Optimal conditions for the deposition of novel anticorrosive coatings by RF magnetron sputtering for aluminum alloy AA6082
Por:
Brachetti-Sibaja S.B., Domínguez-Crespo M.A., Rodil S.E., Torres-Huerta A.M.
Publicada:
5 dic 2014
Resumen:
Cerium and lanthanum coatings were deposited on glass, silicon (100),
and aluminum alloy by RF magnetron sputtering in which several
experimental conditions such as power, substrate temperature, and
deposition time were varied, using pure CeO2 and La2O3 targets. The
effect of deposition parameters on the bonding structure, surface
morphology and properties against corrosion of rare earth (RE) coatings
formed on metallic substrate was reported. The microstructure and
chemistry of the thin film were characterized by X-ray diffraction
(XRD), Scanning Electron Microscopy (SEM), and X-ray photoelectron
spectroscopy (XPS); whereas their use as corrosion resistant coatings
was studied in aqueous NaCl solution (3.0 wt%) by using polarization
curves. Variations in these properties were observed by increasing the
substrate temperature which modifies the crystallinity of the rare earth
coatings. XRD and XPS findings indicate that the cerium coatings are
composed by CeO2 and a significant quantity of Ce2O3 due to oxygen
deficiency in the sputtering chamber, whereas La2O3/La(OH)(3) and some
La intermetallic compounds are detected in the lanthanum films.
Variations in the E-corr and I-corr were found as a function of the
thickness, texture, and morphology of the as-prepared coatings. (C) 2014
Elsevier B.V. All rights reserved.
Filiaciones:
Brachetti-Sibaja S.B.:
Instituto Politécnico Nacional, CICATA-Unidad Altamira, Mexico
Instituto Tecnológico de Cd. Madero, Cd. Madero, Tamaulipas, Mexico
Domínguez-Crespo M.A.:
CICATA-Altamira, Instituto Politécnico Nacional, IPN Km 14.5 Carretera Tampico-Puerto Industrial Altamira, C.P., Altamira, Tamaulipas, 89600, Mexico
Rodil S.E.:
Univ Nacl Autonoma Mexico, IIM, Mexico City 04510, DF, Mexico
Torres-Huerta A.M.:
Instituto Politécnico Nacional, CICATA-Unidad Altamira, Mexico
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