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Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy / Y. P. Xiao in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 127–133 Titre : Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 127–133 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al–Zn–Mg–Cu–Zr  alloy  containing  Sc;  electrochemical  impedance  spectroscopy  (EIS);  exfoliation  corrosion;  equivalent  circuit  (EC) Résumé : The exfoliation corrosion behavior of an Al–Zn–Mg–Cu–Zr alloy containing Sc artificially aged at 120 °C for 24 h is studied by macroscopic observation techniques and electrochemical impedance spectroscopy (EIS) measurements. After 48 h immersion, the blisters start bursting and delamination initiates, along with the appearance of two time constants in the impedance diagrams. According to the simulation by equivalent circuit, the corrosion rate decreases sharply and then reaches a steady state, which is due to the change of the solution pH and oxide layer thickness, as well as the accumulation of corrosion products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005696/abstract [article] Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy [texte imprimé] / Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur . - 2012 . - pp. 127–133. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 127–133 Mots-clés : Al–Zn–Mg–Cu–Zr  alloy  containing  Sc;  electrochemical  impedance  spectroscopy  (EIS);  exfoliation  corrosion;  equivalent  circuit  (EC) Résumé : The exfoliation corrosion behavior of an Al–Zn–Mg–Cu–Zr alloy containing Sc artificially aged at 120 °C for 24 h is studied by macroscopic observation techniques and electrochemical impedance spectroscopy (EIS) measurements. After 48 h immersion, the blisters start bursting and delamination initiates, along with the appearance of two time constants in the impedance diagrams. According to the simulation by equivalent circuit, the corrosion rate decreases sharply and then reaches a steady state, which is due to the change of the solution pH and oxide layer thickness, as well as the accumulation of corrosion products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005696/abstract

Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy / Y. P. Xiao in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 421–430 Titre : Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy Type de document : texte imprimé Auteurs : Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 421–430 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al_Zn_Mg_Cu_Zr_Sc  alloy;  exfoliation  corrosion;  heat  treatment;  electrochemical  impedance  spectroscopy;  polarization Résumé : Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of Al_Zn_Mg_Cu_Zr_Sc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr) and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, Al_Zn_Mg_Cu_Zr_Sc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005923/abstract [article] Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy [texte imprimé] / Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur . - 2012 . - pp. 421–430. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 421–430 Mots-clés : Al_Zn_Mg_Cu_Zr_Sc  alloy;  exfoliation  corrosion;  heat  treatment;  electrochemical  impedance  spectroscopy;  polarization Résumé : Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of Al_Zn_Mg_Cu_Zr_Sc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr) and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, Al_Zn_Mg_Cu_Zr_Sc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005923/abstract

Rigorous model for the simulation of gas adsorption and Its verification / W.B. Li in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8361-8370 Titre : Rigorous model for the simulation of gas adsorption and Its verification Type de document : texte imprimé Auteurs : W.B. Li, Auteur ; B.T. Liu, Auteur ; K.T. Yu, Auteur Année de publication : 2011 Article en page(s) : pp. 8361-8370 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption  Modeling Résumé : A rigorous model containing conservation equations of momentum, energy, and mass, with their k-ε, t2̄-εt, and newly developed c2̄-εc closing formulations was proposed for simulating the gas-solid adsorption process. The feature of the proposed model is that the unknown turbulent mass-transfer diffusivity Dt need not be estimated in advance. With this model, the breakthrough, regeneration, and temperature curves, as well as the Dt, were simulated for the methylene chloride adsorption and regeneration processes. The simulated results were closely checked by the published data. It was found that the D, was unevenly distributed in the axial and radial directions, which means that the Schmidt number or Peclet number is varying throughout the adsorption column and cannot be simply represented by a constant or a simple formula. The simulated results on axial and radial concentration distributions along the column at different time are helpful to understand the process dynamics. The proposed model is especially useful for simulating the adsorption process where the turbulent mass-transfer diffusivity is unavailable. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332163 [article] Rigorous model for the simulation of gas adsorption and Its verification [texte imprimé] / W.B. Li, Auteur ; B.T. Liu, Auteur ; K.T. Yu, Auteur . - 2011 . - pp. 8361-8370. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8361-8370 Mots-clés : Adsorption  Modeling Résumé : A rigorous model containing conservation equations of momentum, energy, and mass, with their k-ε, t2̄-εt, and newly developed c2̄-εc closing formulations was proposed for simulating the gas-solid adsorption process. The feature of the proposed model is that the unknown turbulent mass-transfer diffusivity Dt need not be estimated in advance. With this model, the breakthrough, regeneration, and temperature curves, as well as the Dt, were simulated for the methylene chloride adsorption and regeneration processes. The simulated results were closely checked by the published data. It was found that the D, was unevenly distributed in the axial and radial directions, which means that the Schmidt number or Peclet number is varying throughout the adsorption column and cannot be simply represented by a constant or a simple formula. The simulated results on axial and radial concentration distributions along the column at different time are helpful to understand the process dynamics. The proposed model is especially useful for simulating the adsorption process where the turbulent mass-transfer diffusivity is unavailable. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332163