STUDIES ON THE MECHANISMS OF CORROSION INHIBITION BY ACETYLENIC-COMPOUNDS IN HYDROCHLORIC-ACID SOLUTION

The inhibitory effects of progargyl alcohol and ethynylcyclohexanol on the corrosion behaviour of carbon steel were studied in aerated and d e-aerated solutions of 5% hydrochloric acid at 30-degrees-C by the pla nned-interval test and electrochemical polarization methods. The time dependence of the corrosion data was practically the same for the inve stigated inhibitors, but ethynylcyclohexanol displayed some specific f eatures. The established relations and the FTIR results for ethynylcyc lohexanol confirm the film formation mechanism involving chemical chan ge of the inhibitor. It is suggested that species with carbonyl groups in conjunction with C--C bonds take part in an oligomerization reacti on.