中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 9 September 2023 |
（1. National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China;
3. School of Mechanical and Mining Engineering, The University of Queensland, Brisbane Qld 4072, Australia）
Abstract:In order to improve the corrosion resistance of AZ31 magnesium (Mg) alloy and the adhesion of metal-organic frameworks (MOFs) coating, a MAO/ZIF-67 (Co-based MOFs) (micro arc oxide/ZIF-67) composite coating was fabricated by in-situ growth on AZ31 MAO coating. The results showed that ZIF-67 with rhombic dodecahedron uniformly grew on the surface of MAO coating, and exhibited good adhesion to the substrate, which made MAO/ZIF-67 composite coating have good corrosion resistance. It was proved that ZIF-67 could effectively seal the pores of MAO coating, increase the tortuosity of the invasion path of corrosion medium, and significantly improve the corrosion resistance of Mg alloy. In addition, MAO pretreatment gave the coating strong adhesion, which was more conducive to ZIF-67 sealing micro-pores. This study is of great significance to reduce the limitation of MOF coating applied to all metal substrates.
Key words: metal-organic framework; ZIF-67; micro-arc oxidation; anticorrosion; coating; Mg-Al-Zn alloy
