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Chin J Mater Res  2009, Vol. 23 Issue (6): 656-662    DOI:
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Interaction of heat-treatment and micro-arc oxidation on AZ91D magnesium alloys
MA Ying 1;2;  ZHANG Hongfeng 1;  HAO Yuan 1;  CHEN Tijun 1;  LI Yuandong 1;  CAO Wei 2
1.State Key Laboratory of Advanced Non-Ferrous Metal Materials; Lanzhou University of Technology; Lanzhou 730050
2.Faculty of Engineering; the University of Auckland; Auckland 1142; New Zealand
Cite this article: 

MA Ying ZHANG Hongfeng HAO Yuan CHEN Tijun LI Yuandong CAO Wei. Interaction of heat-treatment and micro-arc oxidation on AZ91D magnesium alloys. Chin J Mater Res, 2009, 23(6): 656-662.

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Abstract  

With the micro-arc oxidation process of AZ91D magnesium alloys going, the thickness of coatings increases gradually. The coarser the discharging channels and the ejecting deposition are, the rougher the coating surface is. The micro-cracks on coatings are resulted from the stress concentration in coatings. The amount and morphology of micro-cracks, surface roughness and growth rate of coatings
are improved after substrates have been treated with the solid-solution that also benefit to energy saving of the micro-arc oxidation process. The residual stresses are released during the aging treatment, and the coating morphology is kept almost unchanged in terms of the amount and morphology of micro-cracks. And the microstructure of substrates has not been changed after the micro-arc oxidation treatment. More magnesium elements in AZ91D have participated in the micro-arc oxidation reaction conducted in silicate electrolyte. And silicon elements from the electrolyte also have diffused into magnesium substrates at the same time.

Key words:  metallic materials       magnesium alloy       heat-treatment       micro-arc oxidation       coating       micro-crack     
Received:  04 March 2009     
ZTFLH: 

 

 
  TG174

 
Fund: 

Supported by National Key Basic Research and Development Program of China No.2007CB613700, Chun Hun Program of Ministry of Education of China No.Z2006-1-62002.

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2009/V23/I6/656

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