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INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA

Senka Gudić ; University of Split, Faculty of Chemistry and Technology, Department of Electrochemistry and Materials Protection, Ruđera Boškovića 35, HR-21000 Split, Croatia
Marija Zlatunić ; University of Split, Faculty of Chemistry and Technology, Department of Electrochemistry and Materials Protection, Ruđera Boškovića 35, HR-21000 Split, Croatia
Ladislav Vrsalović ; University of Split, Faculty of Chemistry and Technology, Department of Electrochemistry and Materials Protection, Ruđera Boškovića 35, HR-21000 Split, Croatia
Ani Radonić ; University of Split, Faculty of Chemistry and Technology, Department of Organic Chemistry, Ruđera Boškovića 35, HR-21000 Split, Croatia

Puni tekst: engleski, pdf (556 KB) str. 6-11 preuzimanja: 59* citiraj
APA 6th Edition
Gudić, S., Zlatunić, M., Vrsalović, L. i Radonić, A. (2018). INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA. Hrana u zdravlju i bolesti, 7 (1), 6-11. Preuzeto s https://hrcak.srce.hr/218577
MLA 8th Edition
Gudić, Senka, et al. "INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA." Hrana u zdravlju i bolesti, vol. 7, br. 1, 2018, str. 6-11. https://hrcak.srce.hr/218577. Citirano 04.08.2020.
Chicago 17th Edition
Gudić, Senka, Marija Zlatunić, Ladislav Vrsalović i Ani Radonić. "INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA." Hrana u zdravlju i bolesti 7, br. 1 (2018): 6-11. https://hrcak.srce.hr/218577
Harvard
Gudić, S., et al. (2018). 'INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA', Hrana u zdravlju i bolesti, 7(1), str. 6-11. Preuzeto s: https://hrcak.srce.hr/218577 (Datum pristupa: 04.08.2020.)
Vancouver
Gudić S, Zlatunić M, Vrsalović L, Radonić A. INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA. Hrana u zdravlju i bolesti [Internet]. 2018 [pristupljeno 04.08.2020.];7(1):6-11. Dostupno na: https://hrcak.srce.hr/218577
IEEE
S. Gudić, M. Zlatunić, L. Vrsalović i A. Radonić, "INHIBITION OF ALUMINIUM ALLOY CORROSION IN CHLORIDE SOLUTION BY CAFFEINE ISOLATED FROM BLACK TEA", Hrana u zdravlju i bolesti, vol.7, br. 1, str. 6-11, 2018. [Online]. Dostupno na: https://hrcak.srce.hr/218577. [Citirano: 04.08.2020.]

Sažetak
Caffeine (1,3,7-trimethylxanthine) was isolated from black tea and characterised using different physical methods. The corrosion inhibition performance of the caffeine isolate (in concentration from 110-5 to 110-3 mol/dm3) on aluminium alloy corrosion in neutral 0.5 mol/dm3 NaCl solution was investigated using potentiodynamic and linear polarization measurements at 20 C. Corrosion potential, corrosion current and polarization resistance were determined and surface coverage of inhibitor molecules and inhibition efficiency were calculated. The obtained results show that caffeine effectively inhibited the corrosion reaction in the chloride solution with an inhibition efficiency of up to  76%. Furthermore, caffeine was found to function essentially as a mixed type with a higher influence on cathodic reaction. The adsorption behaviour of investigated inhibitor can be described by the Freundlich adsorption isotherm. The adsorption free energy closes to -10 kJ/mol indicates physical adsorption of the caffeine on the aluminium alloy surface in NaCl solution.

Ključne riječi
aluminium alloy; corrosion; inhibition; caffeine

Hrčak ID: 218577

URI
https://hrcak.srce.hr/218577

Posjeta: 137 *