Experimental and Quantum Chemical Studies of the Inhibition of Copper with Sodium Dodecyl Sulphate (SDS) in Acidic Medium
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Scientific Research Publishing
Abstract
This work investigates the inhibitive properties of sodium dodecyl sulphate
(SDS) on the corrosion of copper (Cu) in nitric acid using gasometric methods.
The inhibition efficiency increases with time and concentration of
SDS. The corrosion rate of copper decreases as concentration of SDS increases.
Adsorption of the SDS on the surface obeyed the Langmuir adsorption
isotherm. The high negative values of the kinetic parameter B suggest
that the inhibitor’s effectiveness increases with temperature. The equilibrium
constant and the free energy of adsorption of SDS to copper are negative and
large. This observation implies that the adsorption mechanism maybe chemisorption.
The quantum chemical calculation of copper dodecyl sulphate
shows that the energy change in the HOMO-LUMO energy of the moiety is
positive and small. This observation implies that the SDS is an efficient inhibitor.
The high dipole moment obtained implies that corrosion inhibition of
Cu is enhanced by adsorption of SDS and this observation correlates with the
observed experimental inhibition efficiency
Description
Staff Publication
Keywords
Corrosion Inhibition,, Copper,, Gasometric Methods,, Adsorption,, Inhibition Efficiency,, Sodium Dodecyl Sulphate (SDS)
Citation
Nkiko, M.O., Oluwabi, A., Ahmed, S.A. and Bamgbose, J.T. (2018) Experimental and Quantum Chemical Studies of the Inhibition of Copper with Sodium Dodecyl Sulphate (SDS) in Acidic Medium. Engineering, 10, 851-862. https://doi.org/10.4236/eng.2018.1012059