Abstract
The efficiency of chitosan (a naturally occurring polymer) as a corrosion inhibitor for mild steel in 0.1 M HCl was investigated by gravimetric, potentiodynamic polarization, electrochemical impedance spectroscopy measurements, scanning electron microscopy, and UV–visible analysis. The polymer was found to inhibit corrosion even at a very low concentration. Inhibition efficiency increases with a rise in temperature up to 96 % at 60 °C and then drops to 93 % at 70 °C, while it slightly increases with an increase in chitosan concentration. Polarization curves indicate that chitosan functions as a mixed inhibitor, affecting both cathodic and anodic partial reactions. Impedance results indicate that chitosan was adsorbed on the metal/solution interface. Adsorption of chitosan at the mild steel surface is found to be in agreement with Langmuir adsorption isotherm model. Chemical adsorption is the proposed mechanism for corrosion inhibition considering the trend of protection efficiency with temperature. Calculated kinetic and thermodynamic parameters corroborate the proposed mechanism.
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Acknowledgments
S. A. Umoren acknowledges the Academy of Sciences for the Developing World (TWAS) for the TWAS-UNESCO Associateship appointment at INIFTA, CONICET Argentina and the Vice Chancellor, University of Uyo, Nigeria for granting Special Leave to visit INIFTA, Argentina, C.A. Gervasi gratefully acknowledges the Comisión de Investigaciones Científicas y Técnicas Buenos Aires (CICBA) for his position as a member of the Carrera del Investigador Científico. This work was partially financed with a grant from Agencia Nacional de Promoción Científica y Tecnológica (PICT Nº 2008-1902), and M.V.Mirífico gratefully acknowledges the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET-CCT LP) (PIP 0847), Universidad Nacional de La Plata (UNLP), and Facultad de Ingeniería UNLP, Área Departamental de Ingeniería Química (11-I133).
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Umoren, S.A., Banera, M.J., Alonso-Garcia, T. et al. Inhibition of mild steel corrosion in HCl solution using chitosan. Cellulose 20, 2529–2545 (2013). https://doi.org/10.1007/s10570-013-0021-5
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DOI: https://doi.org/10.1007/s10570-013-0021-5