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Corrosion Protection of Zinc in Natural Sea Water using Citrullus Vulgaris peel as an Inhibitor

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Author Affiliations

  • 1 PG and Research Department of Chemistry, Sri Paramakalyani College, Alwarkurichi-627412, Tamil Nadu, India

Res.J.chem.sci., Volume 2, Issue (4), Pages 24-34, April,18 (2012)

Abstract

The effect of Citrullus Vulgaris peel on the corrosion of zinc in natural sea water has been studied by mass loss measurements at different time and temperature. The present investigation revealed that the percentage of inhibition efficiency is increased with increase of inhibitor concentration and decreased with rise in period of contact. The temperature studies reflect that the percentage of inhibition efficiency is decreased with increase of temperature and it indicates that the mechanism of physical adsorption. The calculated values of activation energy (Ea) also support the physisorption process. The thermodynamic parameters such as heat of adsorption (Qads) and free energy of adsorption (∆G ads) are suggested that the adsorption of inhibitor on the zinc metal surface is exothermic and followed by spontaneous process. Experimental data has fitted with the Langmuir and Temkin adsorption isotherm. The corrosion products on the metal surface in the presence and absence of inhibitor is analysed by FTIR and XRD studies. The rich of main compounds namely zinc oxide (ZnO) and Pottasium diaquatrichlorozincate(II) (K [ZnCl3(H2 O)2]) are formed on the metal surface may be confirmed by XRD spectrum. The observed results concluded that the Citrullus Vulgaris peel could serve as an effective inhibitor on zinc in natural sea water environment.

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