Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (12): 49-52.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Optimization of Plasma Electrolytic Oxidation Process and Corrosion Resistance of Oxide Coatings

Chen Li  Peng Jia-zhi  Yan Zong-cheng  Wang Hong-lin  Wang Li   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-01-20 Revised:2009-03-05 Online:2009-12-25 Published:2009-12-25
  • Contact: 陈砺（1958-），男，教授，博士牛导师，主要从事绿色化学与可再生资源研究． E-mail:celichen@mail．scut．edu．cn
  • About author:陈砺（1958-），男，教授，博士牛导师，主要从事绿色化学与可再生资源研究．
  • Supported by:

    广东省科技计划项目（2005850101001）

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Abstract:

:In order to optimize the plasma electrolytic oxidation （PEO） process of AZ31 magnesium alloy and investigate the corrosion resistance of the prepared ceramic coatings in terms of electrochemical kinetics, the Taguchi method was used to perform an orthogonal test in terms of four factors （namely, Na2SiO3 concentration, KOH concentration, electrolytic oxidation voltage and time） and three levels, and the corrosion resistance of the PEO ceramic coatings was evaluated by scanning the potentiodynamic polarization curve. It is found that the three levels in the Taguchi orthogonal array all significantly influence the corrosion resistance, and KOH mass concentration is a major affecting factor; and that, when the PEO is performed with 20g/L Na2SiO3 and 4g/L KOH at 300 V for 40rain, the ceramic coatings are of the highest corrosion resistance.

Key words: plasma electrolytic oxidation, Taguchi method, ceramic coating, AZ31 magnesium alloy