J. Mater. Sci. Technol. ›› 2021, Vol. 64: 66-72.DOI: 10.1016/j.jmst.2019.09.031

• Research Article • Previous Articles     Next Articles

Doublely-doped Mg-Al-Ce-V2O7 4- LDH composite film on magnesium alloy AZ31 for anticorrosion

Liang Wua,b,*(), Xingxing Dinga, Zhicheng Zhenga, Aitao Tang, Gen Zhanga, 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:2019-05-15 Accepted:2019-09-23 Published:2021-02-20 Online:2021-03-15
  • Contact: Liang Wu
  • About author:*. College of Materials Science and Engineering,Chongqing University, Chongqing, 400044, China.E-mail address: wuliang@cqu.edu.cn (L. Wu).

Abstract:

A doublely-doped layered double hydroxide (LDH) film was produced on an anodized magnesium alloy AZ31. The Ce-doped Mg-Al LDH film was prepared by in-situ hydrothermal treatment method, and the intercalation of vanadate was realized by ion-exchange reaction. The structure, morphology and composition of as-prepared LDH film were investigated by X-ray diffractometer, field-emission scanning electronic microscope and energy dispersive spectrometry. Results indicated that a uniform and compact LDH film was formed and the intercalation of Ce 3+ and vanadate would change the crystal structure of LDHs. The results of the potentiodynamic polarization, electrochemical impedance spectra, hydrogen evolution and corrosion weight loss tests showed the Ce 3+ and vanadate anions significantly improve the impedance of LDH film, and the active double-doped LDH film could effectively protect the magnesium substrate from corrosion.

Key words: Magnesium alloy, Doublely-doped LDH film, Vanadate, Cerium, Anticorrosion