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http://dx.doi.org/10.4191/kcers.2012.49.6.498

Influence of the Electrical Parameters on the Fabrication of Oxide Layers on the Surface of Al-1050 by a Plasma Electrolytic Process  

Nam, Kyung-Su (Department of Materials Engineering, Graduate School of PaiChai University)
Song, Jeong-Hwan (Department of Information and Electronic Materials Engineering, PaiChai University)
Lim, Dae-Young (Department of Information and Electronic Materials Engineering, PaiChai University)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.6, 2012 , pp. 498-504 More about this Journal
Abstract
Oxide layers were prepared by an environmentally friendly plasma electrolytic oxidation (PEO) process on an Al-1050 substrate. The electrolyte for PEO was an alkali-based solution with $Na_2SiO_3$ (8 g/L) and NaOH (3 g/L). The influence of the electrical parameters on the phase composition, microstructure and properties of the oxide layers formed by PEO were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The voltage-time responses were recorded during various PEO processes. The oxides are composed of two layers and are mainly made of ${\alpha}$-alumina, ${\gamma}$-alumina and mullite phases. The proportion of each phase depends on various electrical parameters. It was found that the surface of the oxides produced at a higher current density and Ia/Ic ratio shows a more homogeneous morphology than those produced with the electrical parameters of a lower current density and lower Ia/Ic ratio. Also, the oxide layers formed at a higher current density and higher Ia/Ic ratio show high micro-hardness levels.
Keywords
PEO; ${\alpha}$-alumina; Al; Surface treatment; Electrical parameter;
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