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Journal of Applied Electrochemistry

, Volume 39, Issue 6, pp 913–920 | Cite as

Influence of heat treatment and microstructure on the corrosion of magnesium alloy Mg-10Gd-3Y-0.4Zr

  • Li-Ming Peng
  • Jian-Wei ChangEmail author
  • Xing-Wu Guo
  • Andrej Atrens
  • Wen-Jiang Ding
  • Ying-Hong Peng
Original Paper

Abstract

The corrosion of Mg alloy Mg-10Gd-3Y-0.4Zr, in the as-cast (F), solution treated (T4) and aged (T6) conditions, was investigated in 5% NaCl solution by immersion tests and potentiodynamic polarization measurements. The as-cast (F) condition had the highest corrosion rate due to micro-galvanic corrosion of the α-Mg matrix by the eutectic. Solution treatment led to the lowest corrosion rate, attributed to the absence of any second phase and a relatively compact protective surface film. Ageing at 250 °C increased the corrosion rate with increasing ageing time to 193 h attributed to increasing micro-galvanic corrosion acceleration of the Mg matrix by increasing amounts of the precipitates. Ageing for longer periods caused a decrease in the corrosion rate attributed to some barrier effect by a nearly continuous second-phase network. Electrochemical measurements did not give accurate evaluation of the corrosion rate in agreement with the immersion tests.

Keywords

Corrosion Heat treatment Mg-Gd-Y-Zr alloy Microstructure Potentiodynamic polarization curve 

Notes

Acknowledgements

This work was supported by Postdoctoral foundation of China (No. 20080430657), Program of Shanghai Subject Chief Scientist of China (No. 08XD14020) and National Basic Research Program of China (No. 2007CB613701). The authors would like to thank Dr. Yi-jian Lai of the Center of Analysis and Measurement of Shanghai Jiao Tong University for his help in observation of the corrosion products with Field Emission Scanning Electron Microscope (FE-SEM).

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Li-Ming Peng
    • 1
  • Jian-Wei Chang
    • 1
    • 2
    Email author
  • Xing-Wu Guo
    • 1
  • Andrej Atrens
    • 3
  • Wen-Jiang Ding
    • 1
  • Ying-Hong Peng
    • 2
  1. 1.National Engineering Research Center of Light Alloys Net Forming (LAF), School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina
  3. 3.Division of Materials, School of EngineeringThe University of QueenslandBrisbaneAustralia

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