Protect Effectiveness of Steel Corrosion Inhibitors in the Presence of Sulfatereducing Bacteria

Issue 1(67) 2013
Pages 18-24
Purish L.M., Kozlova I.A., Pogrebova I.S.
Keywords: sulfate-reducing bacteria, microbial corrosion, corrosion inhibitors, cationic nitrogen-containing surfactants

Electrochemical and microbiological aspects of microbial induced corrosion of the mild carbon steel in the presence of sulfate-reducing bacteria and its inhibition by organic compounds, including functional groups with Nitrogen, Oxygen and Sulfur atoms were examined. It was established that in the presence of sulfate-reducing bacteria the most effective corrosion inhibitors of the mild carbon steel are cationic Nitrogen-containing surfactants such as DPH, KPI-1, KPI-1М, katapine М and KPI-2М. Adsorbing on the metal surface such inhibitors can affect on hydrogen evolution process on its surface and thus can decrease catalytic function of the bacteria as a cathodic process depolarizer. Evaluation of these organic surfactants adsorbing features and analysis of their influence on electrochemical reactions kinetics allow elaborating the high-effective inhibitors of steel microbial corrosion in aggressive environment with sulfate-reducing bacteria.