Antioxidant Capacity and Corrosion Inhibition Efficiency of Sambucus nigra L. Extract
| Autor: | I. Martinović, G. Zlatić, Z. Pilić, M. Šušak, F. Falak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Chemical and Biochemical Engineering Quarterly, Vol 37, Iss 2, Pp 79-87 (2023) |
| Druh dokumentu: | article |
| ISSN: | 0352-9568 1846-5153 |
| DOI: | 10.15255/CABEQ.2023.2180 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|