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| EFFECTS OF Sn ON MICROSTRUCTURES AND CORROSION RESISTANCE OF Mg-6Al -1.2Y-0.9Nd MAGNESIUM ALLOY |
| LI Xiaofeng; LI Quanan; CHEN Jun; ZHANG Qing; ZHANG Xingyuan |
| School of Materials Science and Engineering; Henan University of Science & Technology; Luoyang 471003 |
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Abstract Effects of Sn addition on corrosion rate of Mg-6Al-1.2Y-0.9Nd magnesium alloy in 3.5% NaCl solution were studied by the static mass-loss tests. The microstructures of the alloys were observed by optical microscope and the morphologies of corrosion surface were analyzed with scanning electron microscopy. The results indicated that with the addtion of 1% Sn, the crystal grain size of the Mg-6Al-1.2Y-0.9Nd magnesium alloy was obviously refined, the microstructure was more homogeneous. But when the addition of Sn is more than 1%, the precipitates increase and they cause the trend of coarsening and segregation. Furthermore, in NaCl solution the corrosion rate of Mg-6Al-1.2Y-0.9Nd magnesium alloy decreases firstly and then increases with the increase of Sn content. With the addtion of 1% Sn, the corrosion rate of the alloy was the lowest, and the corrosion resistance was improved remarkably.
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Received: 18 August 2008
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Corresponding Authors:
LI Quanan
E-mail: q-ali@163.com
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