Documents disponibles écrits par cet auteur

Corrosion resistance of environment-friendly sealing layer for Zn-coated sintered NdFeB magnet / F. Liu in Materials and corrosion, Vol. 62 N° 12 (Décembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1141–1148 Titre : Corrosion resistance of environment-friendly sealing layer for Zn-coated sintered NdFeB magnet Type de document : texte imprimé Auteurs : F. Liu, Auteur ; Q. Li, Auteur ; X. K. Yang, Auteur Année de publication : 2012 Article en page(s) : pp. 1141–1148 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  protection  Electrochemical  impedance  spectroscopy  Potentiodynamic  polarization  Sintered  NdFeB  permanent  magnet Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a protective sealed Zn coating (SZC) was prepared on sintered NdFeB magnet by the combination of electrodeposition and sol–gel method. The unsealed Zn coating (UZC) was also studied for a comparison. The surface morphology of UZC and the cross-section morphology of SZC were investigated using scanning election microscope (SEM). The microstructure of Zn coating and structure of sealing layer were studied by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrum, respectively. The corrosion characteristics of SZC and UZC in neutral 3.5 wt% NaCl solution were evaluated using electrochemical measurements including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization test, indicating that the anticorrosive properties of SZC coated specimens increased 20 times compared with that of UZC coated specimens. In order to further investigate the anticorrosive properties of SZC, a long-term immersion test was carried out in neutral 3.5 wt% NaCl solution using EIS. The results of long-term corrosion test showed that the SZC could provide long-term protection in neutral 3.5 wt% NaCl solution for NdFeB magnet. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006039/abstract [article] Corrosion resistance of environment-friendly sealing layer for Zn-coated sintered NdFeB magnet [texte imprimé] / F. Liu, Auteur ; Q. Li, Auteur ; X. K. Yang, Auteur . - 2012 . - pp. 1141–1148. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1141–1148 Mots-clés : Corrosion  protection  Electrochemical  impedance  spectroscopy  Potentiodynamic  polarization  Sintered  NdFeB  permanent  magnet Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a protective sealed Zn coating (SZC) was prepared on sintered NdFeB magnet by the combination of electrodeposition and sol–gel method. The unsealed Zn coating (UZC) was also studied for a comparison. The surface morphology of UZC and the cross-section morphology of SZC were investigated using scanning election microscope (SEM). The microstructure of Zn coating and structure of sealing layer were studied by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrum, respectively. The corrosion characteristics of SZC and UZC in neutral 3.5 wt% NaCl solution were evaluated using electrochemical measurements including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization test, indicating that the anticorrosive properties of SZC coated specimens increased 20 times compared with that of UZC coated specimens. In order to further investigate the anticorrosive properties of SZC, a long-term immersion test was carried out in neutral 3.5 wt% NaCl solution using EIS. The results of long-term corrosion test showed that the SZC could provide long-term protection in neutral 3.5 wt% NaCl solution for NdFeB magnet. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006039/abstract

Effect of sulphate reducing bacteria on corrosion of Al_Zn_In_Sn sacrificial anodes in marine sediment / F. Liu in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 431–437 Titre : Effect of sulphate reducing bacteria on corrosion of Al_Zn_In_Sn sacrificial anodes in marine sediment Type de document : texte imprimé Auteurs : F. Liu, Auteur ; J. Zhang, Auteur ; S. Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 431–437 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Metals  and  alloys;  corrosion;  electrochemical  impedance  spectroscopy  (EIS);  scanning  electron  microscopy  (SEM) Résumé : Microbiologically influenced corrosion (MIC) of Al_Zn_In_Sn sacrificial anodes in marine sediment was investigated by exposing samples to sulphate reducing bacteria (SRB). Samples exposed to the sterile marine sediment were used as control. The results show that pitting corrosion occurs in both the sterile marine sediment and the SRB-containing marine sediment. However, the corrosion can be increased sharply by the SRB metabolic activity due to the cathodic depolarization effect. In fact, the effect is based on the consumption of hydrogen which probably results in the acceleration of galvanic corrosion between corrosion products and metal substrate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005955/abstract [article] Effect of sulphate reducing bacteria on corrosion of Al_Zn_In_Sn sacrificial anodes in marine sediment [texte imprimé] / F. Liu, Auteur ; J. Zhang, Auteur ; S. Zhang, Auteur . - 2012 . - pp. 431–437. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 431–437 Mots-clés : Metals  and  alloys;  corrosion;  electrochemical  impedance  spectroscopy  (EIS);  scanning  electron  microscopy  (SEM) Résumé : Microbiologically influenced corrosion (MIC) of Al_Zn_In_Sn sacrificial anodes in marine sediment was investigated by exposing samples to sulphate reducing bacteria (SRB). Samples exposed to the sterile marine sediment were used as control. The results show that pitting corrosion occurs in both the sterile marine sediment and the SRB-containing marine sediment. However, the corrosion can be increased sharply by the SRB metabolic activity due to the cathodic depolarization effect. In fact, the effect is based on the consumption of hydrogen which probably results in the acceleration of galvanic corrosion between corrosion products and metal substrate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005955/abstract

Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations / F. Liu in Acta materialia, Vol. 58 N° 19 (Novembre 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6542–6553 Titre : Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations : Calorimetric analysis of the crystallization of amorphous Zr50Al10Ni40 Type de document : texte imprimé Auteurs : F. Liu, Auteur ; H. Nitsche, Auteur ; F. Sommer, Auteur Année de publication : 2011 Article en page(s) : pp. 6542–6553 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nucleation  Growth  Impingement  Crystallization  kinetics Résumé : The crystallization kinetics of amorphous Zr50Al10Ni40, as measured by means of both isothermal and isochronal differential scanning calorimetry, were evaluated using a new procedure involving application of a modular analytical model to provide a complete description of the phase-transformation kinetics, in combination with a preceding analysis of the transformation-rate maximum. The power of detailed analysis of the position of the transformation-rate maximum, as a function of the transformed fraction, was demonstrated by identification of the operating impingement mode. On this basis, the kinetic parameters governing the crystallization kinetics could then be determined quantitatively using the modular analytical model. The crystallization governing mechanisms could be varied by appropriate control of the crystallization conditions. The results obtained are consistent with the microstructural evolution, as observed by transmission electron microscopy. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005331 [article] Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations : Calorimetric analysis of the crystallization of amorphous Zr50Al10Ni40 [texte imprimé] / F. Liu, Auteur ; H. Nitsche, Auteur ; F. Sommer, Auteur . - 2011 . - pp. 6542–6553. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6542–6553 Mots-clés : Nucleation  Growth  Impingement  Crystallization  kinetics Résumé : The crystallization kinetics of amorphous Zr50Al10Ni40, as measured by means of both isothermal and isochronal differential scanning calorimetry, were evaluated using a new procedure involving application of a modular analytical model to provide a complete description of the phase-transformation kinetics, in combination with a preceding analysis of the transformation-rate maximum. The power of detailed analysis of the position of the transformation-rate maximum, as a function of the transformed fraction, was demonstrated by identification of the operating impingement mode. On this basis, the kinetic parameters governing the crystallization kinetics could then be determined quantitatively using the modular analytical model. The crystallization governing mechanisms could be varied by appropriate control of the crystallization conditions. The results obtained are consistent with the microstructural evolution, as observed by transmission electron microscopy. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005331

Parallel machines scheduling with a deteriorating maintenance activity / J-J. Wang in Journal of the operational research society (JORS), Vol. 62 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 62 N° 10 (Octobre 2011) . - pp. 1898–1902 Titre : Parallel machines scheduling with a deteriorating maintenance activity Type de document : texte imprimé Auteurs : J-J. Wang, Auteur ; Wang, J.-B., Auteur ; F. Liu, Auteur Année de publication : 2011 Article en page(s) : pp. 1898–1902 Note générale : Recherche opérationnelle Langues : Anglais (eng) Mots-clés : Scheduling  Parallel  identical  machines  Maintenance  activity  Polynomial  algorithm Index. décimale : 001.424 Résumé : In this paper, we consider parallel identical machines scheduling problems with a deteriorating maintenance activity. In this model, each machine has a deteriorating maintenance activity, that is, delaying the maintenance increases the time required to perform it. We need to make a decision on when to schedule the deteriorating maintenance activities and the sequence of jobs to minimize total completion time. We provide a polynomial time algorithm to solve the total completion time minimization problem. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n10/abs/jors2010143a.html [article] Parallel machines scheduling with a deteriorating maintenance activity [texte imprimé] / J-J. Wang, Auteur ; Wang, J.-B., Auteur ; F. Liu, Auteur . - 2011 . - pp. 1898–1902. Recherche opérationnelle Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 62 N° 10 (Octobre 2011) . - pp. 1898–1902 Mots-clés : Scheduling  Parallel  identical  machines  Maintenance  activity  Polynomial  algorithm Index. décimale : 001.424 Résumé : In this paper, we consider parallel identical machines scheduling problems with a deteriorating maintenance activity. In this model, each machine has a deteriorating maintenance activity, that is, delaying the maintenance increases the time required to perform it. We need to make a decision on when to schedule the deteriorating maintenance activities and the sequence of jobs to minimize total completion time. We provide a polynomial time algorithm to solve the total completion time minimization problem. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v62/n10/abs/jors2010143a.html