Design Synthesis and Excellent Anticorrosion Properties\nof ZIF-8/ZnMoO<sub>4</sub> Heterojunction Nanomaterials

This study enhanced the corrosion\nprotection of zinc molybdate\n(ZnMoO<sub>4</sub>) in epoxy coatings by integrating ZIF-8 to form\na <i>Z</i>-type nano heterojunction. The heterojunction\nleveraged the light absorption properties of organic ligands within\nZIF-8 to significantly promote the excitation and separation efficiency\nof photogenerated carriers, thereby enhancing the photocathodic protection\ncapability of the coating. It also utilized a cocrosslinking curing\nprocess between the epoxy functional groups and the organic functional\ngroups of ZIF-8, resulting in a notable improvement in coating density.\nFurthermore, the metal–organic framework (MOF) effectively\nanchored the coating, preventing the recurrence of defects due to\nmolybdate dissolution, thus enhancing durability. In synergy with\nthe molybdate passivation film, it effectively hindered the corrosive\nattack of ions adsorbed on the metal substrate surface, thereby contributing\nto the suppression of chemical corrosion. Meanwhile, the compositing\nof MOF significantly enhanced the hydrophobicity of the material.\nExperimental data demonstrated that the impedance of the ZIF-8/ZnMoO<sub>4</sub> composite coating achieved a remarkable increase to 226.0\nand 208.3% compared to pure epoxy and ZnMoO<sub>4</sub> coatings,\nwhich provided insights into expanding the compatibility and synergistic\nprotective performance of molybdate-based corrosion-resistant materials\nby constructing heterojunctions between organic and inorganic materials.