Role of air microbes on atmospheric corrosion
2008
Microorganisms enhance deterioration of materials of
construction. In the present study, the influence of air
microbes on existing concrete pile and on mild steel
coupons is reported. Pseudomonas sp., Bacillus sp.,
Micrococcus sp., Moraxella sp., Anthrobacter sp.,
Streptococcus sp., Staphylococcus sp. and Acinetobacter
sp. were identified on the concrete pile. The growth
and distribution of bacteria was due to the presence of
humidity and SO2 in the atmosphere of the industrial
area, leading to the proliferation of microbes on the
materials under study. Corrosion rate of mild steel in
polluted site was found to be 0.116 mmpy, whereas in
an unpolluted site it was only 0.021 mmpy. The higher
rate was due to the simultaneous action of pollutants
and air microbes on corrosion of materials. The study
shows that the atmospheric corrosion of materials in
polluted environment was due to significant contribution
of the combined action of heterotrophic bacteria,
iron bacteria, manganese oxidizing bacteria and thiobacilli.
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