Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (11): 1893-1908.DOI: 10.1007/s40195-023-01600-0

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Protective Coatings Containing ZnMOF-BTA Metal-Organic Framework for Active Protection of AA2024-T3

Izuchukwu K. Nwokolo1,2, Hongwei Shi1,2,3(), Paul C. Uzoma4, Sharjeel Ahmed1,2, Jiwen Li1,2, Fuchun Liu1,2,5()   

  1. 1CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    2School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
    3School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China
    4ZJU-UIUC Institute, International Campus, Zhejiang University, Haining, 314400, China
    5Institute of Corrosion Science and Technology, Guangzhou, 510530, China
  • Received:2023-05-14 Revised:2023-06-30 Accepted:2023-07-23 Online:2023-11-10 Published:2023-09-19
  • Contact: Hongwei Shi, hwshi@imr.ac.cn; Fuchun Liu, fcliu@imr.ac.cn

Abstract:

ZnMOF-BTA, a new metal-organic framework with excellent anti-corrosion properties was prepared and characterized. Polarization and immersion tests in 3.5 wt% NaCl were performed on AA2024-T3 alloy to assess the corrosion inhibition ability of ZnMOF-BTA. It showed an inhibition efficiency of more than 90%, indicating excellent corrosion inhibition of ZnMOF-BTA on AA 2024-T3 in NaCl. Moreover, ZnMOF-BTA particles were incorporated into polyurethane coatings to create corrosion-resistant coatings. Electrochemical tests and neutral salt spray analysis were used to assess the corrosion protection ability of ZnMOF-BTA-laden polyurethane coatings. The results of electrochemical impedance spectra clearly showed the outstanding corrosion resistance and durability of ZnMOF-BTA coatings after 1440 h of immersion with a high pore resistance (Rpo) of 1.76 × 1010 Ω cm2. In addition, during the cross-cut adhesion test, the coating did not detach from the substrate, and after the impact test, there was scarcely any indication of a fracture, which further supports the notion that the coating has strong adhesion to the substrate.

Key words: Aluminum alloy, Benzotriazole, Corrosion inhibition, Electrochemical impedance spectroscopy (EIS), Metal-organic framework, Organic coatings