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Título del libro: Encyclopedia Of Aluminum And Its Alloys, Vols I And Ii Título del capítulo: Corrosion Protective Coatings: Fabrication of Sputtered CeO2-La2O3 and La2O3CeO2 Bilayers
This entry provides a comparative study on the corrosion protection
efficiency of Ce, La films as well as Ce/La- and La/Ce-bilayered
coatings deposited onto AA7075 and AA6061 substrates by the radio
frequency magnetron sputtering technique. The coating thickness ranged
from similar to 12 to 835 nm, which changed with the deposition
parameters and substrate composition. The relationship between
microstructure, roughness, and electrochemical performance is examined.
The reactivity and crystallinity of rare earth (RE) films can be
tailored by adjusting the sputtering parameters. Sputtered La films with
a thickness of similar to 390 nm and an average roughness of 66 nm
showed the best corrosion protection properties in chloride medium as
determined by potentiodynamic curves and electrochemical impedance
spectroscopy. The method to obtain RE-bilayered coatings, i.e., La/Ce or
Ce/La as well as the substrate composition and applied power,
conditioned their inhibition properties. The RE-bilayered coatings
displayed better barrier properties than Ce films, which were worser
than those featured by La films.
Entidades citadas de la UNAM:
Fuente:
ISBN: 9781466510814 Editorial: CRC PRESS-TAYLOR & FRANCIS GROUP