Aluminum corrosion inhibition by cefixime drug: experimental and DFT studies

N’Guessan Yao Silvere Diki,Augustin Ouedraogo,Gildas K Gbassi,Albert Trokourey,Mohamed Berte

doi:10.5599/jese.549

N’Guessan Yao Silvere Diki, Augustin Ouedraogo + Show 3 more

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https://doi.org/10.5599/jese.549

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Abstract

<div><p><em>Corrosion inhibition of aluminum (Al) in 1 M HCl by cefixime drug has been studied at 298-318 K using mass loss , Tafel polarization (at 298 K) and quantum chemical methods based on density functional theory (DFT) calculations. The results showed that inhibition efficiency increases up to 90.41 % with increase of the inhibitor concentration from 0.02 to 2 mM, but decreases with a rise of the solution temperature. Adsorption of cefixime molecules on the corroding aluminium surface obeys Langmuir adsorption isotherm and occurs spontaneously mostly through a physisorption process. The activation energy (</em><em>) as well as other thermodynamic parameters of the inhibition process are calculated and discussed. Potentiodynamic polarization data revealed that cefixime acts as mixed-type inhibitor and pointed out an agreement with mass loss results. Surface analysis is performed using Scanning Electron Microscopy (SEM) which confirmed existence of a protective film of inhibitor molecules on the aluminum surface. In addition, global and local reactivity parameters of the studied molecule are analyzed and discussed. The computed results are found in agreement with experimental data.</em></p></div>

Highlights

Corrosion of metals is a major industrial, economical and safety concern that has focused many investigations and researches [1,2,3]
The curves showed that corrosion rate of aluminum in the studied medium increases with increasing temperature, but this rise becomes moderate for higher concentrations of cefixime
For the temperature range studied, inhibition efficiency (IE) increases with increase of the inhibitor concentration, until a value of 90.41 % is attained for the concentration of 2 mM at 298 K

Summary

Introduction

Corrosion of metals is a major industrial, economical and safety concern that has focused many investigations and researches [1,2,3]. The Fukui functions were used to analyze the local reactivity of cefixime as a corrosion inhibitor of aluminum.

Results

Conclusion