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Sulfathiazole as potential corrosion inhibitor for copper in 0.1 M NaCl

  • Physicochemical Problems of Materials Protection
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Abstract

Effects of sulfathiazole (ST) on copper corrosion as a corrosion inhibitor in 0.1 M NaCl solutions have been studied using potentiodynamic polarization, open circuit potential, electrochemical impedance spectroscopy with scanning electron microscopy (SEM). Potentiodynamic polarization measurements indicated that the presence of ST in chloride solutions affects mainly the cathodic process and decreases the corrosion current and shifts the corrosion potential towards more negative values. The adsorption of inhibitor on the copper surface obeys the Langmuir adsorption isotherm. The adsorption free energy of ST on copper (−33.47 kJ/mol) shows a strong adsorption of the inhibitor on the metal surface. The effect of temperature on the inhibition efficiency of sulfathiazole was examined with Arrhenius equation and activation energies in 0.1 M NaCl with and without inhibitor were calculated. Impedance data were analyzed using an appropriate equivalent circuit model for the electrode /electrolyte interface. SEM measurements also exhibited that the ST molecules are strongly adsorbed on the copper surface.

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Authors and Affiliations

  1. Kocaeli University Science Art Faculty Chemistry Department, 41380, Umuttepe, Kocaeli, Turkey

    Sibel Zor

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  1. Sibel Zor
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Zor, S. Sulfathiazole as potential corrosion inhibitor for copper in 0.1 M NaCl. Prot Met Phys Chem Surf 50, 530–537 (2014). https://doi.org/10.1134/S2070205114040200

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  • DOI: https://doi.org/10.1134/S2070205114040200

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