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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
The inhibitive effect of some tetrazole derivatives towards Al corrosion in acid solution: Chemical, electrochemical and theoretical studies
Materials Chemistry and Physics, Volume 113, No. 1, Year 2009
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Description
Corrosion inhibition of aluminum in 1.0 M HCl was investigated in the absence and presence of different concentrations of tetrazole derivatives namely, 1-phenyl-1H-tetrazole-5-thiol (A), 1-phenyl-1H-tetrazole (B), 1H-tetrazol-5-amine (C), 1H-tetrazole (D). Weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements were employed. Impedance measurements showed that the charge transfer resistance increased and double layer capacitance decreased with increase in the inhibitor's concentration. Potentiodynamic polarization study showed that the inhibitors acted as cathodic-type inhibitors. Also, results obtained reveal that compound A is the best inhibitor and the inhibition efficiency (IE%) follows the sequence: A > B > C > D. Obvious correlations were found between corrosion inhibition efficiency and some quantum chemical parameters such as energy of highest occupied molecular orbital (HOMO), energy of lowest unoccupied molecular orbital (LUMO), HOMO-LUMO energy gap and electronic density etc. Calculated results indicated that the difference in inhibition efficiencies between these compounds can be clearly explained in terms of frontier molecular orbital theory. The inhibitor performance depends mainly on the type of function groups substituted on tetrazole ring. The adsorption of these compounds on the aluminum surface obeys a Langmuir adsorption isotherm and has a mixed physisorption and chemisorption mechanism. © 2008 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Khaled, Khaled F.
Egypt, Cairo
College of Science
Saudi Arabia, Taif
Taif University
Al-Qahtani, M. M.
Saudi Arabia, Taif
Taif University
Statistics
Citations: 291
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1016/j.matchemphys.2008.07.060
ISSN:
02540584