The inhibition mechanism of propargyl alcohol (CH≡CCH2OH [PA]) was investigated for iron (Fe) corrosion in 0.5 M hydrochloric acid (HCl) at elevated temperatures using surface-enhanced Raman scattering (SERS), x-ray photoelectron (XPS), and Fourier transform infrared (FTIR) spectroscopies. SERS spectra of PA adsorbed on an Fe-deposited silver (Ag) electrode revealed that species derived from PA have C=C, =C–H, and C–O bonds. A high inhibitor efficiency (I%) of PA for Fe corrosion in 0.5 M HCl at 70°C was attributed mainly to coverage of the surface with a protective film of PA polymer and partly to adsorption of allyl alcohol (CH2=CHCH2OH [AA]) formed by cathodic reduction of PA. Electroinitiated polymerization of PA at the Fe surface was proposed.
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Aramaki et al. (1997) studied this question.
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