Electrochemical Behaviors of Die-Cast Mg-4Al-0.4Mn-Xpr (x=0, 1, 4) Alloys in NaCl Solution

Abstract:

The microstructures and electrochemical corrosion behaviors of die-cast Mg-4Al-0.4Mn-xPr (x=0, 1, 4 wt.%) alloys have been investigated. Electrochemical behaviors of all alloys are described by open circuit potential test, potentiodynamic polarization test and electrochemical impedance spectroscope in 3.5 wt.% NaCl solution. The results show that the α-Mg grain is refined and the continuous net β phase appears gradually with increasing the content of Pr in the Mg-4Al-0.4Mn alloys. Moreover, the β phase plays a role of galvanic cathode in AM40 alloy and corrosion barrier in Pr-containing alloys, respectively. Electrochemical measurements show that Pr can improve corrosion resistance of Mg-4Al-0.4Mn alloy in the 3.5 wt.% NaCl solution, and corrosion rate decreases with increasing Pr content.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 82-88
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.82
• Online since: May 2013
• Authors: Xiao Dong Niu, Wei Sun, Xin Qiu, Jian Meng, Jian An*
• Keywords: Electrochemical Corrosion, Impedance Spectroscopy, Magnesium Alloy

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