Documents disponibles écrits par cet auteur

Corrosion behavior of Mg-10Gd-2Y-0.4Zr alloy under thin electrolyte layers / C. Chen in Materials and corrosion, Vol. 61 N° 5 (Mai 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 5 (Mai 2010) . - pp. 388–397 Titre : Corrosion behavior of Mg-10Gd-2Y-0.4Zr alloy under thin electrolyte layers Type de document : texte imprimé Auteurs : C. Chen, Auteur ; T. Zhang, Auteur ; G. Meng, Auteur Année de publication : 2010 Article en page(s) : pp. 388–397 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : corrosion;  electrochemical  noise;  magnesium  alloy;  stochastic  analysis;  thin  electrolyte  layer Résumé : The corrosion behavior of Mg-10Gd-2Y-0.4Zr (GW102K) alloy under thin electrolyte layer (TEL) with various thicknesses was investigated by means of cathodic polarization curve, electrochemical impedance spectroscopy (EIS), and electrochemical noise (EN). Based on shot noise theory and stochastic theory, the EN results were quantitatively analyzed by using the Weibull and Gumbel distribution function, respectively. The experimental results showed that the anodic and cathodic processes of the corrosion of GW102K alloy were both retained under thin electrolyte layers. Whether under TEL or not, the cathodic process was dominated by hydrogen evolution reaction. The corrosion was more localized under thin electrolyte layer than that in bulk solution. The results also demonstrated that there were two kinds of effects for thin electrolyte layer on the corrosion behavior of GW102K alloy: (i) the rate of pit initiation was evidently retarded compared to that in bulk solution; (ii) the probability of pit growth decreased, which should be the real reason why the corrosion rate of GW102K alloy decreased with the decrease in layer thickness. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905330/abstract [article] Corrosion behavior of Mg-10Gd-2Y-0.4Zr alloy under thin electrolyte layers [texte imprimé] / C. Chen, Auteur ; T. Zhang, Auteur ; G. Meng, Auteur . - 2010 . - pp. 388–397. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 5 (Mai 2010) . - pp. 388–397 Mots-clés : corrosion;  electrochemical  noise;  magnesium  alloy;  stochastic  analysis;  thin  electrolyte  layer Résumé : The corrosion behavior of Mg-10Gd-2Y-0.4Zr (GW102K) alloy under thin electrolyte layer (TEL) with various thicknesses was investigated by means of cathodic polarization curve, electrochemical impedance spectroscopy (EIS), and electrochemical noise (EN). Based on shot noise theory and stochastic theory, the EN results were quantitatively analyzed by using the Weibull and Gumbel distribution function, respectively. The experimental results showed that the anodic and cathodic processes of the corrosion of GW102K alloy were both retained under thin electrolyte layers. Whether under TEL or not, the cathodic process was dominated by hydrogen evolution reaction. The corrosion was more localized under thin electrolyte layer than that in bulk solution. The results also demonstrated that there were two kinds of effects for thin electrolyte layer on the corrosion behavior of GW102K alloy: (i) the rate of pit initiation was evidently retarded compared to that in bulk solution; (ii) the probability of pit growth decreased, which should be the real reason why the corrosion rate of GW102K alloy decreased with the decrease in layer thickness. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905330/abstract

Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy / X. Liu in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 505–516 Titre : Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy Type de document : texte imprimé Auteurs : X. Liu, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur Année de publication : 2012 Article en page(s) : pp. 505–516 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  electrochemical  techniques;  magnesium  alloy;  surface;  XPS Résumé : AZ91D magnesium alloy was treated by the alternating voltage (AV) treatment technique. The optimal AV-treatment parameters of the alloy were determined by orthogonal experiments. Polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SECM) were used to understand the effect of AV-treatment on the corrosion resistance of the alloy. AFM, contact angle, and XPS were employed to investigate further the influence of AV-treatment on the properties of the surface film formed on the alloy after AV-treatment. The results showed that a uniform and stable film was formed and the corrosion resistance of AZ91D magnesium alloy was significantly improved after AV-treatment. This was caused by the noticeable change of the chemical structure and semi-conducting properties of the surface film after AV-treatment. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005999/abstract [article] Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy [texte imprimé] / X. Liu, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur . - 2012 . - pp. 505–516. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 505–516 Mots-clés : Corrosion;  electrochemical  techniques;  magnesium  alloy;  surface;  XPS Résumé : AZ91D magnesium alloy was treated by the alternating voltage (AV) treatment technique. The optimal AV-treatment parameters of the alloy were determined by orthogonal experiments. Polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SECM) were used to understand the effect of AV-treatment on the corrosion resistance of the alloy. AFM, contact angle, and XPS were employed to investigate further the influence of AV-treatment on the properties of the surface film formed on the alloy after AV-treatment. The results showed that a uniform and stable film was formed and the corrosion resistance of AZ91D magnesium alloy was significantly improved after AV-treatment. This was caused by the noticeable change of the chemical structure and semi-conducting properties of the surface film after AV-treatment. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005999/abstract

Effect of hydrostatic pressure on the nature of passive film of pure nickel / B. Liu in Materials and corrosion, Vol. 62 N° 3 (Mars 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 269–274 Titre : Effect of hydrostatic pressure on the nature of passive film of pure nickel Type de document : texte imprimé Auteurs : B. Liu, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur Année de publication : 2011 Article en page(s) : pp. 269–274 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  Deep  ocean  Hydrostatic  pressure  Nickel  Passive  film Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The effect of hydrostatic pressure on the nature of passive film of nickel in 3.5% NaCl solution was investigated by means of polarization curves, electrochemical impedance spectroscopy (EIS), and Mott–Schottky measurement. The experimental results revealed that hydrostatic pressure had two opposite effects on passive film of nickel. On one hand, hydrostatic pressure improved the corrosion resistance of passive film of nickel such as the decreased acceptor density. On the other hand, the passive film became unstable and showed a higher diffusivity of acceptor density with the increasing of hydrostatic pressure, which deteriorated the corrosion resistance of passive film of nickel. The deterioration effect had greater influence on the passive film than the improvement effect, which led to the decreasing corrosion resistance of passive film with the increasing of hydrostatic pressure. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905372/abstract [article] Effect of hydrostatic pressure on the nature of passive film of pure nickel [texte imprimé] / B. Liu, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur . - 2011 . - pp. 269–274. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 269–274 Mots-clés : Corrosion  Deep  ocean  Hydrostatic  pressure  Nickel  Passive  film Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The effect of hydrostatic pressure on the nature of passive film of nickel in 3.5% NaCl solution was investigated by means of polarization curves, electrochemical impedance spectroscopy (EIS), and Mott–Schottky measurement. The experimental results revealed that hydrostatic pressure had two opposite effects on passive film of nickel. On one hand, hydrostatic pressure improved the corrosion resistance of passive film of nickel such as the decreased acceptor density. On the other hand, the passive film became unstable and showed a higher diffusivity of acceptor density with the increasing of hydrostatic pressure, which deteriorated the corrosion resistance of passive film of nickel. The deterioration effect had greater influence on the passive film than the improvement effect, which led to the decreasing corrosion resistance of passive film with the increasing of hydrostatic pressure. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905372/abstract

Electrochemical corrosion behavior of plasma sprayed Al2O3-13%TiO2 coatings in aqueous hydrochloric acid solution / Y. Wang in Materials and corrosion, Vol. 61 N° 7 (Juillet 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 7 (Juillet 2010) . - pp. 611–617 Titre : Electrochemical corrosion behavior of plasma sprayed Al2O3-13%TiO2 coatings in aqueous hydrochloric acid solution Type de document : texte imprimé Auteurs : Y. Wang, Auteur ; W. Tian, Auteur ; T. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 611–617 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al2O3-13%TiO2  coatings;  electrochemical  corrosion;  plasma  spray Résumé : One kind of conventional and two kinds of nanostructured Al2O3-13%TiO2 coatings were prepared by plasma spray process. The phase composition and microstructure of coatings were examined by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to investigate the corrosion behavior of coatings in aqueous hydrochloric acid solution. The results showed that nanostructured coatings had superior corrosion resistance compared to conventional Metco 130 coating. The corrosion resistance of coatings was mainly related to their microstructure and defects density. The EIS measurement for long time immersion in hydrochloric acid solution revealed that the corrosion resistance of coatings decreased with the increasing of immersion time. During the immersion period, electrochemical corrosion mainly occurred on the carbon steel substrate under NiCrAl coatings. In addition, the Al2O3-13%TiO2 coatings were also failed during corrosion in aqueous hydrochloric acid solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905335/abstract [article] Electrochemical corrosion behavior of plasma sprayed Al2O3-13%TiO2 coatings in aqueous hydrochloric acid solution [texte imprimé] / Y. Wang, Auteur ; W. Tian, Auteur ; T. Zhang, Auteur . - 2010 . - pp. 611–617. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 7 (Juillet 2010) . - pp. 611–617 Mots-clés : Al2O3-13%TiO2  coatings;  electrochemical  corrosion;  plasma  spray Résumé : One kind of conventional and two kinds of nanostructured Al2O3-13%TiO2 coatings were prepared by plasma spray process. The phase composition and microstructure of coatings were examined by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to investigate the corrosion behavior of coatings in aqueous hydrochloric acid solution. The results showed that nanostructured coatings had superior corrosion resistance compared to conventional Metco 130 coating. The corrosion resistance of coatings was mainly related to their microstructure and defects density. The EIS measurement for long time immersion in hydrochloric acid solution revealed that the corrosion resistance of coatings decreased with the increasing of immersion time. During the immersion period, electrochemical corrosion mainly occurred on the carbon steel substrate under NiCrAl coatings. In addition, the Al2O3-13%TiO2 coatings were also failed during corrosion in aqueous hydrochloric acid solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905335/abstract

A stochastic analysis of the effect of magnetic field on the pitting corrosion susceptibility of pure magnesium / J. Li in Materials and corrosion, Vol. 61 N° 4 (Avril 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 4 (Avril 2010) . - pp. 306–312 Titre : A stochastic analysis of the effect of magnetic field on the pitting corrosion susceptibility of pure magnesium Type de document : texte imprimé Auteurs : J. Li, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur Année de publication : 2010 Article en page(s) : pp. 306–312 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Magnesium;  magnetic  field;  pitting  corrosion;  potentiostatic;  stochastic  analysis Résumé : The effect of magnetic field on the pitting corrosion susceptibility of pure magnesium was investigated by stochastic approaches. Stochastic models had been applied to simulate pitting corrosion as the combination of two physical processes: pit initiation and pit growth. The results revealed that magnetic field increased the pitting corrosion susceptibility of pure magnesium. For the pit initiation process, the presence of magnetic field changed the mechanism of pit initiation from the parallel birth and death stochastic model (B1) to the parallel birth stochastic model (A3). Magnetic field increased the pit generation rate λ while decreased the repassivation rate µ, which indicated that magnetic field accelerated the pit initiation process of pure magnesium. For the pit growth process, magnetic field didn't change the pit growth mechanism, but it could decrease the ability of repassivation of pitting corrosion resulting in a great probability for the stable pitting corrosion to grow up with a higher growth rate and finally develop into larger pit cavity. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905290/abstract [article] A stochastic analysis of the effect of magnetic field on the pitting corrosion susceptibility of pure magnesium [texte imprimé] / J. Li, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur . - 2010 . - pp. 306–312. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 4 (Avril 2010) . - pp. 306–312 Mots-clés : Magnesium;  magnetic  field;  pitting  corrosion;  potentiostatic;  stochastic  analysis Résumé : The effect of magnetic field on the pitting corrosion susceptibility of pure magnesium was investigated by stochastic approaches. Stochastic models had been applied to simulate pitting corrosion as the combination of two physical processes: pit initiation and pit growth. The results revealed that magnetic field increased the pitting corrosion susceptibility of pure magnesium. For the pit initiation process, the presence of magnetic field changed the mechanism of pit initiation from the parallel birth and death stochastic model (B1) to the parallel birth stochastic model (A3). Magnetic field increased the pit generation rate λ while decreased the repassivation rate µ, which indicated that magnetic field accelerated the pit initiation process of pure magnesium. For the pit growth process, magnetic field didn't change the pit growth mechanism, but it could decrease the ability of repassivation of pitting corrosion resulting in a great probability for the stable pitting corrosion to grow up with a higher growth rate and finally develop into larger pit cavity. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905290/abstract