Surface-Enhanced Raman Scattering Spectroscopy Studies on the Inhibition Mechanism of Propargyl Alcohol for Iron Corrosion in Hydrochloric Acid

1 February 1996

journal article
Published by Association for Materials Protection and Performance (AMPP) in Corrosion

Vol. 52 (2) , 83-91
https://doi.org/10.5006/1.3292107

Abstract

In situ spectroscopic information on species adsorbed on the surface of iron in hydrochloric acid (HCl) solutions at 25°C was obtained by surface-enhanced Raman scattering (SERS) spectroscopy of propargyl alcohol (HC≡CCH2OH, or PA) using a SERS-active silver electrode covered with a thin layer of deposited iron. The SERS spectra of PA indicated the absence of a C≡C bond and the presence of C=C, =C-H, and C-O bonds in the species derived from PA at the surface. Polarization curves of iron in 0.5 M HCl at 25°C showed inhibition of the anodic process rather than of the cathodic one. Coverage of the iron surface with a film of the PA polymer and adsorption of allyl alcohol (CH2=CHCH2OH, or AA) on the surface were concluded from the results.

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