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Metals 2018, 8(4), 248; https://doi.org/10.3390/met8040248

The Effect of Cerium Ions on the Structure, Porosity and Electrochemical Properties of Si/Zr-Based Hybrid Sol-Gel Coatings Deposited on Aluminum

1
Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova c. 39, Ljubljana 1000, Slovenia
2
Department of Electrochemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Trg Marka Marulića 19, Zagreb 10000, Croatia
3
Laboratory for Environmental and Life Sciences, University of Nova Gorica, Vipavska cesta 13, Nova Gorica 5000, Slovenia
4
Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Av. J. B. Justo 4302, Mar del Plata 7600, Argentina
*
Author to whom correspondence should be addressed.
Received: 12 February 2018 / Revised: 26 March 2018 / Accepted: 3 April 2018 / Published: 7 April 2018
(This article belongs to the Special Issue Corrosion Inhibition)
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Abstract

This study was focused on the synthesis and characterization of Si/Zr-based hybrid sol-gel coatings with and without the addition of cerium(III) ions. The coatings were deposited on aluminum aiming to act as an effective and ecologically harmless alternative to toxic chromate coatings. The chemical composition, structure, thermal properties and porosity of the non-doped and Ce-doped coatings containing various Zr contents were examined by Raman spectroscopy and photothermal beam deflection spectroscopy. The corrosion properties of the coated aluminum substrates were studied using AC and DC electrochemical methods in 0.1 M NaCl electrolyte solution. Barrier and protecting properties of the coatings were monitored upon long-term immersion in chloride solution using electrochemical impedance spectroscopy. The effect of cerium ions was two-fold: on the formation of a more condensed Si−O−Zr network structure and on the formation of Ce-based deposits, which diminish the rate of cathodic reaction at the coating/metal interface. These effects acted synergistically and resulted in the creation of the coatings with effective barrier and active corrosion protection. View Full-Text
Keywords: aluminum; corrosion; hybrid sol-gel coatings; cerium nitrate; thermal properties; porosity aluminum; corrosion; hybrid sol-gel coatings; cerium nitrate; thermal properties; porosity
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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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Rodič, P.; Katić, J.; Korte, D.; Desimone, P.M.; Franko, M.; Ceré, S.M.; Metikoš-Huković, M.; Milošev, I. The Effect of Cerium Ions on the Structure, Porosity and Electrochemical Properties of Si/Zr-Based Hybrid Sol-Gel Coatings Deposited on Aluminum. Metals 2018, 8, 248.

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