Documents disponibles écrits par cet auteur

The co-operative effect of chloride ions and some natural extracts in retarding corrosion of steel in neutral media / A. M. Abdel-Gaber in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 161–167 Titre : The co-operative effect of chloride ions and some natural extracts in retarding corrosion of steel in neutral media Type de document : texte imprimé Auteurs : A. M. Abdel-Gaber, Auteur ; B. A. Abdel-Nabey, Auteur ; M. Saadawy, Auteur Année de publication : 2012 Article en page(s) : pp. 161–167 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  neutral  extract;  steel Résumé : Effect of lupine and damsissa extracts on the corrosion of steel in 0.5 M Na2SO4 solution free from and containing 0.01 or 0.1 M NaCl were examined by potentiodynamic and electrochemical impedance spectroscopy techniques. Potentiodynamic polarization curves measurements indicated that damsissa and lupine extracts behave as anodic type inhibitors. Nyquist impedance plots showed type of distorted semicircle whose size increases with increasing concentrations of lupine or damsissa extract. Increasing chloride ion concentration in the solution led to increase of the inhibition efficiency of the extract and this behaviour was explained on the basis of co-operative mechanism of adsorption. Kinetic–thermodynamic model was used to clarify the nature of adsorption and showed good fit to the experimental data. The results indicated that lupine extract is more effective as corrosion inhibitor for steel in neutral media containing chloride ions than damsissa extract. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005678/abstract [article] The co-operative effect of chloride ions and some natural extracts in retarding corrosion of steel in neutral media [texte imprimé] / A. M. Abdel-Gaber, Auteur ; B. A. Abdel-Nabey, Auteur ; M. Saadawy, Auteur . - 2012 . - pp. 161–167. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 161–167 Mots-clés : Corrosion;  neutral  extract;  steel Résumé : Effect of lupine and damsissa extracts on the corrosion of steel in 0.5 M Na2SO4 solution free from and containing 0.01 or 0.1 M NaCl were examined by potentiodynamic and electrochemical impedance spectroscopy techniques. Potentiodynamic polarization curves measurements indicated that damsissa and lupine extracts behave as anodic type inhibitors. Nyquist impedance plots showed type of distorted semicircle whose size increases with increasing concentrations of lupine or damsissa extract. Increasing chloride ion concentration in the solution led to increase of the inhibition efficiency of the extract and this behaviour was explained on the basis of co-operative mechanism of adsorption. Kinetic–thermodynamic model was used to clarify the nature of adsorption and showed good fit to the experimental data. The results indicated that lupine extract is more effective as corrosion inhibitor for steel in neutral media containing chloride ions than damsissa extract. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005678/abstract

Utilizing Arghel extract as corrosion inhibitor for reinforced steel in concrete / A. M. Abdel-Gaber in Materials and corrosion, Vol. 62 N° 12 (Décembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1159–1162 Titre : Utilizing Arghel extract as corrosion inhibitor for reinforced steel in concrete Type de document : texte imprimé Auteurs : A. M. Abdel-Gaber, Auteur ; E. Khamis, Auteur ; A. Hefnawy, Auteur Année de publication : 2012 Article en page(s) : pp. 1159–1162 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Arghel  Concrete  Corrosion  Extract  Inhibitor  Steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Inhibition of the corrosion of reinforced steel in concrete in 0.5 M NaCl by Arghel extract has been studied employing different electrochemical techniques in conjunction with optical images photo. Potential-time measurements showed that introducing of Arghel extract into concrete shifts the potential of reinforced steel to more positive values. Potentiodynamic polarization curves measurements manifested that Arghel extract acts as anodic type inhibitor. Nyquist plots were characterized by a distinct charge transfer and diffusion components. A proposed equivalent circuit was used to analyze the impedance spectra of reinforced steel in concrete in 0.5 M NaCl. Optical images for the cracked lollipops samples of the reinforced steel in concrete that is immersed in 0.5 M NaCl for 18 months showed no corrosion attack even in the presence of a low concentration of Arghel which is in good agreement with the results obtained from the electrochemical techniques. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005653/abstract [article] Utilizing Arghel extract as corrosion inhibitor for reinforced steel in concrete [texte imprimé] / A. M. Abdel-Gaber, Auteur ; E. Khamis, Auteur ; A. Hefnawy, Auteur . - 2012 . - pp. 1159–1162. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1159–1162 Mots-clés : Arghel  Concrete  Corrosion  Extract  Inhibitor  Steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Inhibition of the corrosion of reinforced steel in concrete in 0.5 M NaCl by Arghel extract has been studied employing different electrochemical techniques in conjunction with optical images photo. Potential-time measurements showed that introducing of Arghel extract into concrete shifts the potential of reinforced steel to more positive values. Potentiodynamic polarization curves measurements manifested that Arghel extract acts as anodic type inhibitor. Nyquist plots were characterized by a distinct charge transfer and diffusion components. A proposed equivalent circuit was used to analyze the impedance spectra of reinforced steel in concrete in 0.5 M NaCl. Optical images for the cracked lollipops samples of the reinforced steel in concrete that is immersed in 0.5 M NaCl for 18 months showed no corrosion attack even in the presence of a low concentration of Arghel which is in good agreement with the results obtained from the electrochemical techniques. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005653/abstract