weight loss
ISSN: 14668858
Author Scopus IDs: 15020898900
7202115183
57202898207
Author Affiliations: Lata, S., Department of Paper Technology, IIT-Roorkee, Saharanpur Campus, Saharanpur-247001, India
Sharma, C., Department of Paper Technology, IIT-Roorkee, Saharanpur Campus, Saharanpur-247001, India
Singh, A.K., Department of Paper Technology, IIT-Roorkee, Saharanpur Campus, Saharanpur-247001, India
Corresponding Author: Lata, S.; Department of Paper Technology, IIT-Roorkee, Saharanpur Campus, Saharanpur-247001, India
Appears in Collections:Journal Publications [PT]

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