학술논문
Effect of 0.45 wt.% Nd Addition on the Corrosion Resistance of Extruded Mg-6Al-3Sn-2Zn Alloy
Document Type
Original Paper
Author
Source
Journal of Materials Engineering and Performance. :1-12
Subject
Language
English
ISSN
1059-9495
1544-1024
1544-1024
Abstract
The effect of Nd microalloying on the microstructure and corrosion behavior of extruded Mg-6Al-3Sn-2Zn (ATZ632) alloys was investigated. The addition of Nd (0.45 wt.%) into the ATZ632 alloy resulted in the formation of a NdZn1.66 Al2.34 phase with a relatively low Volta potential of 68 ~ 78 mV. The polarization resistance of this alloy was calculated to be 564.33 ohm cm2 , which is approximately 7.7 times slower than that of the ATZ632 alloy. The main factors for improving the corrosion resistance of the extruded ATZ632 alloy with 0.45 wt.% Nd addition are: (1) the Nd2 O3 prevention of Cl− from passing through the corrosion film; (2) the formation of denser and more uniform corrosion films; and (3) the grain refinement and wakening of the (0001) base-plane texture.