Application of Impedance Spectroscopy for Estimation of SO2 and Inhibited Oil Film Effect on Partial Electrode Reactions Kinetics on Steel

Issue 2(80) 2016
Pages 11-21

V.I. Vigdorovich1, L.E. Tsygankova2, N.V. Shel3, P.N. Bernatsky2


1All-Russian Scientific Institute of Machinery and Oil-products Application in Agriculture, Tambov
2Tambov State University named after G.R. Derzhavin
3Tambov State Technical University


Keywords: impedance spectroscopy, steel, sodium chloride, solution, transfer resistance, cathodic, anodic reaction, diffusion, capacity, double electric layer, inhibitor, emulgin

Kinetics of partial electrode reactions on St3 carbon steel has been studied in 0,5 M NaCl solutions by the electrochemical impedance spectroscopy method. Influence of SO2 presence (the initial content in gas phase is 0,1 vol.%), a presence of coating on base of fresh Mobil-1 oil, modified with oil soluble contact corrosion inhibitor (emulgin) is considered. Effect of exposition duration (0,25…24 h) is estimated too. Analysis of the kinetic regularities has been performed on base of cathodic and anodic reaction charge transfer resistance, diffusion mass transfer resistance of cathodic depolarizer and double electric layer capacity.