The inhibition effect of amides on aluminium corrosion in chloride solutions
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The inhibition effect of different concentrations of benzamide (BA), sulfanilamide (SA), and thioacetamide (TA) on the corrosion of aluminium in 0.1 M NaCl solution was investigated by the methods of potentiodynamic polarization, electrochemical impedance spectroscopy, and SEM (scanning electron microscope) in this study. Impedance measurements showed that the charge transfer resistance increased whereas double layer capacitance decreased with the increase in the inhibitor concentrations. Adsorption of these inhibitors followed the Langmuir adsorption isotherm. Thermodynamic parameters of adsorption (K ads , ΔG ads ) of studied amides were calculated by using Langmiur adsorption isotherm. The surface films of the aluminium, both in solutions with and without the inhibitors, were then investigated by SEM. The results obtained showed that thioacetamide was much more effective in aluminium inhibition.
KeywordsCharge Transfer Resistance Potentiodynamic Polarization Polarization Resistance Benzamide Double Layer Capacitance
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- 3.Zor, S., Dogan, P., and Yazıcı, B., Corr. Rev., 2005, vol. 23, p. 217.Google Scholar