European Journal of Chemistry 2015, 6(3), 342-349 | doi: https://doi.org/10.5155/eurjchem.6.3.342-349.1279 | Get rights and content






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


Mohamed Sobhi Motawea (1,*) , Mahmoud Ali Abdelaziz (2)

(1) Department of Chemistry, Faculty of Science, Benha University, Benha, Qalubya, 13518, Egypt
(2) Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk, 7149, Saudi Arabia
(*) Corresponding Author

Received: 07 Jun 2015 | Accepted: 05 Jul 2015 | Published: 30 Sep 2015 | Issue Date: September 2015

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.


Keywords


Pyrazole; Steel surface; Carbon steel; Corrosion inhibitor; Langmuir isotherm; Pyrazole derivatives

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DOI: 10.5155/eurjchem.6.3.342-349.1279

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[1]. Ambrish Singh, K.R. Ansari, Dheeraj Singh Chauhan, M.A. Quraishi, H. Lgaz, Ill-Min Chung
Comprehensive investigation of steel corrosion inhibition at macro/micro level by ecofriendly green corrosion inhibitor in 15% HCl medium
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[2]. M. Abdallah, M. Sobhi, H.M. Altass
Corrosion inhibition of aluminum in hydrochloric acid by pyrazinamide derivatives
Journal of Molecular Liquids  223, 1143, 2016
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How to cite


Motawea, M.; Abdelaziz, M. Eur. J. Chem. 2015, 6(3), 342-349. doi:10.5155/eurjchem.6.3.342-349.1279
Motawea, M.; Abdelaziz, M. Some pyrazole derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solutions. Eur. J. Chem. 2015, 6(3), 342-349. doi:10.5155/eurjchem.6.3.342-349.1279
Motawea, M., & Abdelaziz, M. (2015). Some pyrazole derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solutions. European Journal of Chemistry, 6(3), 342-349. doi:10.5155/eurjchem.6.3.342-349.1279
Motawea, Mohamed, & Mahmoud Ali Abdelaziz. "Some pyrazole derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solutions." European Journal of Chemistry [Online], 6.3 (2015): 342-349. Web. 3 Jul. 2020
Motawea, Mohamed, AND Abdelaziz, Mahmoud. "Some pyrazole derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solutions" European Journal of Chemistry [Online], Volume 6 Number 3 (30 September 2015)

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DOI Link: https://doi.org/10.5155/eurjchem.6.3.342-349.1279

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