Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/1009
Title: Characterization of Al[sbnd]W oxide coatings on aluminum formed by pulsed direct current plasma electrolytic oxidation at ultra-low duty cycles
Authors: Mojsilović, Kristina 
Tadić, Nenad B. 
Lačnjevac, Uroš
Stojadinović, Stevan 
Vasilić, Rastko 
Keywords: Aluminum;Duty- cycle;Oxide coatings;Plasma electrolytic oxidation
Issue Date: 15-Apr-2021
Journal: Surface and Coatings Technology
Abstract: 
The growth of thin oxide coatings on the aluminum substrate in water-based sodium tungstate electrolyte by plasma electrolytic oxidation (PEO) is discussed and experimentally illustrated. The growth is carried out using a distinctive ultra-low duty cycle pulsed direct current (DC) power supply. During the PEO processing elements present in micro-discharges are identified using standard optical emission spectroscopy (OES) technique. The spectral line shape analysis of the first two hydrogen Balmer lines shows the presence of two types of micro-discharges. Obtained coatings are also characterized with respect to their morphology and chemical and phase composition. It is shown that coatings are composed of Al, O, and W, featuring low roughness and porosity. Partial crystallization of the coatings resulted in identification of WO3, W3O8, and γ-Al2O3 crystalline phases.
URI: https://physrep.ff.bg.ac.rs/handle/123456789/1009
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2021.126982
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