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International Journal of Corrosion
Volume 2018, Article ID 7491501, 14 pages
https://doi.org/10.1155/2018/7491501
Research Article

Synergistic Effect of Carbamide and Sulfate Reducing Bacteria on Corrosion Behavior of Carbon Steel in Soil

1Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325, USA
2State Key Laboratory for Corrosion and Protection, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China

Correspondence should be addressed to Ximing Li; moc.liamg@2102ilmx

Received 31 January 2018; Revised 8 June 2018; Accepted 28 June 2018; Published 1 August 2018

Academic Editor: Ramazan Solmaz

Copyright © 2018 Ximing Li and Cheng Sun. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Synergistic effect of carbamide and sulfate reducing bacteria (SRB) on corrosion behavior of carbon steel was studied in soils with moisture of 20% and 30%, by soil properties measurement, weight loss, polarization curve, and electrochemical impedance spectroscopy. The results show that carbamide decreased the soil redox potential and increased soil pH. In soil without SRB, carbamide made corrosion potential of Q235 steel much more positive and then inhibited corrosion. Meanwhile, in soil with SRB, 0.5 wt% carbamide restrained SRB growth and inhibited biocorrosion of Q235 steel. Corrosion rate of carbon steel decreased in soil with 30% moisture compared with that with 20% moisture.