Cefadroxil Drug as Corrosion Inhibitor for Aluminum in 1 M HCl Medium: Experimental and Theoretical Studies
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 4
Abstract
the inhibition performance of Cefadroxil drug on Aluminum (Al) in 1 M hydrochloric acid solution was investigated in the temperature range of 298-318k and the concentration range of 0.02-2mm by weight loss and Tafel polarization method. The results show that Cefadroxil can inhibit the corrosive action of hydrochloric acid media. The maximum inhibition efficiency of 93.22% and 90.30% were observed in the presence of 2mM inhibitor in the case of weight loss and potentiodynamic polarization respectively. The adsorption of the studied inhibitor on the Aluminum was found to follow Langmuir adsorption model. Thermodynamic adsorption functions (βπΊπππ 0 , βπ»πππ 0 , βππππ 0 ) and the activation parameters (πΈπ , βπ»π β , βππ β ) were determined and analyzed. The results withdrawn from these parameters indicated spontaneous adsorption of the inhibitor on the metal surface and a strong interaction with the metallic surface. Tafel polarization showed that Cefadroxil behaves as mixed-type inhibitor. Surface analysis using Scanning Electron Microscopy (SEM) has confirmed the existence of a protective film of inhibitor molecules onto Al surface. Moreover, Density Functional Theory (DFT) calculations with 6-31G (d, p) basis set were carried out in order to elucidate adsorption and reactive sites of the inhibitor. The local reactivity has been analyzed through Mulliken population analysis. The obtained theoretical results are consistent with the experimental data.
Authors and Affiliations
DIKI Nβguessan Yao SilvΓ¨re, BOHOUSSOU Kouadio Valery, KONE Mamadou Guy- Richard, OUEDRAOGO Augustin, TROKOUREY Albert
Keywords
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- EP ID EP414033
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