Original scientific paper

https://doi.org/10.5562/cca3451

Effect of Helichrysum italicum on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution

Zora Pilić orcid.org/0000-0003-1780-1122 ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina
Ivana Martinović ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina
Marija Pavlinović ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina
Gloria Zlatić ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina

Abstract

The aqueous extract of the Helichrysum italicum leaves (HI) is tested as a corrosion inhibitor of an iron in a simulated acid rain using potentiodynamic polarisation, cyclic voltammetry and electrochemical impedance spectroscopy. Results of all electrochemical methods indicate an increase of a corrosion inhibition efficiency of the iron with the HI extract concentration. Maximum inhibition efficiency (~ 50 %) is obtained at 2.0 g L–1 HI extract. The inhibitive action is assumed to occur via an adsorption of the HI extract on the iron surface. Results indicate that the adsorption process is spontaneous and follows the Freundlich adsorption isotherm. According to the calculated ΔG value (~ 15 kJ mol–1), the corrosion inhibition of the iron occurs predominantly via a physisorption of the HI extract. The concentration of iron ions released into a solution, measured by atomic absorption spectrometry, is in accordance with the electrochemical results.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

iron; simulated acid rain; corrosion; Helichrysum italicum; electrochemical methods

Hrčak ID:

221403

URI

https://hrcak.srce.hr/221403

Publication date:

28.1.2019.

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