首页|Inhibition of Hydrogen Sulfide Corrosion of Steel by Catamin AB
Inhibition of Hydrogen Sulfide Corrosion of Steel by Catamin AB
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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 H_2S (from 10 to 2000 mg/1) and of the inhibitor (from 25 to 500 mg/1). 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 C_(H_2S) = 2000 mg/1, does not possess high protective properties in the same solutions at C_(H_2S)= 0.0-50.0 mg/1. 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 H_2S, 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.
L. V. Frolova、E. V. Tomina、L. P. Kazanskii
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Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
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