Weight loss, polarization, electrochemical impedance spectroscopy, SEM and EDX studies of the corrosion inhibition of copper in aerated NaCl solutions |
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Authors: | Mohammed A Amin |
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Affiliation: | (1) Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt |
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Abstract: | This work reports results of weight loss, potentiodynamic polarization and impedance measurements on the corrosion inhibition
of copper in aerated non-stirred 3% NaCl solutions in the temperature range 15–65 °C using sodium oleate (SO) as an anionic
surfactant inhibitor. These studies have shown that SO is a very good ”green”, mixed-type inhibitor. The inhibition process
was attributed to the formation of an adsorbed film on the metal surface that protects the metal against corrosive agents.
Scanning electron microscopy (SEM) and energy dispersion X-ray (EDX) observations of the electrode surface confirmed the existence
of such an adsorbed film. The inhibition efficiency increases with increasing surfactant concentration and time of immersion,
while it decreases with solution temperature. Maximum inhibition efficiency of the surfactant is observed at concentrations
around its critical micellar concentration (CMC). The potential of zero charge (pzc) of copper was studied by ac impedance,
and the mechanism of adsorption is discussed. The sigmoidal shape of the adsorption isotherm confirms the applicability of
Frumkin’s equation to describe the adsorption process. Thermodynamic functions for the adsorption process were determined. |
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Keywords: | anionic surfactant adsorption copper corrosion inhibition EIS NaCl solution |
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