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El Arouji S.,Laboratoire Dingenierie Delectrochimie Of Modelisation Et Denvironnement Lieme Fsdm Fes | Alaoui Ismaili K.,Laboratoire Dingenierie Delectrochimie Of Modelisation Et Denvironnement Lieme Fsdm Fes | Zerrouki A.,Mohammed first University | El Kadiri S.,Mohammed first University | And 7 more authors.
Der Pharma Chemica | Year: 2015

The corrosion inhibition of mild steel in 0.5 M H2SO4 using ethyl 1-(((4-acetylphenyl)((3-(ethoxycarbonyl)-1Hpyrazol- 1-yl)methyl)amino)methyl)-5-methyl-1H-pyrazole-3-carboxylate (APC) at 298 K have been investigated. The study was performed using weight loss method, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The experimental results suggest that the inhibition efficiency of this compound increases with the increase in inhibitor concentration. Adsorption of this compound on mild steel surface obeys Langmuir's isotherm. Polarization measurements proved that this inhibitor behave as mixed type. EIS data showed that the charge transfer resistance of mild steel increases in acid solution containing inhibitor. Correlation between quantum chemical calculations and inhibition efficiency of the investigated compound is discussed using the Density Functional Theory method (DFT). Source


Alaoui Ismaili K.,Laboratoire Dingenierie Delectrochimie Of Modelisation Et Denvironnement Lieme Fsdm Fes | El Arouji S.,Laboratoire Dingenierie Delectrochimie Of Modelisation Et Denvironnement Lieme Fsdm Fes | Abdellaoui A.,Pharmacology Health and Environment Unit of Bioremediation and Environment | El Kamani F.,Pharmacology Health and Environment Unit of Bioremediation and Environment | And 7 more authors.
Der Pharma Chemica | Year: 2015

Corrosion inhibition effect of cymbopogon nardus essential oil (CNEO) on the mild steel in 1.0 M HCl solution was investigated by electrochemical (potentiodynamic polarization curves, and electrochemical impedance spectroscopy) and weight loss techniques. The corrosion rate of mild steel was decreased in the presence of CNEO. The corrosion inhibition efficiency was found to increase with CNEO concentration to attain 90% with 1.50 g/L at K. The polarization studies showed that CNEO acts as mixed type inhibitor. The effect of temperature on the corrosion rate of mild steel in HCl solution in the absence and presence of CNEO was also studied. Values of corrosion inhibition efficiency calculated from weight loss technique were in good agreement with those obtained from electrochemical techniques. The results showed that the adsorption of the cymbopogon nardus essential oil (CNEO) on the mild steel surface obeys Langmuir isotherm. The activation parameters, apparent activation energy (Ea), the enthalpy of activation (ΔHa) and entropy of activation (ΔSa) for the corrosion of mild steel in 1.0 M HCl in the absence and presence of CNEO were calculated and discussed. Source

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