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2022, vol. 63, br. 2, str. 115-121
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Ispitivanje efikasnosti ekstrakta cvijeta maline kao inhibitora korozije bakra u 3% NaCl
Testing the effectiveness of raspberry flower extract as an inhibitor of copper's corrosion in 3% NaCl
aUniverzitet u Zenici, Metalurško-tehnološki fakultet, Federacija BiH bUniverzitet u Sarajevu, Prirodno-matematički fakultet, Federacija BiH
e-adresa: farzet.bikic@unze.ba
Ključne reči: ekstrakcija; cvet maline; inhibitor; Tafelova ekstrapolacija; potenciodinamička polarizacija; linearna polarizacija; elektrohemijska impedancijska spektroskopija
Sažetak
Rad predstavlja ispitivanje mogućnosti primene ekstrakta cveta maline (Rubus idaeus L.) kao zelenog inhibitora opšte korozije bakra u 3% NaCl. Cvetovi maline (Rubus idaeus L.) sorte Polka su prikupljeni sa lokaliteta Moševac kod Maglaja, Bosna i Hercegovina. Ekstrakt cveta maline sorte Polka u etanolu dobiven je metodom ultrazvučne ekstrakcije. Analizom UV/VIS spektrofotometrijom pronađeno je da ekstrakt cveta maline sadrži značajan sadržaj polifenola. Rezultati dobiveni DC tehnikama (metodama Tafelove ekstrapolacije, potenciodinamske polarizacije i linearne polarizacije) dokazuju da se brzina korozije smanjuje u prisustvu ispitivanog ekstrakta. Ispitivanja provedena metodom elektrohemijske impedancijske spektroskopije dokazuju da ispitivani ekstrakti usporavaju kinetiku korozionog procesa što je vidljivo kroz porast otpora. Rezultati provedenih ispitivanja dokazuju da se u agresivnom mediju, kao što je 3% rastvor NaCl, u svrhu zaštite bakra od korozije može koristiti ekstrakt cveta maline sorte Polka.
Abstract
The paper presents an examination of the possibility of applying raspberry flower extract (Rubus idaeus L.) as a green inhibitor of general corrosion of copper in 3% NaCl. Raspberry flowers (Rubus idaeus L.) sort Polka were collected from the Moševac near Maglaj city, Bosnia and Herzegovina. Raspberry flower extract in ethanol was obtained by ultrasonic extraction. A significant content of polyphenol was found in the raspberry flower extract by UV/VIS spectrophotometry analysis. Results obtained by DC techniques (by the methods of Tafel extrapolation, potentiodynamic polarization and linear polarization) prove that the corrosion rate decreases in the presence of the raspberry flower extract. Tests performed by the method of electrochemical impedance spectroscopy prove that the tested extracts slow down the kinetics of the corrosion process, which is visible through the increase in resistance. The results of the conducted tests prove that in an aggressive medium, such as 3% NaCl solution, Polka raspberry flower extract can be used as an inhibitor of copper's corrosion.
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