A New Inhibitor of Steel Corrosion in Sufuric Acid

Ya. G. Avdeev^a, P. A. Belinskii^a, Yu. I. Kuznetsov^b, and O. O. Zel’^b

^a Tsiolkovskii State Pedagogical University, ul. Stepana Razina 26, Kaluga, 248023 Russia

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^b Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received November 23, 2006

Abstract — A new effective inhibitor of steel corrosion in sulfuric acid, QAS-K1, from the class of quaternary ammonium salts was developed. The effects of the new inhibitor on corrosion of St3 steel in 2 M H₂SO₄ were studied by gravimetry at 25 and 60C. In the individual state, QAS-K1 proved to be more effective than the industrial inhibitor catamine AB from a similar class. Anionic (5.0 mmol/l KI, 50.0 mmol/l KBr, and 5.0 mmol/l KCNS) and molecular (0.44 mmol/l diphenylthiourea (DPTU) and 0.60 mmol/l captax) additions increased the efficiency of the new inhibitor. QAS-K1 in mixtures with KI, KBr, DPTU, and captax appeared to be more effective in hindering steel corrosion in H₂SO₄ than similar mixtures based on catamine AB and tribenzyletha-nolammonium chloride. Mixtures based on QAS-K1 show a predominantly antagonistic action of the compo-nents.