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The effect of Ca on corrosion behavior of heat-treated Mg–Al–Zn alloy / Y.-Q. Wang in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 497–504 Titre : The effect of Ca on corrosion behavior of heat-treated Mg–Al–Zn alloy Type de document : texte imprimé Auteurs : Y.-Q. Wang, Auteur ; M.-Z. Li, Auteur ; C. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 497–504 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ca;  corrosion;  magnesium  alloy;  microstructure Résumé : The effect of 0.5, 1.0, and 1.5 wt% Ca additions on the microstructure and corrosion resistance of the heat-treated Mg–Al–Zn alloy was investigated. Addition of 0.5 wt% Ca did not form any new phase but suppressed the discontinuous precipitation of the β-Mg17Al12 phase by being dissolved in both the second phase and magnesium matrix. In the materials containing higher amounts of Ca, however, metallographic investigation shows that Ca added to Mg–Al–Zn can obviously decrease the size of β-Mg17Al12 and forms Al4Ca intermetallic compounds in the shape of bone-like morphology. The corrosion tests used include constant immersion technique, and potentiodynamic polarization experiments and salt spray test. Surface examination and analytical studies were carried out using optical and scanning electron microscopy, EDX, and XRD. The results of corrosion tests show that magnesium alloy Mg–Al–Zn with 1.0 wt% Ca addition has the best corrosion resistance behavior. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005957/abstract [article] The effect of Ca on corrosion behavior of heat-treated Mg–Al–Zn alloy [texte imprimé] / Y.-Q. Wang, Auteur ; M.-Z. Li, Auteur ; C. Li, Auteur . - 2012 . - pp. 497–504. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 497–504 Mots-clés : Ca;  corrosion;  magnesium  alloy;  microstructure Résumé : The effect of 0.5, 1.0, and 1.5 wt% Ca additions on the microstructure and corrosion resistance of the heat-treated Mg–Al–Zn alloy was investigated. Addition of 0.5 wt% Ca did not form any new phase but suppressed the discontinuous precipitation of the β-Mg17Al12 phase by being dissolved in both the second phase and magnesium matrix. In the materials containing higher amounts of Ca, however, metallographic investigation shows that Ca added to Mg–Al–Zn can obviously decrease the size of β-Mg17Al12 and forms Al4Ca intermetallic compounds in the shape of bone-like morphology. The corrosion tests used include constant immersion technique, and potentiodynamic polarization experiments and salt spray test. Surface examination and analytical studies were carried out using optical and scanning electron microscopy, EDX, and XRD. The results of corrosion tests show that magnesium alloy Mg–Al–Zn with 1.0 wt% Ca addition has the best corrosion resistance behavior. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005957/abstract