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03555 INFLUENCE OF A DUAL-SPECIES BIOFILM ON THE CORROSION OF MILD STEEL

Picture for 03555 Microbiologically Influenced Corrosion
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Product Number: 51300-03555-SG
ISBN: 03555 2003 CP
Author: Anthea K. Lee and Dianne K. Newman
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We used Electrochemical Impedance Spectroscopy (EIS) to examine the corrosion properties of mild carbon steel in the presence of the iron-reducing bacterium Shewanella oneidensis and the sulfate-reducing bacterium Desulfovibrio desulfuricans. We also tested the sensitivity of EIS to see if this technique could distinguish between different ratios of mixed cultures. We find that while Bode plots and Rp values generated from EIS data are distinct for each species, this data could not differentiate between pure D. desulfuricans cultures and mixed cultures. Ecorr values, however, could distinguish between different inoculums of D. desulfuricans. Keywords: Shewanella oneidensis, Desulfovibrio desulfuricans, corrosion inhibition, iron reduction, sulfate reduction
We used Electrochemical Impedance Spectroscopy (EIS) to examine the corrosion properties of mild carbon steel in the presence of the iron-reducing bacterium Shewanella oneidensis and the sulfate-reducing bacterium Desulfovibrio desulfuricans. We also tested the sensitivity of EIS to see if this technique could distinguish between different ratios of mixed cultures. We find that while Bode plots and Rp values generated from EIS data are distinct for each species, this data could not differentiate between pure D. desulfuricans cultures and mixed cultures. Ecorr values, however, could distinguish between different inoculums of D. desulfuricans. Keywords: Shewanella oneidensis, Desulfovibrio desulfuricans, corrosion inhibition, iron reduction, sulfate reduction
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