J. Mater. Sci. Technol. ›› 2021, Vol. 92: 214-224.DOI: 10.1016/j.jmst.2021.04.005

• Research Article • Previous Articles     Next Articles

Deteriorated corrosion performance of micro-alloyed Mg-Zn alloy after heat treatment and mechanical processing

Yiming Jina,b,*(), Carsten Blawertc, Hong Yangd,e,*(), Björn Wiesea, Jan Bohlenc, Di Meic, Min Dengc, Frank Feyerabenda, Regine Willumeita,f   

  1. aDivision of Metallic Biomaterials, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
    bSouthwest Technology and Engineering Research Institute, 400039 Chongqing, China
    cMagnesium Innovation Center, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
    dState Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China
    eNational Engineering Research Center for Magnesium Alloys, Chongqing University, 400044 Chongqing, China
    fFaculty of Engineering, Christian-Albrechts-Universität zu Kiel, 24143 Kiel, Germany
  • Received:2020-07-24 Revised:2021-04-11 Accepted:2021-04-13 Published:2021-11-30 Online:2021-05-09
  • Contact: Yiming Jin,Hong Yang
  • About author:hong.yang@cqu.edu.cn (H. Yang).
    * E-mail addresses: jimmyyo@126.com (Y. Jin),

Abstract:

The corrosion performances of the as-cast and solution-treated Mg-0.5Zn samples were investigated in 0.9% NaCl solution and compared. From the electrochemical measurement results and corrosion morphology observations, it is found that the corrosion resistance of Mg-0.5Zn deteriorated with the extension of solution treatment duration. The main reason was the formation of Fe-Si precipitates with higher Fe concentrations during heat treatment. The Fe-Si precipitates, especially the ones with high Fe contents influenced the corrosion initiation and propagation significantly. In regard of corrosion performance, the solution-treated and then extruded sample was also performing not as good as the cast and then directly extruded sample.

Key words: Magnesium, Alloy, Intermetallics, SEM, Inclusions, Corrosion