Surface coatings of super light magnesium-lithium alloys

Author: Lin H C   Wang P C   Wu T F   Lin M C   Yeh M T   Lin K M  

Publisher: Maney Publishing

ISSN: 1743-2847

Source: Materials Science and Technology, Vol.28, Iss.7, 2012-07, pp. : 799-803

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Abstract

The Mg-Li alloys with Li content of 5-11 mass-% will exhibit a dual phase structure of (hcp) and β (bcc) phases. These dual phase Mg-Li alloys have excellent formability, as well as extra low density. However, the Mg-Li alloys still have disadvantages of poor corrosion and wear resistance. In the present study, the AlN films deposited on Mg-Li alloy by radio frequency magnetron sputtering were investigated. The microstructure, surface morphology and corrosion resistance of the AlN films were examined by means of X-ray diffraction, SEM, TEM, and potentiodynamic polarisation. Experimental results show that deposited AlN films exhibit an amorphous structure, which can effectively improve the corrosion resistance of Mg-Li alloy. Meanwhile, the sputtering parameters, such as the radiofrequency power and working pressure, are found to have significant effects on the corrosion behaviour of deposited AlN films on Mg-Li alloy.