Electrochemical and Theoretical Investigation for the Protection of Aluminum Corrosion in Hydrochloric Acid using Some Azole Derivatives

Three compounds of azole derivatives were investigated as inhibitors for the dissolution of aluminum (Al) in 0.5 M HCl solution using electrochemical techniques, e.g., potentiodynamic polarization, electrochemical impedance spectroscopy electrochemical frequency modulation (EFM). The surface of Al w...

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Bibliographic Details
Published in:Protection of metals and physical chemistry of surfaces 2018-11, Vol.54 (6), p.1204-1212
Main Authors: Abdallah, M., Fouda, A. S., El-Nagar, D. A. M., Ghoneim, M. M.
Format: Article
Language:English
Subjects:
Adsorption
Aluminum
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion inhibitors
Corrosion prevention
Derivatives
Electrochemical impedance spectroscopy
Electrode polarization
Electron density
Frequency modulation
Hydrochloric acid
Imidazole
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Metallic Materials
Physicochemical Problems of Materials Protection
Scanning electron microscopy
Surface chemistry
Tafel slopes
Tribology
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Summary:Three compounds of azole derivatives were investigated as inhibitors for the dissolution of aluminum (Al) in 0.5 M HCl solution using electrochemical techniques, e.g., potentiodynamic polarization, electrochemical impedance spectroscopy electrochemical frequency modulation (EFM). The surface of Al was examined in the absence and presence of the some azole derivatives using scanning electron microscopy (SEM). The potentiodynamic polarization suggests that these compounds act as mixed type inhibitors because they enhance both the anodic and cathodic Tafel slopes. The inhibition efficiency (%IE), increased with increasing the concentration of inhibitors. SEM proved the surface of Al is improved due to the adsorption of the azole compounds on the surface of Al. The adsorption of the azole compounds on the Al surface is obeyed Frumkin isotherm. The sequence of the %IE increases in the following order 1,2,3-benztriazole > methyl imidazole > imidazole. The extent of inhibition depends on the molecular size of the molecule and the electron density of the substituent groups.
ISSN:2070-2051
2070-206X
DOI:10.1134/S2070205118060023