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Materials 2018, 11(7), 1114; https://doi.org/10.3390/ma11071114

Fabrication of Sputtered Ce/La, La/Ce Oxide Bilayers on AA6061 and AA7075 Aluminum Alloys for the Development of Corrosion Protective Coatings

1
Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira. km 14.5 Carr. Tampico-Puerto Industrial Altamira, Altamira 89600, Mexico
2
TecNM, Instituto Tecnológico de Ciudad Madero, Ave. Primero de Mayo s/n, Col. Los Mangos 89440, Mexico
3
UNAM, Instituto de Investigaciones en Materiales, Circuito Exterior s/n C.U., Coyoacán 04510, Mexico
4
Conacyt-Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Altamira km 14.5 Carr. Tampico-Puerto, Industrial Altamira, Altamira 89600, Mexico
5
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 86205, Mexico
*
Author to whom correspondence should be addressed.
Received: 29 May 2018 / Revised: 15 June 2018 / Accepted: 25 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Thin Film Fabrication and Surface Techniques)
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Abstract

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. View Full-Text
Keywords: magnetron sputtering; rare earth; corrosion; thin film; bilayer; CeO2; La2O3; cerium oxide; lanthanum oxide magnetron sputtering; rare earth; corrosion; thin film; bilayer; CeO2; La2O3; cerium oxide; lanthanum oxide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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. Fabrication of Sputtered Ce/La, La/Ce Oxide Bilayers on AA6061 and AA7075 Aluminum Alloys for the Development of Corrosion Protective Coatings. Materials 2018, 11, 1114.

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