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.
Highlights
IntroductionThere are numerous factors influencing the soil aggressiveness such as soil humidity, acidity, soil salinity, and composition of microbes [1,2,3,4]
Soil corrosion is one of most common corrosion behaviors of metals underground
There are reports that carbamide can be used as a noncorroding alternative to rock salt for road deicing
Summary
There are numerous factors influencing the soil aggressiveness such as soil humidity, acidity, soil salinity, and composition of microbes [1,2,3,4]. These factors interchange over time, making soil corrosion study much more complicated. PH, soil acidity, is a comprehensive reflection of soil chemical properties, especially the salt content. It affects both anode and cathode polarization process, which are related to corrosion dynamics [5]. In soils with a high content of organic matters and organic acid, even with pH being neutral, metals can still suffer serious corrosion [11]
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