Influence of the electrodeposition current regime on the corrosion resistance of Zn–CeO2 nanocomposite coatings

The present work aims at studying the influence of the current regime on the electrodeposition of zinc–ceria composite coatings obtained from a chloride based electrolyte, by using both direct and pulse current electrodeposition techniques. The microstructure, microhardness, composition profile and...

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Bibliographic Details
Published in:Surface & coatings technology 2014-08, Vol.252, p.102-107
Main Authors: Nemes, Patrick Ioan, Lekka, Maria, Fedrizzi, Lorenzo, Muresan, Liana Maria
Format: Article
Language:English
Subjects:
Applied sciences
Chlorides
Coatings
Corrosion
Corrosion environments
Corrosion prevention
Corrosion resistance
Cross-disciplinary physics: materials science
rheology
Direct and pulse current
Electrodeposition
Exact sciences and technology
Materials science
Metallic coatings
Metals. Metallurgy
Microhardness
Nonmetallic coatings
Physics
Production techniques
Protective coatings
Surface treatment
Surface treatments
Zinc
Zn–CeO2 composite coatings
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Summary:The present work aims at studying the influence of the current regime on the electrodeposition of zinc–ceria composite coatings obtained from a chloride based electrolyte, by using both direct and pulse current electrodeposition techniques. The microstructure, microhardness, composition profile and the corrosion parameters of the samples were evaluated via SEM, GDOES, microhardness tests and polarization curves, respectively. Pure zinc samples obtained under the same experimental conditions were used as a reference. The addition of CeO2 nanoparticles leads to finer grained deposits, with better corrosion resistant properties. The study also revealed that a pulsed-current regime is preferable to a direct-current approach of the electro-co-deposition process, leading to coatings with better anti-corrosion properties. •Zn–CeO2 samples were obtained via direct current and pulse current electrodeposition.•Composite Zn–CeO2 coatings are more resistant to generalized corrosion than Zn coating.•GDOES analysis shows the presence of ceria nanoparticles in the depth of the coating.•Use of pulsed current, together with the presence of nanoparticles, offers compact deposits.•The presence of nanoparticles in the coating increases microhardness.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.04.051