J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (12): 1157-1162.

• Mechanical and Functional Properties of Materials • Previous Articles     Next Articles

Corrosion Behavior of Mg-Zn-Y Alloy with Long-period Stacking Ordered Structures

Jinshan Zhang, Jidong Xu, Weili Cheng, Changjiu Chen, Jingjing Kang   

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2012-02-11 Revised:2012-06-23 Online:2012-11-12 Published:2012-11-23
  • Contact: Jinshan Zhang
  • Supported by:

    the National Natural Science Foundation of China (No. 50571073), the Ph.D. Programs Foundation of Ministry of Education of China (No. 20111402110004) and the Natural Science Foundation of Shanxi Province, China (No. 2009011028-3)

Abstract:

Mg-Zn-Y alloys with long-period stacking ordered structures were prepared by an ingot casting method. The corrosion performance of Mg-Zn-Y alloys was studied by combining gas-collecting test, immersion test and electrochemical measurements in order to determine the corrosion rate and mechanism of the alloys. The results showed that the volume fraction of Mg12YZn phase increased and the shape of the Mg12YZn phase changed from discontinuous to continuous net-like with increasing Zn and Y content. The corrosion rate of the alloys greatly depended on the distribution and volume fraction of the Mg12YZn phase. Corrosion products appeared at the junction of Mg phase and Mg12YZn phase, indicating that the Mg12YZn phase accelerated 
galvanic corrosion of Mg matrix. Mg97Zn1Y2 alloy shows the lowest corrosion rate due to the continuous distribution of Mg12YZn phase.

Key words: Mg-Zn-Y alloy, Long-period stacking ordered (LPSO) structure, Micro-galvanic corrosion, Mg12YZn phase, Corrosion behavior