Effects of sulfate reducing bacteria on corrosion of the carbon steel Q235 have been investigated in soil-extract solutions (SES). The results show that SRB dramatically decreases the corrosion rate of the carbon steel due to the reason that SRB increases the protective ability of the films. Elements S are observed under the corrosion products of the steel, but not on the surface of the products. SRB promotes the alkalization of the SES. The procedures of SRB influenced corrosion are described.
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