J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (11): 1016-1020.

• Research Articles • 上一篇    下一篇

Effects of current density on the microstructure and the corrosion resistance of alumina coatings embedded with SiC nano-particles produced by micro-arc oxidation

Yang Yue   

  1. Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, P.R. China
  • 收稿日期:2010-07-23 修回日期:2010-09-13 出版日期:2010-11-30 发布日期:2010-11-22
  • 通讯作者: Yang Yue

Effects of Current Density on the Microstructure and the Corrosion Resistance of Alumina Coatings Embedded with SiC Nano-particles Produced by Micro-arc Oxidation

Yue Yang1), Yaohui Liu2)   

  1. 1) Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, China
    2) Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025, China
  • Received:2010-07-23 Revised:2010-09-13 Online:2010-11-30 Published:2010-11-22
  • Contact: Yue Yang

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关键词: micro-arc oxidation, SiC nano-particles, Corrosion resistance

Abstract: To improve the surface corrosion resistance of the alumina films fabricated by micro-arc oxidation (MAO), Al2O3 coatings at di®erent current densities (5, 7 and 10 A/dm2) were produced on aluminum alloys by adding SiC nano-particles into electrolyte during MAO process. The morphology and phase composition of the coatings were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Furthermore, the corrosion performance of the coatings was evaluated via a three-electrode system in a 3.5 wt pct NaCl solution. From the obtained morphology of alumina coatings, it was believed that the Al2O3 coatings embedded with SiC nano-particles were formed. The electrochemical impedance spectroscopy (EIS) plots and potentiodynamic polarization plots of the Al2O3 coatings with and without SiC nano-particles at different current densities reveal that the Al2O3 coatings with SiC nano-particles formed at 10 A/dm2 showed the better corrosion resistance than the other coatings produced at 5 and 7 A/dm2.

Key words: Micro-arc oxidation, SiC nano-particles, Corrosion resistance