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Cooling water is generally contained naturally occurring all living organisms and nutrients present in it are responsible for uncontrolled multiplication of the living organisms. Among them SRB are initiating the pitting on both stainless steel and mild steel metals by producing H₂S & the formation of black sulphides (FeS) shows black shiny look.The spices Desulfomonas & Desulfobacillus are commonly found in recirculating system. SRB take part in the formation & stabilization of Biofilm along with Bacillus and Pseudomonas species. Thus they developed Microbial Induced Corrosion (MIC) on heat exchangers surfaces, which reduces the cross sectional area of heat exchangers thereby reducing efficiency of plant.

The corrosion of copper alloy B10 induced by sulfate-reducing bacteria (SRB) was studied in seawater. Electrochemical impedance spectroscopy (EIS) was used to analyze the electrochemical corrosion behavior. The surface properties of the corrosion samples were analyzed by electronic microscope (SEM). Through circuit modeling, The results confirmed that the extensive localized corrosion activity of SRB is due to a formed biofilm and a porous iron sulfide layer on the metal surface. SEM revealed the presence of SRB increased the pitting corrosion that maybe attribute to the inhomogeneous distribution of SRB biofilms. The results indicated that the existence of SRB hold back the formation of passive film on the B10 surface and increased the corrosion rate.