Studies on the mechanisms of corrosion inhibition by acetylenic compounds in hydrochloric acid solution

Abstract

The inhibitory effects of progargyl alcohol and ethynylcyclohexanol on the corrosion behaviour of carbon steel were studied in aerated and de-aerated solutions of 5% hydrochloric acid at 30°C by the planned-interval test and electrochemical polarization methods. The time dependence of the corrosion data was practically the same for the investigated inhibitors, but ethynylcyclohexanol displayed some specific features. The established relations and the FTIR results for ethynylcyclohexanol confirm the film formation mechanism involving chemical change of the inhibitor. It is suggested that species with carbonyl groups in conjunction with CC bonds take part in an oligomerization reaction. © 1993.