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.
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