Ceria/stannate multilayer coatings on AZ91D Mg alloy (Articolo in rivista)

Type
Label
  • Ceria/stannate multilayer coatings on AZ91D Mg alloy (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.surfcoat.2012.05.075 (literal)
Alternative label
  • P. Bagala, F.R. Lamastra, S. Kaciulis, A. Mezzi, G. Montesperelli (2012)
    Ceria/stannate multilayer coatings on AZ91D Mg alloy
    in Surface & coatings technology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • P. Bagala, F.R. Lamastra, S. Kaciulis, A. Mezzi, G. Montesperelli (literal)
Pagina inizio
  • 4855 (literal)
Pagina fine
  • 4863 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 206 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 23 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma Tor Vergata, Dipartimento Ingn. Industriale, Rome, Italy Consorzio INSTM, Unita Ric. Roma Tor Vergata, Rome, Italy ISMN-CNR, Monterotondo Stazione, Rome, Italy (literal)
Titolo
  • Ceria/stannate multilayer coatings on AZ91D Mg alloy (literal)
Abstract
  • In this work, CeO2/stannate multilayer coatings on AZ91D magnesium alloy were successfully obtained by chemical conversion and sol-gel dip coating. The stannate conversion coatings were prepared from a stannate aqueous bath containing Na2SnO3, CH3COONa, Na3PO4 and NaOH at different temperatures and immersion times. Ceria films were produced on stannate/AZ91D starting from Ce(III) nitrate solutions in H2O. In some cases, the PVA was added as chelating agent. Ceria top coatings were fired at 200 degrees C for 1 h. Coating microstructure was examined by FE-SEM. Finally, the corrosion resistance features of the coatings were tested by the electrochemical impedance spectroscopy (EIS) in 3 wt.% NaCl solution. The effect of PVA addition was evaluated in terms of microstructure and corrosion resistance features. CeO2/stannate multilayer films, 31= thick, uniform, well adherent and nearly crack free were obtained. The formation of CeO2 phase was confirmed by XRD and XPS analyses. The XPS depth profiles showed a limited diffusion of Mg towards the ceramic film. The EIS tests showed a significant improvement of corrosion resistance of the multilayer coatings (similar to 16.6 k Omega after 48 h in NaCl solution) with respect to the blank alloy (similar to 2.4 k Omega after 48 h in NaCl solution). (literal)
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