Effects of Sulfate Reducing Bacteria Adhesion on Formation of Calcareous Deposits under Cathodic Protection Condition and Its Protection for Metals

The effects of sulfate reducing bacteria adhesion on the formation of calcareous deposits under cathodic protection condition and its protection for metals were studied by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and electrochemical impedance spectroscopy (EIS). The experimental results show that the calcareous deposits could still form on the surface of carbon steel after sulfate reducing bacteria adhesion under cathodic protection. No matter the sulfate reducing bacteria adhesion time was long or short, the formation of biofilm resulted in a decrease in the amount of calcareous deposits on the surface of the metal surface and a decrease in protection for metal, which accelerated the sulfate-reducing bacteria localized corrosion.