Corrosion behavior of as-cast Mg–8Li–3Al+xCe alloy in 3.5wt% NaCl solution
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第10期
论文作者：S.Manivannan P.Dinesh R.Mahemaa S.P.Kumaresh Babu Srinivasan Sundarrajan
文章页码：1196 - 1203
摘 要：Mg–8Li–3Al+xCe alloys（x = 0.5wt%, 1.0wt%, and 1.5wt%） were prepared through a casting route in an electric resistance furnace under a controlled atmosphere. The cast alloys were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The corrosion behavior of the as-cast Mg–8Li–3Al+xCe alloys were studied under salt spray tests in 3.5wt% NaC l solution at 35°C, in accordance with standard ASTM B–117, in conjunction with potentiodynamic polarization（PDP） tests. The results show that the addition of Ce to Mg–8Li–3Al（LA83） alloy results in the formation of Al2Ce intermetallic phase, refines both the α-Mg phase and the Mg17Al12 intermetallic phase, and then increases the microhardness of the alloys. The results of PDP and salt spray tests reveal that an increase in Ce content to 1.5wt% decreases the corrosion rate. The best corrosion resistance is observed for the LA83 alloy sample with 1.0wt% Ce.
S.Manivannan1，P.Dinesh1，R.Mahemaa1，S.P.Kumaresh Babu1，Srinivasan Sundarrajan1
1. Department of Metallurgical and Materials Engineering, National Institute of Technology
摘 要：Mg–8Li–3Al+xCe alloys（x = 0.5wt%, 1.0wt%, and 1.5wt%） were prepared through a casting route in an electric resistance furnace under a controlled atmosphere. The cast alloys were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The corrosion behavior of the as-cast Mg–8Li–3Al+xCe alloys were studied under salt spray tests in 3.5wt% NaC l solution at 35°C, in accordance with standard ASTM B–117, in conjunction with potentiodynamic polarization（PDP） tests. The results show that the addition of Ce to Mg–8Li–3Al（LA83） alloy results in the formation of Al2Ce intermetallic phase, refines both the α-Mg phase and the Mg17Al12 intermetallic phase, and then increases the microhardness of the alloys. The results of PDP and salt spray tests reveal that an increase in Ce content to 1.5wt% decreases the corrosion rate. The best corrosion resistance is observed for the LA83 alloy sample with 1.0wt% Ce.
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