On Inhibition of Hydrogen-Sulfide Corrosion of Steels with Quaternary Ammonium Salts

Yu. I. Kuznetsov, L. V. Frolova, and E. V. Tomina

Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received August 7, 2005

Abstract — The corrosion and electrochemical behavior of carbon steels in standard 0.5% chloride electrolytes acidified with CH₃COOH and saturated with H₂S was studied. The possibility of protecting steels with quaternary ammonium salts (QASs) obtained by reactions of secondary and tertiary amines with benzyl chloride was investigated. It was found that the protective properties of QASs depend on their chemical structures and can be expressed, to a first approximation, in terms of the Linear Gibbs Energy Relation with the use of the hydrophobic f constants and Taft *-constants of the substituents. The presence of hydrophobic and electron-accepting substituents was found to enhance the protective properties of the inhibitors.