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The micromagnetic field of magnetic materials can enhance the corrosion prevention performance as well as produce a synergistic effect with photogenerated carriers. The breakthrough of this coupling mechanism is crucial in marine anticorrosion applications. Herein, Co 3 O 4 nanorods were loaded on the graphite carbon nitride ( g -C 3 N 4 ) lamellae via thermal polymerization and the impregnation-annealing process to construct a Co 3 O 4 / g -C 3 N 4 heterojunction, which considerably widened the absorption range of visible light in the material and facilitated the efficient separation of photogenerated charge carriers. The material possesses a multilevel synergistic corrosion resistance: The built-in electric field of the heterojunction drives the directional migration of photogenerated electrons to inhibit the dissolution of the metal matrix. Meanwhile, magnetic Co 3 O 4 delays the corrosion rate by binding the anodic electron motion through magnetic polarizers. Furthermore, Co 2+ was released from the lattice to form Co(OH) 2 and CoCO 3 passivation films, which synergistically enhanced the shielding performance with a dense rust layer. Electrochemical impedance spectroscopy (EIS) tests showed that the anticorrosion performance of the Co 3 O 4 / g -C 3 N 4 heterojunction was 2.43 times that of epoxy resin. This study offers new strategies for advancement of multifunctional anticorrosion materials with both photoelectric response and magnetically induced protection.
Zhao et al. (Tue,) studied this question.