Izvorni znanstveni članak
https://doi.org/10.15255/CABEQ.2023.2180
Antioxidant Capacity and Corrosion Inhibition Efficiency of Sambucus nigra L. Extract
I. Martinović
; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice Hrvatske bb, Mostar, Bosnia and Herzegovina
G. Zlatić
; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice Hrvatske bb, Mostar, Bosnia and Herzegovina
Z. Pilić
; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice Hrvatske bb, Mostar, Bosnia and Herzegovina
M. Šušak
; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice Hrvatske bb, Mostar, Bosnia and Herzegovina
F. Falak
; Department of Chemistry, Faculty of Science and Education, University of Mostar, Matice Hrvatske bb, Mostar, Bosnia and Herzegovina
Sažetak
The cyclic voltammogram recorded in the potential range between 0 V and 800 mV with scan rate of 100 mV s−1 was used to determine the measure of antioxidants content (antioxidant capacity) present in Sambucus nigra L. extract. The antioxidant capacity of the extract was 4.06 mg GAE g −1 fw (mg of gallic acid equivalents per gram of fresh weight of the extract). The corrosion inhibition efficiency of Sambucus nigra L. extract on aluminium, copper, and bronze in 3 % NaCl solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. Polarization data showed that extract acted as a mixed-type inhibitor, that the corrosion inhibition process was spontaneous physical adsorption (ΔG ≈ –16 kJ mol–1) of the extract molecules on metals surfaces and followed Freundlich isotherm. Impedance spectroscopy studies revealed that increasing the concentration of extract reduced the double-layer capacitance and increased the charge transfer resistance. The highest inhibition efficiencies (Cu: ~ 57 %, CuSn14: ~74 % and Al: ~58 %) were achieved for an extract concentration of 1.0 g L–1.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Ključne riječi
antioxidant capacity; corrosion; inhibition; Sambucus nigra L. extract
Hrčak ID:
305249
URI
Datum izdavanja:
2.7.2023.
Posjeta: 207 *