Influence of surface pre-treatment on electrochemical properties of CeO2 thin films deposited by R.F. Sputtering on AA7075 aluminum alloy

S. B. Brachetti-Sibaja, M. A. Domínguez-Crespo, S. E. Rodil, A. M. Torres-Huerta

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Nanocrystalline CeO2 coatings were grown on AA7075 aluminum alloy substrates using RF magnetron sputtering and analyzed as protective barriers inhibiting the pitting corrosion reactions in chloride medium. Special attention was placed in the effect of alkaline and acid pretreatments on structural, morphological and electrochemical properties of CeO2 coatings. For this purpose, a CeO2 target under Ar atmosphere was used at room temperature employing different powers. The as-prepared films were characterized by Spectroscopic Ellipsometry (SE), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and electrochemical techniques such as polarization resistance (Rp) and potentiodynamic curves. The thickness of the as-deposited samples was quite different varying from 114 to 1575 nm for 40 and 120 W, respectively. The obtained coatings were composed of CeO2 particles with uniform, porous and crack-free film and the typical crystalline face centered cubic structure. The corrosion resistance of CeO2 coatings increases proportionally to the applied chemical pretreatment. Additionally, it was found that the electrochemical behavior has a direct relation with the pretreatment concentration but not with the thickness coatings.

Original languageEnglish
Title of host publication27th Congress of the Mexican Society of Electrochemistry, MES 2012/5th Meeting of the ECS Mexican Section
PublisherElectrochemical Society Inc.
Pages157-166
Number of pages10
Edition1
ISBN (Print)9781607684428
DOIs
StatePublished - 2013
Event27th Congress of the Mexican Society of Electrochemistry, MES 2012 and 5th Meeting of the ECS Mexican Section - Toluca, Mexico, Mexico
Duration: 11 Jun 201215 Jun 2012

Publication series

NameECS Transactions
Number1
Volume47
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

Conference27th Congress of the Mexican Society of Electrochemistry, MES 2012 and 5th Meeting of the ECS Mexican Section
Country/TerritoryMexico
CityToluca, Mexico
Period11/06/1215/06/12

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