Temperature Effect, Activation Energies and Thermodynamic Adsorption Studies of L-Cysteine Methyl Ester Hydrochloride As Copper Corrosion Inhibitor In Nitric Acid 2M

The inhibition of L-Cysteine Methyl Ester Hydrochloride (L-CMEH) on the corrosion of copper in 2M HNO3, was studied by gravimetric method, in the range of temperatures from 303 to 343 K. Results obtained show that L-CMEH acts as inhibitor for copper in HNO3 solution. The inhibition efficiency was fo...

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Bibliographic Details
Published inInternational journal of electrochemical science Vol. 6; no. 12; pp. 6261 - 6274
Main Authors Zarrouk, A., Hammouti, B., Zarrok, H., Al-Deyab, S.S., Messali, M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2011
Subjects
Adsorption
Copper
Corrosion
Cysteine
Inhibition
Nitric Acid
Thermodynamics
Thermodynamics
Cysteine
Corrosion
Adsorption
Inhibition
Copper
Nitric Acid
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Summary:The inhibition of L-Cysteine Methyl Ester Hydrochloride (L-CMEH) on the corrosion of copper in 2M HNO3, was studied by gravimetric method, in the range of temperatures from 303 to 343 K. Results obtained show that L-CMEH acts as inhibitor for copper in HNO3 solution. The inhibition efficiency was found to increase with increase in L-CMEH concentration but decreased with temperature. The inhibition was assumed to occur via adsorption of the L-Cysteine Methyl Ester Hydrochloride on the metal surface. The adsorption of L-CMEH onto the copper surface was found to follow the Langmuir adsorption isotherm. Both kinetic parameters (activation energy, pre-exponential factor, enthalpy of activation and entropy of activation) and thermodynamics of adsorption (enthalpy of adsorption, entropy of adsorption and Gibbs free energy) were calculated and discussed.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)19679-9