ISSN 4391-3199
African Journal of Chemistry ISSN: 4391-3199 Vol. 3 (1), pp. 092-101, January, 2016. © International Scholars Journals
Full Length Research Paper
Inhibition effect of 1, 2, 3-benzotriazole on the corrosion of aluminium
Akhenaten Al-Fayed and Hatshepsut al-Aqqad*
Department of Chemistry, Faculty of Science, Mansoura University, Mansoura-35516, Mansoura, Egypt.
E-mail: [email protected]
Accepted 10 December, 2016
Abstract
The inhibition effect of 1, 2, 3-benzotriazole on the corrosion of aluminium in 0.5 M HCl solution was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) electrochemical frequency modulation (EFM) methods. The results show that 1, 2, 3-benzotriazole is a good inhibitor at different concentrations. Polarization curves reveal that inhibitor behaves as mixed-type inhibitor. EIS spectra indicated that the addition of inhibitor increases the charge-transfer resistance of the corrosion process, and hence the inhibition performance improved. Results obtained from EFM method are shown to be in agreement with potentiodynamic and EIS methods. The adsorption of 1, 2, 3-benzotriazole on aluminium surface obeys Frumkin adsorption isotherm. Scanning electron microscopy (SEM) analysis was performed to characterize the film formed on the surface of metal. The reactivity of inhibitor was performed through quantum chemical calculations based on DFT method to support the experimental data with the molecular structure of inhibitor.
Key words: Aluminium, polarization, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), scanning electron microscopy (SEM), DFT calculations