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The corrosion behavior of carbon steel in CO2-saturated NaCl crevice solution containing acetic acid / Q. Hu in Materials and corrosion, Vol. 63 N° 8 (Août 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 720–728 Titre : The corrosion behavior of carbon steel in CO2-saturated NaCl crevice solution containing acetic acid Type de document : texte imprimé Auteurs : Q. Hu, Auteur ; X. Guo, Auteur ; G. Zhang, Auteur Année de publication : 2013 Article en page(s) : pp. 720–728 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Carbon  steel;  crevice  corrosion;  electrochemical  noise;  electrochemical  impedance  spectroscopy Résumé : The corrosion behavior of X52 carbon steel electrodes in CO2-saturated NaCl crevice solution containing HAc was investigated by electrochemical measurements. Chemical environment measurements by Cl− and pH microprobes show an enrichment of Cl− ions and an increase of pH values inside the crevice. Moreover, both increments could accelerate with the decreasing dimension of the crevice mouth due to the high diffusive resistance. When the electrode in the crevice solution is coupled with the electrode in bulk solution, the alkalization and the enrichment of Cl− ions in the crevice solution can result in a negative shift of potential of the electrode in crevice solution, while the potential of the electrode in bulk solution shifts positively during the corrosion process. Thus, a galvanic corrosion is established with the electrode in the crevice solution acting as anode while another in the bulk solution as cathode, i.e., the corrosion in the crevice solution was enhanced while the corrosion in the bulk solution was retarded. The anodic dissolution and the cathodic reduction processes dominate in the crevice solution and in the bulk solution, respectively. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006027/abstract [article] The corrosion behavior of carbon steel in CO2-saturated NaCl crevice solution containing acetic acid [texte imprimé] / Q. Hu, Auteur ; X. Guo, Auteur ; G. Zhang, Auteur . - 2013 . - pp. 720–728. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 8 (Août 2012) . - pp. 720–728 Mots-clés : Carbon  steel;  crevice  corrosion;  electrochemical  noise;  electrochemical  impedance  spectroscopy Résumé : The corrosion behavior of X52 carbon steel electrodes in CO2-saturated NaCl crevice solution containing HAc was investigated by electrochemical measurements. Chemical environment measurements by Cl− and pH microprobes show an enrichment of Cl− ions and an increase of pH values inside the crevice. Moreover, both increments could accelerate with the decreasing dimension of the crevice mouth due to the high diffusive resistance. When the electrode in the crevice solution is coupled with the electrode in bulk solution, the alkalization and the enrichment of Cl− ions in the crevice solution can result in a negative shift of potential of the electrode in crevice solution, while the potential of the electrode in bulk solution shifts positively during the corrosion process. Thus, a galvanic corrosion is established with the electrode in the crevice solution acting as anode while another in the bulk solution as cathode, i.e., the corrosion in the crevice solution was enhanced while the corrosion in the bulk solution was retarded. The anodic dissolution and the cathodic reduction processes dominate in the crevice solution and in the bulk solution, respectively. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006027/abstract