Acta Metallurgica Sinica (English Letters) >
Influences of Ca and Y Addition on the Microstructure and Corrosion Resistance of Vacuum Die-Cast AZ91 Alloy
Received date: 2013-10-28
Revised date: 2013-09-19
Online published: 2014-10-16
The influences of Ca and Y additions on the microstructure and corrosion resistance of vacuum die-cast AZ91 alloys were investigated by optical microscope, electron scanning microscope, weight-loss test, and electrochemical corrosion experiment. The results indicate that the Ca or Ca and Y additions refined the microstructure and decreased the amount of Mg17Al12 phase on grain boundaries in the alloys. Meanwhile, the addition of Ca and Y led to the formation of network Al2Ca phase and rod-like Al2Y phase, improved the corrosion resistance of AZ91 magnesium alloy. Compared with AZ91 alloy, the corrosion rate of AZ91–1.5Ca–1.0Y alloy was decreased to 16.2%, and its corrosion current density was dropped by one order of magnitude after immersion in 3.5 wt% NaCl solution for 24 h.
Key words： AZ91 alloy; Ca and Y; Corrosion resistance; Microstructure; Polarization curve
Feng Wang , Jibao Li , Jing Liu , Dan Lv , Pingli Mao , Zheng Liu . Influences of Ca and Y Addition on the Microstructure and Corrosion Resistance of Vacuum Die-Cast AZ91 Alloy[J]. Acta Metallurgica Sinica (English Letters), 2014 , 27(4) : 609 -614 . DOI: 10.1007/s40195-014-0101-z
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