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Inhibition of mild steel corrosion in hydrochloric acid solution by triazole derivatives - Part I. Polarization and EIS studies
Faculty
Science
Year:
2007
Type of Publication:
Article
Pages:
6359-6366
Authors:
Hassan, Hamdy H, Abdelghani, Essam, Amin, Mohammed A
DOI:
10.1016/j.electacta.2007.04.046
Journal:
ELECTROCHIMICA ACTA PERGAMON-ELSEVIER SCIENCE LTD
Volume:
52
Research Area:
Electrochemistry
ISSN
ISI:000247834800008
Keywords :
mild steel, triazoles, potential of zero charge, EIS, corrosion inhibition
Abstract:
A comparative study of 5-amino-1,2,4-triazole (5-ATA), 5-amino-3-mercapto-1,2,4-triazole (5-AMT), 5-amino-3-methylthio-1,2,4-triazole (5AMeTT) and 1-amino-3-methylthio-1,2,4-triazole (1-AMeTT) as inhibitors for mild steel corrosion in 0.1 M HCl solution at 20 C was carried out. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were applied to study the metal corrosion behaviour in the absence and presence of different concentrations of these inhibitors under the influence of various experimental conditions. Measurements of open circuit potential (OCP) as a function of time till reaching the steady-state potentials (E-st) were also established. The studies have shown that 5-AMT was the most efficient inhibitor reaching values of inhibition efficiency (IE\%) up to 96\% at a concentration of 10(-3) M. Polarization curves showed that the four studied compounds act as mixed inhibitors. The potential of zero charge (PZC) of mild steel was determined in 0.1 M HCl in the absence and presence of the studied inhibitors. The effect of chemical structure of the four tested inhibitors was discussed. Results obtained from OCP versus time, polarization and impedance measurements are in good agreement. (c) 2007 Elsevier Ltd. All rights reserved.
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