Documents disponibles écrits par cet auteur

Cerium-based thermal conversion treatments on silicon carbide reinforced 2009 aluminum alloy composites / I. Aziz in Materials and corrosion, Vol. 62 N° 3 (Mars 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 258–263 Titre : Cerium-based thermal conversion treatments on silicon carbide reinforced 2009 aluminum alloy composites Type de document : texte imprimé Auteurs : I. Aziz, Auteur ; Zhang, Q, Auteur ; J. Du, Auteur Année de publication : 2011 Article en page(s) : pp. 258–263 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cerium  chloride  Potentiodynamic  polarization  SiCp/2009  aluminum  composite  Thermal  conversion  coating  XPS Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The conversion coatings on SiCp/2009 aluminum (Al) composites and 2009 Al alloy were obtained by immersing the samples into the cerium (Ce)-based solutions with varying the chemical concentration (CeCl3·7H2O, NaCl), solution pH/temperature, immersing time, and drying temperature. The corrosion inhibition mechanism and kinetics were studied by using the electrochemical techniques and surface analyses. Potentiodynamic polarization tests showed that coatings improved corrosion resistance as compared to untreated samples and environmental factors played important role in the formation of conversion layer. Scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) analysis revealed that relatively high inhibition efficiency for composite with 25 vol% SiCp was due to the existence of rather high surface area of cathodic intermetallics/SiCp, which support to deposit Ce oxides/hydroxides on the entire surface. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905485/abstract [article] Cerium-based thermal conversion treatments on silicon carbide reinforced 2009 aluminum alloy composites [texte imprimé] / I. Aziz, Auteur ; Zhang, Q, Auteur ; J. Du, Auteur . - 2011 . - pp. 258–263. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 258–263 Mots-clés : Cerium  chloride  Potentiodynamic  polarization  SiCp/2009  aluminum  composite  Thermal  conversion  coating  XPS Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The conversion coatings on SiCp/2009 aluminum (Al) composites and 2009 Al alloy were obtained by immersing the samples into the cerium (Ce)-based solutions with varying the chemical concentration (CeCl3·7H2O, NaCl), solution pH/temperature, immersing time, and drying temperature. The corrosion inhibition mechanism and kinetics were studied by using the electrochemical techniques and surface analyses. Potentiodynamic polarization tests showed that coatings improved corrosion resistance as compared to untreated samples and environmental factors played important role in the formation of conversion layer. Scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) analysis revealed that relatively high inhibition efficiency for composite with 25 vol% SiCp was due to the existence of rather high surface area of cathodic intermetallics/SiCp, which support to deposit Ce oxides/hydroxides on the entire surface. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905485/abstract

Lanthanide salts as thermal conversion coatings on silicon carbide reinforced AA5A06 aluminium metal matrix composite / I. Aziz in Materials and corrosion, Vol. 61 N° 7 (Juillet 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 7 (Juillet 2010) . - pp. 568–573 Titre : Lanthanide salts as thermal conversion coatings on silicon carbide reinforced AA5A06 aluminium metal matrix composite Type de document : texte imprimé Auteurs : I. Aziz, Auteur ; Q. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 568–573 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : EIS;  lanthanide  chloride;  silicon  carbide/AA5A06  aluminium  composite;  thermal  conversion  coating;  XPS Résumé : In this study, cerium and lanthanum chloride binary mixtures conversion coatings were investigated as corrosion inhibitors for silicon carbide particulates reinforced AA5A06 aluminium composite and AA5A06 aluminium alloy. Electrochemical impedance spectroscopy and potentiodynamic polarization tests revealed that cerium (III) chloride additions markedly improved the pitting corrosion resistance as compared to lanthanum (III) chloride additions, with maximum increase noted for samples treated with 750 ppm cerium (III) + 250 ppm lanthanum (III) chlorides. Scanning electron microscopy, energy dispersion spectroscopy and X-ray photoelectron spectroscopy examinations revealed the existence of a heterogeneous layer formed by precipitation of cerium/lanthanum oxide/hydroxide on the cathodic intermetallics and an aluminium oxide film on the rest of the metal matrix. Improved corrosion resistance was attained for SiC particulates reinforced aluminium composite by means of the cerium/lanthanum conversion treatment, due to the presence of mainly cerium (IV) species as a result of oxidation of cerium (III), which provides auto-protection properties. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905387/abstract [article] Lanthanide salts as thermal conversion coatings on silicon carbide reinforced AA5A06 aluminium metal matrix composite [texte imprimé] / I. Aziz, Auteur ; Q. Zhang, Auteur . - 2010 . - pp. 568–573. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 7 (Juillet 2010) . - pp. 568–573 Mots-clés : EIS;  lanthanide  chloride;  silicon  carbide/AA5A06  aluminium  composite;  thermal  conversion  coating;  XPS Résumé : In this study, cerium and lanthanum chloride binary mixtures conversion coatings were investigated as corrosion inhibitors for silicon carbide particulates reinforced AA5A06 aluminium composite and AA5A06 aluminium alloy. Electrochemical impedance spectroscopy and potentiodynamic polarization tests revealed that cerium (III) chloride additions markedly improved the pitting corrosion resistance as compared to lanthanum (III) chloride additions, with maximum increase noted for samples treated with 750 ppm cerium (III) + 250 ppm lanthanum (III) chlorides. Scanning electron microscopy, energy dispersion spectroscopy and X-ray photoelectron spectroscopy examinations revealed the existence of a heterogeneous layer formed by precipitation of cerium/lanthanum oxide/hydroxide on the cathodic intermetallics and an aluminium oxide film on the rest of the metal matrix. Improved corrosion resistance was attained for SiC particulates reinforced aluminium composite by means of the cerium/lanthanum conversion treatment, due to the presence of mainly cerium (IV) species as a result of oxidation of cerium (III), which provides auto-protection properties. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905387/abstract