Inhibition of Carbon Steels from Hydrogen-Sulfide Corrosion with Triazoles

L. V. Frolova, Yu. I. Kuznetsov, and O. O. Zel’

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

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Received July 2, 2008

Abstract — The protective effect of six organic triazole series compounds with respect to carbon steels in water chloride solutions with high concentration of H₂S (2 g/l) has been studied. Under these conditions, the most efficient inhibitor of hydrogen-sulfide corrosion is 3-N,N-dibenzoamino-1,2,4-triazole (DBAT) and the least efficient is 1,2,3-benzotriazole. DBAT can suppress or considerably slow down the hydrogen-sulfide corrosion of steels due to the inhibition of both electrode reactions on the surface.