Corrosion Inhibition of Copper in Acid Media using Sparfloxacin – an Electrochemical Study
J. Environ. Nanotechnol., Volume 8, No 1 (2019) pp. 13-24
Abstract
The inhibitory efficacy of sparfloxacin on copper corrosion in acid solutions has been investigated using the potentio-dynamic polarisation method and electrochemical impedance spectroscopy. Sparfloxacin had a high inhibition effectiveness, and the inhibitory activity was mixed in nature but mainly cathodic in character. The mechanism of the inhibitor's adsorption onto the metal surface has been investigated using potential zero charge investigations. The activation energy (Ea) and thermodynamic parameters such as the adsorption equilibrium constant (Kads), the free energy of adsorption (ΔGads), S and H were estimated using the temperature-dependence of corrosion rates. The free energy of adsorption close to -40 kJmol-1 has indicated that the adsorption was through electrostatic coulombic attraction and chemisorption. Sparfloxacin molecules adhered to the Langmuir adsorption isotherm. The synergistic impact of KCl, KBr and KI has been studied and the inclusion of KI resulted in an increase in inhibitory efficiency owing to synergism.
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Reference
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