Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 504, Issue 2, Pages 377-381Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.05.120
Keywords
Magnesium alloy; Molten salt; Diffusion; Corrosion; Hardness
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Funding
- National Nature Science Foundation of China [50974088]
- Technology Innovation Engineering in Higher Education Institutions, China [707025]
- Shanghai Rising-Star Program [10QA1403400]
- Instrumental Analysis Center of Shanghai Jiao Tong University (IAC-SJTU)
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A continuous Mg-Al intermetallic coating was fabricated on an AZ91D Mg alloy in molten salts in the lower temperature range from 300 degrees C up to 400 degrees C. The coating consists of a single Mg17Al12 intermetallic layer or both Mg17Al12 and Mg2Al3 intermetallic layers, depending on the treatment temperature. In contrast to the conventional powder pack cementation process, active Al atoms can be formed at a lower temperature in molten salts, which contributes to the lower temperature formation of continuous intermetallic layers. The intermetallic layer markedly improves the hardness as well as the corrosion resistance of the AZ91D Mg alloy. Furthermore, the continuous intermetallic layer exhibits passive behaviour in 3.5 wt.% NaCl solution, which is attributed to the homogenously distributed intermetallic phases. (C) 2010 Elsevier B.V. All rights reserved.
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