Estimate of Contributions of Polysulfide Film and Inhibitor to the Protection of Steel from Hydrogen-Sulfide Corrosion

V. I. Vigdorovich^a and S. A. Zakurnaev^b

^a Tambov State Technical University, Tambov, Russia

^b Tambov State University, Tambov, Russia

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Received October 28, 2008

Abstract — A method for estimating the contributions of film formed on a corrosive surface in aggressive medium favoring its formation and INKORGAS-T30 inhibitor at the inhibition of corrosion in steel has been proposed. Experimental results obtained by studying the behavior of the St3 carbon steel in mineralized chloride medium (5 wt % NaCl) containing 50–400 mg/l H₂S and the addition of an inhibitor have been presented. Using the polarization resistance method, the protective efficacy of oxide and polysulfide surface films and an inhibitor has been estimated as a function of the duration of the action of the aggressive medium, hydrogen sulfide concentration, and the corrosion inhibitor.