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Chin J Mater Res  2009, Vol. 23 Issue (4): 421-425    DOI:
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Microstructure and corrosion resistance of composite coating on magnesium alloy by microarc oxidation and electrophoresis
YANG Wei;  JIANG Bailing;  SHI Huiying;  XIAN Linyun
School of Material Science and Engineering; Xi'an University of Technology; Xi'an 710048
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YANG Wei JIANG Bailing SHI Huiying XIAN Linyun. Microstructure and corrosion resistance of composite coating on magnesium alloy by microarc oxidation and electrophoresis. Chin J Mater Res, 2009, 23(4): 421-425.

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Abstract  

Microarc oxidation (MAO) coatings on magnesium alloy were prepared in silicate electrolyte under constant voltage mode. Cross-section morphologies, binding force and corrosion resistance of the coatings treated by micro arc oxidation and electrophoresis or direct electrophoresis were studied, respectively. The results show that electrophoresis coating can be prepared on the surface of MAO coating, and this technique is simpler than the traditional electrophoresis. The forces of physical binding and chemical bonding of the composite coatings were formed, and the grade of binding force is NO.1. The corrosion weight and surface morphology of the composite coatings are not changed under the neutral salt spray test for 800 h. The electrochemical stability of the microarc oxidation and electrophoresis coating is better, and corrosion current is decreased by 5 or 2 grades compared by the ceramic coating or direct electrophoresis coating.
Key words:  metal materials      microarc oxidation and electrophoresis      composite coating      microstructure      corrosion resistance     
Received:  12 December 2008     
ZTFLH: 

TG174

 
  TB304

  
Fund: 

Support by National Key Technologies R\&D Program No.2006BAE04B05-1.
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https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2009/V23/I4/421

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