Abstract
The inhibition of surface corrosion of low-alloyed CrMo steel by propargyl alcohol was investigated using the methods of linear polarization and electrochemical impedance spectroscopy (EIS). Tests were carried out in a deareated 0.5 M H₂SO₄ solution in the absence and in the presence of propargyl alcohol (5 mM) at different immersion times at open circuit potential. Propargyl alcohol suppressed both the anodic and cathodic dissolution processes by adsorption and by blocking of active sites. The inhibition efficiency increased as a function of immersion time. The agreement between the inhibition efficiency values calculated from the two types of measurement was quite good. The thickness of the inhibitory film (0.46-0.82 nm) was calculated from EIS measurements.

Key words
low-alloyed steel, corrosion inhibition, propargyl alcohol, inhibition efficiency

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