European Journal of Chemistry

Some pyrazole derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solutions

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Published: Sep 30, 2015
DOI: https://doi.org/10.5155/eurjchem.6.3.342-349.1279
Keywords:
Pyrazole, Steel surface, Carbon steel, Corrosion inhibitor, Langmuir isotherm, Pyrazole derivatives
Section
Research Article
Issue
Vol. 6 No. 3 (2015): September 2015
Dates
Received 2015-06-07
Accepted 2015-07-05
Published 2015-09-30


Main Article Content

Mohamed Sobhi Motawea
Department of Chemistry, Faculty of Science, Benha University, Benha, Qalubya, 13518, Egypt
Mahmoud Ali Abdelaziz
Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, 7149, Saudi Arabia

Abstract

Two pyrazole derivatives, namely 2,4-diamino-5-(5-amino-3-hydroxy-1H-pyrazole-1-carbonyl)thiophene-3-carbonitrile (I) and 1-(2,4-diamino-5-(5-amino-3-hydroxy-1H-pyrazole-1-carbonyl)thiophen-3-yl)propan-1-one (II) were evaluated as a corrosion inhibitors for carbon steel in 1M hydrochloric acid by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy methods. Spectrophotometric and conductometric titration methods were also utilized to investigate the possibilities of chemical adsorption between the steel surface and the compounds under consideration. The results showed that the studied compounds inhibit the corrosion of steel in acidic solution at different temperatures. The adsorption followed the Langmuir isotherm. The thermodynamic and the activation parameters were also determined and discussed.


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Motawea, M. S.; Abdelaziz, M. A. Some Pyrazole Derivatives As Corrosion Inhibitors for Carbon Steel in Hydrochloric Acid Solutions. Eur. J. Chem. 2015, 6, 342-349.

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