Formation and Properties of Oxide Coatings with Immobilized Zeolites Obtained by Plasma Electrolytic Oxidation of Aluminum

In this paper, we employed plasma electrolytic oxidation (PEO) of aluminum in a water solution of sodium tungstate (Na2WO4∙2H2O) with the addition of the pure and Ce-loaded zeolites clinoptilolite and 13 X for the preparation of oxide coatings. The obtained coatings were characterized with respect t...

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Bibliographic Details
Published in:Metals (Basel ) 2021-08, Vol.11 (8), p.1241
Main Authors: Mojsilović, Kristina, Lačnjevac, Uroš, Stojanović, Srna, Damjanović-Vasilić, Ljiljana, Stojadinović, Stevan, Vasilić, Rastko
Format: Article
Language:English
Subjects:
Aluminum oxide
Atomic force microscopy
Catalytic activity
Chemical composition
Coalescing
Corrosion
Electrodes
Electrolytes
Investigations
Morphology
Nanoparticles
Oxidation
Oxide coatings
Photocatalysis
plasma electrolytic oxidation
Scanning electron microscopy
Sodium tungstate
Substrates
Transitional aluminas
Zeolites
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Summary:In this paper, we employed plasma electrolytic oxidation (PEO) of aluminum in a water solution of sodium tungstate (Na2WO4∙2H2O) with the addition of the pure and Ce-loaded zeolites clinoptilolite and 13 X for the preparation of oxide coatings. The obtained coatings were characterized with respect to their morphologies and chemical and phase compositions using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, atomic force microscopy, and X-ray diffraction. The prepared coatings contained γ-alumina, WO3, and metallic tungsten. The surface morphologies of the obtained coatings strongly depended on the PEO processing time; the roughness of all coatings increased with PEO time, while porosity decreased with PEO processing time as a result of microdischarge coalescence and growth. All coatings contained elements originating from the substrate and from the electrolytes. Coatings containing zeolites with Ce showed higher photoactivity than those with immobilized pure zeolites. The highest photocatalytic activity levels were observed for coatings containing immobilized Ce-exchanged clinoptilolite processed for 10 min. It was observed that both clinoptilolite and 13X zeolites improved the features of the PEO coatings in a similar manner, making natural and abundant clinoptilolite an excellent candidate for various applications.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11081241