Inhibition of Hydrogen Sulfide Corrosion of Steel by Catamin AB
L. V. Frolova, E. V. Tomina, L. P. Kazanskii, and Yu. I. Kuznetsov
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
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Received March 16, 2007
Abstract — The protective properties of a quaternary ammonium salt (dimethyl alkyl benzyl ammonium chloride, or catamin AB) have been studied in wide intervals of concentrations of H2S (from 10 to 2000 mg/l) and of the inhibitor (from 25 to 500 mg/l). It is shown that catamin AB, which effectively slows down the corrosion of steels and preserves their plastic properties in aqueous solutions saturated by hydrogen sulfide to approximately 
= 2000 mg/l, does not possess high protective properties in the same solutions at 
= 0.0–50.0 mg/l. According to the results of XPS studies, this fact is connected to the weak adsorption of this inhibitor on the surface of steel in the absence of a film of iron sulfides on it. Based on the XPS data, it has been shown that, in media containing high concentrations of H2S, a thin (a few nanometers thick) film of iron sulfides is formed on steel. This film is covered with a monomolecular layer of catamin AB, impeding the dissolution of the steel and further growth of the sulfide film.
= 2000 mg/l, does not possess high protective properties in the same solutions at = 0.0–50.0 mg/l. According to the results of XPS studies, this fact is connected to the weak adsorption of this inhibitor on the surface of steel in the absence of a film of iron sulfides on it. Based on the XPS data, it has been shown that, in media containing high concentrations of H2S, a thin (a few nanometers thick) film of iron sulfides is formed on steel. This film is covered with a monomolecular layer of catamin AB, impeding the dissolution of the steel and further growth of the sulfide film. DOI: 10.1134/S0033173208070084