Preparation of MOF-based superhydrophobic composite coatings with anti-corrosion and self-cleaning properties

To enhance the resistance to corrosion of metals, a hierarchically structured superhydrophobic coating fabricated from MOF(ZIF-67) nanoparticles and polyurethane resin was created. The ZIF-67 nanoparticles were modified by dodecyltrimethoxysilane (DTMS) and lauric acid (LA), and the superhydrophobic composite coating was prepared using the spraying method. The prepared ZIF-67/DTMS/LA/PU superhydrophobic composite coatings exhibited excellent hydrophobicity (WCA = 157.5°), self-cleaning, and corrosion resistance and remained superhydrophobic after 12 days of immersion in 3.5 wt% NaCl solution. It is noteworthy that after being immersed in a 3.5 wt% NaCl solution for 168 h, the impedance modulus of the ZIF-67/DTMS/PU coating still exceeded the initial impedance modulus of the 7075aluminum alloy after immersion, indicating that the ZIF-67/DTMS/PU coating can provide long-term protection for the aluminum alloy. The coating offers a broad range of potential applications due to its exceptional corrosion resistance, anti-icing, and self-cleaning qualities.