Naslov
Inhibition of aluminium alloy corrosion in chloride solution by caffeine isolated from black tea

Autori
Gudić, Senka ; Zlatunić, Marija ; Vrsalović, Ladislav ; Radonić, Ani

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Knjiga sažetaka s 11. međunarodnog znanstveno-stručnog skupa Hranom do zdravlja / - , 2018, 78-78

Skup
11th International Scientific and Professional Conference „With food to health“ = 11. međunarodni znanstveno-stručni skup Hranom do zdravlja

Mjesto i datum
Split, Hrvatska, 18.10.2018. - 19.10.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Recenziran

Ključne riječi
aluminium alloy, corrosion, inhibition, caffeine

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 1x10 -5 to 1x10 -3 mol dm -3 ) on aluminium alloy corrosion in neutral 0.5 mol dm -3 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 efficacy were calculated. The obtained results show that caffeine effectively inhibited the corrosion reaction in the chloride solution with an inhibition efficiency of up to cca 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 Frundlich adsorption isotherm. The adsorption free energy closes to – 10 kJ mol -1 indicates physical adsorption of the caffeine on the aluminium alloy surface in NaCl solution.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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