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Zainab W. Ahmed
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Medicine & Pharmacology

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Corrosion Inhibition of Copper by Olive Leaves Extract as Environmentally Friendly Inhibitors in Acidic Media Zainab W. Ahmed
Journal of Global Pharma Technology Volume 11 Issue 09: (2019) September 2019
Publisher : Journal of Global Pharma Technology

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Abstract

An inhibition effect of olive leaves extract in corrosion of copper alloy in hydrochloric acid solution was studied by means of potentiodynamic polarization and scanning electron microscopy (SEM). The inhibition efficiency has as inhibitor concentration increased but decreased with increase in temperature. Fallouts have depicted that the inhibition takes place throughout adsorbing inhibitor molecules on the metal surface that agrees with Langmuir adsorption isotherm. Several thermodynamic parameters 14∆Gads." style="width: 41.25pt; height: 15pt;"> in addition to activation energy 14Ea" style="width: 22.5pt; height: 15pt;"> have been determined to explain the process of corrosion inhibition. The measurements of polarization indicated that olive leaves extract is of cathodic type. The surface characteristic of the inhibited and uninhibited metal tasters have examined by SEM.       Keywords: Corrosion inhibition, copper, olive leaves extract, Adsorption Mechanism thermodynamic parameters.
Serine and Alanine as Corrosion Inhibitors for 5083 AA in Aqueous Solutions Zainab W. Ahmed
Journal of Global Pharma Technology Volume 11 Issue 05.
Publisher : Journal of Global Pharma Technology

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Abstract

By means of potentiodynamic polarization methods, inhibiting the influence of serine and alanine on 5083 AA corrosion in 0.1 mol.dm-3 sodium hydroxide and 140.6 mol. dm-3 NaCl">  over temperature range (298-313) K was investigated. Potentiodynamic polarization results specified that these amino acids functioned as a functional inhibitor in an alkaline environment. The inhibiting efficiency raises as the inhibitor concentration raises. However, it drops as temperature rises. The maximum efficiency value found with alanine was 73 under 298 k and 1410-2 mol. dm-3">  alanine concentration. The adsorption of the amino acids complies with Langmuir adsorption isotherm. Some thermodynamic parameter 14∆Gads">  and activation energy 14Ea">  have been computed to demonstrate the process of corrosion inhibition. The kinetic limitations have been evaluated by means of Arrhenius theorem. An appropriate mechanism has projected for 5083 AA corrosion in alkaline medium. The surface morphology of uninhibited and inhibited samples was investigated using an optical microscope.Keyword: Corrosion inhibition, 5083AA, Amino acids, Free energy of adsorption, Adsorption mechanism.
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