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Chemical and physical interactions of 1 - benzoyl - 3,3 - disubstituted thiourea derivatives on mild steel surface / Mayakrishnan Gopiraman in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7910-7922 Titre : Chemical and physical interactions of 1 - benzoyl - 3,3 - disubstituted thiourea derivatives on mild steel surface : Corrosion inhibition in acidic media Type de document : texte imprimé Auteurs : Mayakrishnan Gopiraman, Auteur ; Nagamani Selvakumaran, Auteur ; Devarayan Kesavan, Auteur Année de publication : 2012 Article en page(s) : pp. 7910-7922 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Corrosion  inhibition  Mild  steel Résumé : 1-Benzoyl-3,3-diphenylthiourea (1), 1-benzoyl-3,3-dibenzylthiourea (2), 1-benzoyl-3,3-diethylthiourea (3), 1-benzoyl-3,3-dibutylthiourea (4), 1-benzoyl-3,3-bis(2-methylpropyl)thiourea (5), and 1-benzoyl-3,3-bis(propan-2-yl)thiourea (6) were synthesized and investigated as inhibitors for the corrosion of the surface of mild steel in 1.0 M HCl by chemical and electrochemical measurements. The inhibition efficiencies obtained from different methods were in good agreement with each other. Inhibitor 2 showed a higher inhibition efficiency according to all of the methods. The Tafel polarization method revealed the mixed-mode inhibition of inhibitors with predominant control of the anodic reaction. At all studied temperatures, the adsorption of the inhibitor molecules onto the steel surface was found to follow the Langmuir adsorption isotherm. The values of the Gibbs free energy of adsorption strongly supported spontaneous chemical and/or physical adsorption of inhibitor molecules. The adsorption mechanism for inhibition was supported by ultraviolet-visible (UV-vis), Fourier transform infrared (FTIR), Raman, and scanning electron microscopy-energy-dispersive X-ray (SEM-EDS) spectroscopic methods, and adsorption isotherm measurements. The crystalline/amorphous nature of the inhibitors adsorbed onto the mild steel surface was indicated by wide-angle X-ray diffraction (WAXD) analysis. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990305 [article] Chemical and physical interactions of 1 - benzoyl - 3,3 - disubstituted thiourea derivatives on mild steel surface : Corrosion inhibition in acidic media [texte imprimé] / Mayakrishnan Gopiraman, Auteur ; Nagamani Selvakumaran, Auteur ; Devarayan Kesavan, Auteur . - 2012 . - pp. 7910-7922. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7910-7922 Mots-clés : Corrosion  inhibition  Mild  steel Résumé : 1-Benzoyl-3,3-diphenylthiourea (1), 1-benzoyl-3,3-dibenzylthiourea (2), 1-benzoyl-3,3-diethylthiourea (3), 1-benzoyl-3,3-dibutylthiourea (4), 1-benzoyl-3,3-bis(2-methylpropyl)thiourea (5), and 1-benzoyl-3,3-bis(propan-2-yl)thiourea (6) were synthesized and investigated as inhibitors for the corrosion of the surface of mild steel in 1.0 M HCl by chemical and electrochemical measurements. The inhibition efficiencies obtained from different methods were in good agreement with each other. Inhibitor 2 showed a higher inhibition efficiency according to all of the methods. The Tafel polarization method revealed the mixed-mode inhibition of inhibitors with predominant control of the anodic reaction. At all studied temperatures, the adsorption of the inhibitor molecules onto the steel surface was found to follow the Langmuir adsorption isotherm. The values of the Gibbs free energy of adsorption strongly supported spontaneous chemical and/or physical adsorption of inhibitor molecules. The adsorption mechanism for inhibition was supported by ultraviolet-visible (UV-vis), Fourier transform infrared (FTIR), Raman, and scanning electron microscopy-energy-dispersive X-ray (SEM-EDS) spectroscopic methods, and adsorption isotherm measurements. The crystalline/amorphous nature of the inhibitors adsorbed onto the mild steel surface was indicated by wide-angle X-ray diffraction (WAXD) analysis. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990305