NDLI: XPS and EIS studies of sputtered Al–Ce films formed on AA6061 aluminum alloy in 3.5% NaCl solution

Content Provider	Springer Nature Link
Author	Domínguez Crespo, M. A. Torres Huerta, A. M. Rodil, S. E. Brachetti Sibaja, S. B. Cruz, W. Flores Vela, A.
Copyright Year	2009
Abstract	X-ray photoelectron spectroscopy (XPS) was used to analyze the composition of films at different deposition parameters of sputtered Al-Ce coatings on AA6061 aluminum alloys. By means of electrochemical impedance spectroscopy (EIS) measurements, the protective character of these coatings was studied for 21 days of exposure in a 3.5 wt% NaCl solution and an attempt was made to establish the relationship between film thickness and chemical composition (Al/Ce, Ce$^{3}$/Ce$^{4+}$ ratios) of the surface before and after the electrochemical characterization. XPS studies revealed the presence of the Al$^{o}$, Al$_{2}$O$_{3}$, CeO$_{2}$ and Ce$_{2}$O$_{3}$ compounds, confirming that the sputtered Al-Ce films were deposited in the metallic form and thereafter were superficially oxidized under ambient conditions. The Al–Ce bonds were overlapped with the signal of cerium oxides. The transport phenomena in the oxide film or controlled diffusion process are strongly dependent on the deposition parameters and exposure time in the aggressive medium. It was also found that in the deposited samples at p$_{4}$P$_{200}$t$_{300}$, the film was still present after 21 days of exposure, although with visible cracks and erosion areas; however, the Ce$^{3}$/Ce$^{4+}$ ratio almost remained constant before and after the electrochemical characterization, which explained the barrier properties of these samples as compared with others at different deposition parameters.
Starting Page	639
Ending Page	651
Page Count	13
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	40
Issue Number	3
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-12-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	AA6061 Magnetron sputtering Coatings Corrosion properties Al–Ce films Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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