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Chin J Mater Res  2009, Vol. 23 Issue (2): 220-224    DOI:
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Corrosion resistance property of micro–arc oxidation coatings on Mg–Li alloy obtained in different systems
SHI Lingling1;  XU Yongjun1;2;  LI Kang1;  YAO Zhongping1;  JIANG Zhaohua1
1.Department of Chemical Engineering; Harbin Institute of Technology; Harbin 150001
2.Key laboratory of super light materials and surface technology; Ministry of Education; Harbin Engineering University; Harbin 150001
Cite this article: 

SHI Lingling XU Yongjun LI Kang YAO Zhongping JIANG Zhaohua. Corrosion resistance property of micro–arc oxidation coatings on Mg–Li alloy obtained in different systems. Chin J Mater Res, 2009, 23(2): 220-224.

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Abstract  

Ceramic coatings were prepared on the surface of Mg–5%Li alloy in three kinds of optimized electrolytes by single-polar pulsed micro-arc oxidation (MAO). Thickness, microstructure, phase composition and corrosion resistance of the ceramic coatings were investigated. The results showed that all the MAO coatings were composed of MgO, and their corrosion resistance was improved distinctly. The coating gained in Na3PO4 system contained MgF3, and was the thickest with a great deal of cracks; the coating from Na2SiO3 system included olivine Mg2SiO4, and had the best pitting corrosion resistance; the coating from Na2SiO3–Na3PO4 system contained MgSiO3, showed the most compact micro-surface, and owned the best uniform corrosion resistance.

Key words:  materials failure and protection      Mg–Li alloy      micro–arc oxidation      ceramic coatings      corrosion resistance     
Received:  26 August 2008     
ZTFLH: 

TG174

 

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2009/V23/I2/220

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