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oai:ojs.www.eurjchem.com:article/1279 2015-09-30T05:16:04Z eurjchem:ART driver

Some pyrazole derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solutions Motawea, Mohamed Sobhi Abdelaziz, Mahmoud Ali Pyrazole Steel surface Carbon steel Corrosion inhibitor Langmuir isotherm Pyrazole derivatives 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. Atlanta Publishing House LLC 2015-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1279 10.5155/eurjchem.6.3.342-349.1279 European Journal of Chemistry; Vol. 6 No. 3 (2015): September 2015; 342-349 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1279/pdf_1279