Experimental and theoretical investigation of 3-amino-1,2,4-triazole-5-thiol as a corrosion inhibitor for carbon steel in HCl medium

• Published in: Corrosion science Vol. 53; no. 12; pp. 4265 - 4272
• Main Authors: Mert, Başak Doğru, Erman Mert, M., Kardaş, Gülfeza, Yazıcı, Birgül
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2011; Elsevier
• Subjects: A. Steel; Applied sciences; B. EIS; B. Electrochemical calculation; C. Acid corrosion; Carbon steels; Computational efficiency; Computing time; Corrosion; Corrosion environments; Corrosion inhibitors; Corrosion prevention; Dipole moment; Exact sciences and technology; Inhibition; Mathematical analysis; Metals. Metallurgy; Surface chemistry; B. EIS; A. Steel; B. Electrochemical calculation; C. Acid corrosion; Hydrochloric acid; Thiol; Acid corrosion; Carbon steel; Calculation; Impedance; Corrosion protection; Corrosion inhibitor
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2011.08.038

► The effect of 3-amino-1,2,4-triazole-5-thiol (3ATA5T) on carbon steel corrosion in 0.5 M HCl was investigated. ► The high inhibition efficiency was determined, which attributed to the adherent adsorption of the 3ATA5T. ► Langmuir adsorption isotherm exhibited the best fit to the experimental data. ► Quantum chemical calculations show there is a correlation between inhibitive property and molecular parameters. The inhibition effect of 3-amino-1,2,4-triazole-5-thiol (3ATA5T) was investigated in 0.5 M HCl on carbon steel (CS) by electrochemical impedance spectroscopy and potentiodynamic measurements at various concentrations and temperatures. Results showed that the correlation between experimental (inhibition efficiencies, Δ G ads , E a ) and quantum calculation parameters (dipole moment, E HOMO , E LUMO ). The high inhibition efficiency was declined in terms of strongly adsorption of protonated inhibitor molecules on the metal surface and forming a protective film.