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Croatica Chemica Acta, Vol. 94 No. 2, 2021.

Original scientific paper

https://doi.org/10.5562/cca3858

Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Ivana Martinović orcid id orcid.org/0000-0003-1784-4018 ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina
Zora Pilić orcid id orcid.org/0000-0003-1780-1122 ; 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
Marija Barišić ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina
Stipe Čelan orcid id orcid.org/0000-0002-4206-6345 ; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice hrvatske bb, Mostar, Bosnia and Herzegovina

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Abstract

Extract of Alchemilla vulgaris L. was investigated as eco-friendly corrosion inhibitor for aluminium in 3 % NaCl using electrochemical techniques. According to the results, inhibition efficiency increases with the increase concentration of extract and the highest efficiency (~80 %) is recorded for the maximal concentration of extract (1.0 g L–1). The inhibition activity of extract occurs by the spontaneous physisorption (ΔG ≈ –16 kJ mol–1) on active sites of aluminium surface that follows Freundlich isotherm. Polarization curves showed that Alchemilla vulgaris L. extract act s a mixed-type inhibitor. The effect of temperature on the aluminium corrosion and inhibition action of extract was studied and the result showed that the corrosion rate increased and the inhibitor efficiency decreased with increase of temperature. The calculated values of the activation energy confirmed presence of inhibitive Alchemilla vulgaris L. extract on aluminium surface.

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

Keywords

aluminium; corrosion inhibition; Alchemilla vulgaris L. extract; adsorption; electrochemical methods

Hrčak ID:

272525

URI

https://hrcak.srce.hr/272525

Publication date:

16.12.2021.

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