Metal–organic framework–carbon allotrope composites as emerging effective and superdurable nanofillers: progress in design and application

Metal–organic frameworks (MOFs) and carbon allotropes (CAs) are well-known high-performance and long-lasting nanofillers for polymer coatings. According to recent research, a suitable combination of MOFs and CAs (MOFCAs) enhances their nanofiller property synergistically. Because of their many advantages, including optimized hydrophobicity and the very high specific area, MOFCAs make excellent fillers and self-healing materials According to the findings of the literature review, the inhibition efficiencies and corrosion inhibition potential of MOFs and CAs are amplified in MOFCAs. MOFs improve the dispersibility of CAs in MOFACs and act as noncarriers for the loading of corrosion inhibitors. CAs, on the other hand, produce the labyrinth effect and avoid corrosive species diffusion and direct attacks. Overall, MOFCAs have a strong anticorrosive effect, and their presence in the polymer matrix increases charge transfer resistance while decreasing current density during the corrosion process. By preventing corrosive species diffusion, MOFCAs improve the anticorrosive effectiveness and durability of polymer coatings. The current review article discusses the advantages and disadvantages of using MOFCAs as fillers in polymer coatings. The anticorrosive mechanism of MOFCAs has also been proposed schematically based on ideas derived from literature studies.