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Vol. 26 No. 24 (2014)

Copyright (c) 2014 Tiancai Xu1, Xiaodong Peng1, Bao Zhang1, Junwei Jiang1, Xi Zhang1, Yuanfang Chen1

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Comparative Study on Microstructure and Corrosion Resistance of Mg-Al Based Alloy with Mn and Sr Addition

https://doi.org/10.14233/ajchem.2014.17013
Tiancai Xu1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China 2Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044, P.R. China 3College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, P.R. China *Corresponding author: Tel/Fax: +86 23 65111625, E-mail: 737770318@qq.com
Xiaodong Peng1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China 2Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044, P.R. China 3College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, P.R. China *Corresponding author: Tel/Fax: +86 23 65111625, E-mail: 737770318@qq.com
Bao Zhang1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China 2Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044, P.R. China 3College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, P.R. China *Corresponding author: Tel/Fax: +86 23 65111625, E-mail: 737770318@qq.com
Junwei Jiang1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China 2Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044, P.R. China 3College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, P.R. China *Corresponding author: Tel/Fax: +86 23 65111625, E-mail: 737770318@qq.com
Xi Zhang1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China 2Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044, P.R. China 3College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, P.R. China *Corresponding author: Tel/Fax: +86 23 65111625, E-mail: 737770318@qq.com
Yuanfang Chen1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China 2Engineering Research Center for Mg Alloys, Chongqing University, Chongqing 400044, P.R. China 3College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, P.R. China *Corresponding author: Tel/Fax: +86 23 65111625, E-mail: 737770318@qq.com

Corresponding Author(s) : Tiancai Xu1

Asian Journal of Chemistry, Vol. 26 No. 24 (2014)

Abstract

Magnesium alloys, including Mg-3Al-0.5Mn (AM30), Mg-3Al-0.5Sr (AJ30) and Mg-3Al-0.5Mn-0.5Sr (AMJ300), were designed and prepared in vacuum induction furnace under controlled argon atmosphere. The effects of minor Sr and Mn addition on the microstructure and corrosion resistance of the Mg-3Al (wt.%) alloy were investigated by light and scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and electrochemical testing. The results indicate that AM30 alloy is composed of a-Mg and Al11Mn14 phases, whereas the AJ30 alloy consists of a-Mg, Al4Sr and Mg17Sr2 phases. Beyond above phases, AMJ300 alloy is composed of Mn phase. The Sr addition refined the as-cast grain structure of Mg-3Al alloy and the grain refining effect of Sr is more pronounced than Mn addition at the same level. However, the addition of Sr is not as effective as the simultaneous addition of Sr + Mn for the refinement of grains. Compared to Sr, Mn improved the corrosion resistance of binary Mg-Al. Due to its smallest corrosion current density and corrosion rate, the corrosion resistance of AM30 alloy is proved the best. The highest corrosion rate was observed for AJ30 alloy. The main solid corrosion products were Mg(OH)2.

Keywords

Mg-Al alloys Mn addition Sr addition Grain refinement Corrosion resistance.
Xu1, T., Peng1, X., Zhang1, B., Jiang1, J., Zhang1, X., & Chen1, Y. (2014). Comparative Study on Microstructure and Corrosion Resistance of Mg-Al Based Alloy with Mn and Sr Addition. Asian Journal of Chemistry, 26(24), 8333–8338. https://doi.org/10.14233/ajchem.2014.17013
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