J. Mater. Sci. Technol. ›› 2021, Vol. 64 ›› Issue (0): 10-20.DOI: 10.1016/j.jmst.2019.10.007

• Research Article • Previous Articles     Next Articles

Effects of deformation processes on morphology, microstructure and corrosion resistance of LDHs films on magnesium alloy AZ31

Jing Chena, Liang Wu*(), Xingxing Dinga, Qiang Liua, Xu Daia, Jiangfeng Song, Bin Jiang, Andrej Atrensc, Fusheng Pan*()   

  1. aCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
    bNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
    cSchool of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Qld, 4072, Australia
  • Received:2019-06-29 Accepted:2019-10-21 Online:2021-02-20 Published:2021-03-15
  • Contact: Liang Wu,Fusheng Pan
  • About author:fspan@cqu.edu.cn (F. Pan).
    * College of Materials Science and Engineering,Chongqing University, Chongqing 400044, China.E-mail addresses: wuliang@cqu.edu.cn (L. Wu)

Abstract:

Highly oriented Mg-Al layered double hydroxide (LDHs) films were deposited on magnesium alloy AZ31 with different deformation processes by an easy in-situ growth method. The characteristics of the films were investigated by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical, immersion and hydrogen evolution tests. The corrosion protection performance ranked the LDHs films as the increasing series: CS-LDHs (as-cast sample with LDHs) < AE-LDHs (asymmetric extrusion sample with LDHs) < SE-LDHs (symmetric extrusion sample with LDHs) < RS-LDHs (rolled sample with LDHs). A thicker and more compact LDH conversion coating was formed on the RS sample, and had the best corrosion protection performance.

Key words: AZ31, Microstructure, LDHs films, Corrosion resistance, Deformation processes