Fabrication of Sputtered Ce/La, La/Ce Oxide Bilayers on AA6061 and AA7075 Aluminum Alloys for the Development of Corrosion Protective Coatings
Por:
Brachetti-Sibaja S.B., Domínguez-Crespo M.A., Torres-Huerta A.M., Rodil-Posada S.E., López-Oyama A.B., García-Zaleta D.S., Onofre-Bustamante E.
Publicada:
1 jul 2018
Categoría:
Materials science (miscellaneous)
Resumen:
This work provides a comparative study on the corrosion protection
efficiency of Ce, La films as well as Ce/La and La/Ce oxide bilayered
coatings deposited onto AA7075 and AA6061 substrates by the radio
frequency (RF) magnetron sputtering technique. The coating thickness
ranged approximately from 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 thickness ca. 390 nm and average roughness of 66 nm showed the best
corrosion protection properties in chloride medium as determined by
potentiodynamic curves and electrochemical impedance spectroscopy (EIS).
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 poorer than those featured
by La films.
Filiaciones:
Brachetti-Sibaja S.B.:
Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira, km 14.5 Carr. Tampico-Puerto Industrial Altamira, Altamira, Mexico
TecNM, Instituto Tecnológico de Ciudad Madero, Ave. Primero de Mayo s/n, Col., Los Mangos, Mexico
Domínguez-Crespo M.A.:
Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira, km 14.5 Carr. Tampico-Puerto Industrial Altamira, Altamira, Mexico
Torres-Huerta A.M.:
Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira, km 14.5 Carr. Tampico-Puerto Industrial Altamira, Altamira, Mexico
Rodil-Posada S.E.:
UNAM, Instituto de Investigaciones en Materiales, Circuito Exterior s/n C.U., Coyoacán, Mexico
López-Oyama A.B.:
Conacyt-Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira km 14.5 Carr. Tampico-Puerto, Industrial Altamira, Altamira, Mexico
García-Zaleta D.S.:
Universidad Juárez Autónoma de Tabasco, División Académica Multidisciplinaria de Jalpa de Méndez, Carr. Estatal Libre VHS-COM. km. 27+000 s/n Ranch, Ribera Alta, Jalpa de Méndez, Tabasco, Mexico
Onofre-Bustamante E.:
Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira, km 14.5 Carr. Tampico-Puerto Industrial Altamira, Altamira, Mexico
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