J. Mater. Sci. Technol. ›› 2022, Vol. 130: 12-26.DOI: 10.1016/j.jmst.2022.03.039

• Research Article • Previous Articles     Next Articles

Development of metal-organic framework (MOF) decorated graphene oxide/MgAl-layered double hydroxide coating via microstructural optimization for anti-corrosion micro-arc oxidation coatings of magnesium alloy

Yanning Chena,b, Liang Wua,b,*(), Wenhui Yaoa,b, Jiahao Wua,b, Jianpeng Xianga,b, Xiaowei Daia,b, Tao Wua,b, Yuan Yuana,b, Jingfeng Wanga,b, Bin Jianga,b, Fusheng Pana,b   

  1. aCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
    bNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
  • Received:2021-12-30 Revised:2022-03-11 Accepted:2022-03-15 Published:2022-12-10 Online:2022-12-07
  • 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:

An efficient and simple in-situ growth strategy has been discovered for the preparation of highly reproducible and continuous symbiotic ZIF-8-based anticorrosion coating by using graphene oxide (GO)/MgAl-NO3 layered double hydroxides (G/LDHs) buffer layer as a new type of connecting carrier based on micro-arc oxide (MAO) coating of AZ31 magnesium alloy. The components of ZIF-8 were adsorbed and bounded to the surface of the G/LDHs buffer layer-modified substrates to promote the nucleation of ZIF-8, thus growing a phase-pure, uniform, and good symbiosis ZIF-8 membrane. ZIF-8 particles with different growth times compensate for the grain boundary defects of the G/LDHs coating precursor buffer layer to different degrees. The prepared ZIF-8-based coating has excellent stability and corrosion resistance. The results demonstrate that the G/LDHs buffer layer provides a new channel for the MOF-modified MAO substrate of AZ31 magnesium alloy. It also proves that it is feasible to build high-performance anticorrosive coatings with MOF materials.

Key words: Zeolitic-imidazole framework, Layered double hydroxide, Graphene oxide, Micro-arc oxidation, Corrosion protection, Magnesium alloy