J. Mater. Sci. Technol. ›› 2021, Vol. 91: 28-39.DOI: 10.1016/j.jmst.2021.03.011

• Research Article • Previous Articles     Next Articles

MgAl-V2O74- LDHs/(PEI/MXene)10 composite film for magnesium alloy corrosion protection

Yulong Wua, Liang Wu*(), Mikhail L. Zheludkevichc, Yanning Chena, Maria Serdechnovac, Wenhui Yaoa,b, Carsten Blawertc, Andrej Atrensd, Fusheng Pana,b   

  1. aState Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
    bNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
    cInstitute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck Str. 1, 21502 Geesthacht, Germany
    dSchool of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Qld 4072, Australia
  • Received:2020-12-14 Revised:2021-03-14 Accepted:2021-03-21 Published:2021-11-20 Online:2021-11-20
  • Contact: Liang Wu
  • About author:*Liang Wu,E-mail address: wuliang@cqu.edu.cn(L. Wu).

Abstract:

In this study, MgAl-V2O74- LDHs/(poly(ethyleneimine)(PEI)/MXene)n composite films were synthesized via (i) in-situ hydrothermal growth of Mg-Al layered double hydroxides (LDHs) on AZ31 alloy followed by vanadate intercalation reactions, and (ii) the as-prepared MgAl-V2O74- LDHs film was covered by layer-by-layer assembly using (PEI/MXene)n, where n=5, 10, and 20. Film characterization revealed that the outer layers (PEI/MXene) were assembled on the surface by electrostatic interaction and provided a good coverage of LDHs nanosheets. But, microcracks appeared gradually on the surface and destroyed the film integrity with increasing number of PEI/MXene layers. The corrosion tests indicated that the MgAl-V2O74- LDHs/(PEI/MXene)10 composite films provided a better corrosion protection ability than that of n=5 and 20. The outer layers (PEI/MXene) had a corrosion inhibition protective effect on MgAl-V2O74- LDHs film. This work opened a new perspective of the MXene materials for anticorrosion application via a layer-by-layer assembly method.

Key words: Magnesium alloys, Layered double hydroxides, Vanadate, Mxene, Layer-by-LayerCorrosion resistance