Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influence of the Electrical Parameters on the Fabrication of Oxide Layers on the Surface of Al-1050 by a Plasma Electrolytic Process

플라즈마 전해 산화법에 의한 Al-1050 표면상의 산화막 제조에 미치는 전기적 변수의 영향

  • 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)
  • 남경수 (배재대학교 재료공학과) ;
  • 송정환 (배재대학교 정보전자소재공학과) ;
  • 임대영 (배재대학교 정보전자소재공학과)
  • Received : 2012.02.28
  • Accepted : 2012.07.11
  • Published : 2012.11.30
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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

References

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