Journal
CORROSION SCIENCE
Volume 199, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110210
Keywords
Carbon steel; Under-deposit corrosion; Microbiologically influenced corrosion; Sulfate reducing bacteria; Synergistic effect
Funding
- Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province [2017CL18]
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The synergistic effects of deposits and sulfate reducing bacteria (SRB) on the corrosion of carbon steel were investigated through experiments. The results showed that deposits and SRB contributed synergistically to both uniform and localized corrosion. The uneven distribution of iron sulfides produced by SRB promoted under-deposit corrosion (UDC), while deposits accelerated SRB corrosion due to UDC-induced accumulation of SRB.
The synergistic effects of deposits and sulfate reducing bacteria (SRB) on the corrosion of a carbon steel are clarified by purposely designing four groups of experiments. The weight loss combined with electrochemical measurements and the surface profiling determine quantitatively that deposits and SRB contribute synergistically similar to 75% and similar to 49% to uniform and localized corrosion, respectively. Based on the experimental evidence, the synergism is explained in terms of the promotion effects of SRB on under-deposit corrosion (UDC) due to unevenly distributed iron sulfides produced by SRB and the acceleration effects of deposits on SRB corrosion resulting from UDC-induced accumulation of SRB.
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