Documents disponibles écrits par cet auteur

Corrosion electrochemical behaviors of silane coating coated magnesium alloy in NaCl solution containing cerium nitrate / F. Luo in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 148–154 Titre : Corrosion electrochemical behaviors of silane coating coated magnesium alloy in NaCl solution containing cerium nitrate Type de document : texte imprimé Auteurs : F. Luo, Auteur ; Q. Li, Auteur ; X. K. Zhong, Auteur Année de publication : 2012 Article en page(s) : pp. 148–154 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cerium  nitrate;  corrosion  inhibition;  magnesium  alloy;  sol–gel  coating Résumé : Sol–gel coatings cannot provide adequate corrosion protection for metal/alloys in the corrosive environments due to their high crack-forming potential. This paper demonstrates the possibility to employ cerium nitrate as inhibitor to decrease the corrosion development of sol–gel-based silane coating on the magnesium alloy in NaCl solution. Cerium nitrate was added into the NaCl solution where the silane coating coated magnesium alloy was immersed. Scanning electron microcopy (SEM) was used to examine surface morphology of the silane coating coated magnesium alloy immersed in NaCl solutions doped and undoped with cerium nitrate. The corrosion electrochemical behaviors were investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The results showed that the introduction of cerium nitrate into NaCl solution could effectively inhibit the corrosion of the silane coating coated magnesium alloy. Moreover, the influence of concentration of cerium nitrate on the corrosion inhibition and the possible inhibiting mechanism were also discussed in detail. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005706/abstract [article] Corrosion electrochemical behaviors of silane coating coated magnesium alloy in NaCl solution containing cerium nitrate [texte imprimé] / F. Luo, Auteur ; Q. Li, Auteur ; X. K. Zhong, Auteur . - 2012 . - pp. 148–154. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 148–154 Mots-clés : Cerium  nitrate;  corrosion  inhibition;  magnesium  alloy;  sol–gel  coating Résumé : Sol–gel coatings cannot provide adequate corrosion protection for metal/alloys in the corrosive environments due to their high crack-forming potential. This paper demonstrates the possibility to employ cerium nitrate as inhibitor to decrease the corrosion development of sol–gel-based silane coating on the magnesium alloy in NaCl solution. Cerium nitrate was added into the NaCl solution where the silane coating coated magnesium alloy was immersed. Scanning electron microcopy (SEM) was used to examine surface morphology of the silane coating coated magnesium alloy immersed in NaCl solutions doped and undoped with cerium nitrate. The corrosion electrochemical behaviors were investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The results showed that the introduction of cerium nitrate into NaCl solution could effectively inhibit the corrosion of the silane coating coated magnesium alloy. Moreover, the influence of concentration of cerium nitrate on the corrosion inhibition and the possible inhibiting mechanism were also discussed in detail. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005706/abstract

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

Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO2 composite coating prepared on sintered NdFeB magnet / X. K. Yang in Materials and corrosion, Vol. 61 N° 7 (Juillet 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 7 (Juillet 2010) . - pp. 618–625 Titre : Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO2 composite coating prepared on sintered NdFeB magnet Type de document : texte imprimé Auteurs : X. K. Yang, Auteur ; Q. Li, Auteur ; S. Y. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 618–625 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Electrochemical  impedance  spectroscopy;  NdFeB  magnet;  Ni–Co–TiO2  composite  coating;  potentiodynamic  polarization Résumé : In this paper, a protective Ni–Co–TiO2 composite coating was prepared on the sintered NdFeB magnet by direct current electrodeposition. The surface morphologies, microstructure, and chemical composition of the composite coating were studied using scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The surface morphologies and microstructure analysis showed that the composite coating possessed cauliflower-like grain colonies, and formed face-centered cubic (fcc) solid solution. The electrochemical corrosion behaviors of the composite coating in 0.5 mol/L H2SO4, 0.6 mol/L NaOH, 0.6 mol/L Na2SO4, and neutral 3.5 wt% NaCl solutions were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS), showing good protection for NdFeB magnet. In order to further investigate the protective properties of the composite coating for NdFeB magnet and the practicability of the composite coating, the long-term immersion test was carried out in neutral 3.5 wt% NaCl solutions using EIS. The results of long-term corrosion test showed that the Ni–Co–TiO2 composite coating could provide long-term protection in neutral 3.5 wt% NaCl solutions for NdFeB magnet. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905449/abstract [article] Electrochemical corrosion behaviors and protective properties of Ni–Co–TiO2 composite coating prepared on sintered NdFeB magnet [texte imprimé] / X. K. Yang, Auteur ; Q. Li, Auteur ; S. Y. Zhang, Auteur . - 2010 . - pp. 618–625. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 7 (Juillet 2010) . - pp. 618–625 Mots-clés : Electrochemical  impedance  spectroscopy;  NdFeB  magnet;  Ni–Co–TiO2  composite  coating;  potentiodynamic  polarization Résumé : In this paper, a protective Ni–Co–TiO2 composite coating was prepared on the sintered NdFeB magnet by direct current electrodeposition. The surface morphologies, microstructure, and chemical composition of the composite coating were studied using scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The surface morphologies and microstructure analysis showed that the composite coating possessed cauliflower-like grain colonies, and formed face-centered cubic (fcc) solid solution. The electrochemical corrosion behaviors of the composite coating in 0.5 mol/L H2SO4, 0.6 mol/L NaOH, 0.6 mol/L Na2SO4, and neutral 3.5 wt% NaCl solutions were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS), showing good protection for NdFeB magnet. In order to further investigate the protective properties of the composite coating for NdFeB magnet and the practicability of the composite coating, the long-term immersion test was carried out in neutral 3.5 wt% NaCl solutions using EIS. The results of long-term corrosion test showed that the Ni–Co–TiO2 composite coating could provide long-term protection in neutral 3.5 wt% NaCl solutions for NdFeB magnet. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905449/abstract

Electrodeposition of zinc on AZ91D magnesium alloy pre-treated by stannate conversion coatings / S. Y. Zhang in Materials and corrosion, Vol. 61 N° 10 (Octobre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 860–865 Titre : Electrodeposition of zinc on AZ91D magnesium alloy pre-treated by stannate conversion coatings Type de document : texte imprimé Auteurs : S. Y. Zhang, Auteur ; Q. Li, Auteur ; B. Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 860–865 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : AZ91D  magnesium  alloy;  corrosion  resistance;  stannate  conversion  coating;  zinc  electrodeposition Résumé : A stannate chemical conversion process followed by an activation procedure was employed as the pre-treatment process for AZ91D magnesium alloy substrate. Zn was electroplated onto the pre-treated AZ91D magnesium alloy surface from pyrophosphate bath to improve the corrosion resistance and the solderability. The surface morphologies of conversion coating and zinc coating were examined with scanning electron microscope (SEM). The phase composition of conversion coating was investigated by X-ray diffraction (XRD). The electrochemical corrosion behavior of the coatings in the corrosive solution was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results showed that the activated stannate chemical conversion coating provided a suitable interface between zinc coating and the AZ91D magnesium alloy substrate. The corrosion resistance of the AZ91D substrate was improved by the zinc coating. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905435/abstract [article] Electrodeposition of zinc on AZ91D magnesium alloy pre-treated by stannate conversion coatings [texte imprimé] / S. Y. Zhang, Auteur ; Q. Li, Auteur ; B. Chen, Auteur . - 2011 . - pp. 860–865. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 860–865 Mots-clés : AZ91D  magnesium  alloy;  corrosion  resistance;  stannate  conversion  coating;  zinc  electrodeposition Résumé : A stannate chemical conversion process followed by an activation procedure was employed as the pre-treatment process for AZ91D magnesium alloy substrate. Zn was electroplated onto the pre-treated AZ91D magnesium alloy surface from pyrophosphate bath to improve the corrosion resistance and the solderability. The surface morphologies of conversion coating and zinc coating were examined with scanning electron microscope (SEM). The phase composition of conversion coating was investigated by X-ray diffraction (XRD). The electrochemical corrosion behavior of the coatings in the corrosive solution was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results showed that the activated stannate chemical conversion coating provided a suitable interface between zinc coating and the AZ91D magnesium alloy substrate. The corrosion resistance of the AZ91D substrate was improved by the zinc coating. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905435/abstract

Influence of MWCNT dispersion on corrosion behaviour of their Mg composites / Q. Li in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 384–387 Titre : Influence of MWCNT dispersion on corrosion behaviour of their Mg composites Type de document : texte imprimé Auteurs : Q. Li, Auteur ; M. C. Turhan, Auteur ; C. A. Rottmair, Auteur Année de publication : 2012 Article en page(s) : pp. 384–387 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : CNT  dispersion;  corrosion;  magnesium  alloys;  metal  matrix  composites;  multiwall  carbon  nanotubes Résumé : Carbon nanotubes (CNTs) have been demonstrated as good reinforcements to improve mechanical properties of magnesium alloys. This study reports on the influence of CNT dispersion on corrosion behaviour of their Mg composites. Experiments revealed that the corrosion rate is drastically increased by adding CNTs to the magnesium alloy due to galvanic coupling. Moreover, a homogeneous CNT dispersion leads to reduced corrosion resistivity. Surface pre-treatment is also found to be critical for the corrosion performance for both 1 and 5 wt% CNT composites. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006023/abstract [article] Influence of MWCNT dispersion on corrosion behaviour of their Mg composites [texte imprimé] / Q. Li, Auteur ; M. C. Turhan, Auteur ; C. A. Rottmair, Auteur . - 2012 . - pp. 384–387. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 384–387 Mots-clés : CNT  dispersion;  corrosion;  magnesium  alloys;  metal  matrix  composites;  multiwall  carbon  nanotubes Résumé : Carbon nanotubes (CNTs) have been demonstrated as good reinforcements to improve mechanical properties of magnesium alloys. This study reports on the influence of CNT dispersion on corrosion behaviour of their Mg composites. Experiments revealed that the corrosion rate is drastically increased by adding CNTs to the magnesium alloy due to galvanic coupling. Moreover, a homogeneous CNT dispersion leads to reduced corrosion resistivity. Surface pre-treatment is also found to be critical for the corrosion performance for both 1 and 5 wt% CNT composites. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006023/abstract

Modeling and dynamic characteristic simulation of a proton exchange membrane fuel cell / Jia, J. in IEEE transactions on energy conversion, Vol. 24 N°1 (Mars 2009) 

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Preparation and characterization of inorganic and organic coatings on AZ91D magnesium alloy with electroless plating pretreatment / S. Y. Zhang in Materials and corrosion, Vol. 62 N° 9 (Septembre 2011) 

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