PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXXIII 2023

Oksana HERTSYK1, Myroslava KOVBUZ1, Olga YEZERSKA2, Natalia PANDIAK3, Myroslava TASHAK4

1Ivan Franko Lviv National University, Kyryla and Mefodiya Str., 6, 79005 Lviv, Ukraine
e-mail: o_hertsyk@yahoo.com

2Fraunhofer Institut Fertigungstechnik Materialforschung, Бремен, Germany

3Ukrainian National Forestry University, Gen. Chuprynka Str. 103, 79057 Lviv, Ukraine

4Lviv Polytechnic National University, St. Geoge`s Square, 5, 79013 Lviv, Ukraine

DOI: https://doi.org/10.37827/ntsh.chem.2023.73.144

FEATURES OF ADSORPTION OF ALCOHOL ON THE SURFACE AMORPHOUS METAL ALLOYS

Adsorption has a specific effect on electrochemical processes, especially those occurring in heterogeneous systems. Adsorption of alcohols on the surface of amorphous alloys occurs according to the scheme of a multistage heterogeneous process with the participation of metal components of the surface: first, molecules such as isopropanol competitively displace water molecules and are attracted to the surface due to electrostatic forces. Along with the physical interaction, a donor-acceptor interaction can occur by charge transfer from the H-O group of the alcohol to individual metal atoms of the AMА surface or their oxides.
Voltammetric characteristics of the contact and outer surfaces of the original AMА in a 0.5 M NaCl aqueous solution at 293 K confirmed the higher probability of the appearance of oxide protective layers on the surface of those amorphous metal alloys that contain, in addition to ferrum, metals with a higher affinity for oxygen and the probability of the formation of reactive intermetallic compounds . Since the outer surface of the alloy strip during the cooling of the melt comes into contact with air and has the possibility to be covered with a protective oxide film, this leads to a decrease in the corrosion current and a shift of the corrosion potentials in the anodic direction under the same research conditions.
Being adsorbed on the metal surface, isopropanol molecules destroy the protective oxide layer and activate the dissolution of the metal. This is especially noticeable on the outer surface of Fe78.5Ni1.0Mo0.5Si14.0B6.0 and Fe73.1Cu1.0Nb3.0Si15.5B7.4 tapes. Nevertheless, in Fe51.7Ni21.7Cr6.2Mo0.6V1.5Si5.2B13.1, which contains elements Cr, Mo, V, oxides, having high adhesion to the surface of the alloy, cannot be replaced by isopropanol molecules. As a result of pre-exposure of AMC electrodes in isopropyl alcohol, adsorption layers and additional diffusion layers are created on the surface, which are sufficient to block the corrosion process. However, the adhesion of alcohol molecules is short-lived, so it is impractical to use isopropyl alcohol to inhibit corrosion processes.

Keywords: : amorphous metal alloys, electrochemical parameters, adsorption, isopropyl alcohol.

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How to Cite

HERTSYK O., KOVBUZ M., YEZERSKA O., PANDIAK N., TASHAK M. Features of adsorption of alcohol on the surface amorphous metal alloys. Proc. Shevchenko Sci. Soc. Chem. Sci. 2023. Vol. LXXIII. P. 144-153.

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