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The potential sensor is the key element and the major obstacle to realizing corrosion monitoring and control of the infrastructures in civil engineering. A novel solid-state potential sensor is prepared by the electron-beam physical vapor deposition technique. The phase composition of the oxidation film is investigated by X-ray diffraction. Also, the montmorillonite material with three-dimensional layered structure is used as the carrier material to prepare the conductive layer of the potential sensor. Furthermore, the potential stability of the sensor is verified in the simulated concrete pore solution. The results indicate that the potential sensor based on NiFe2O4 film is suitable to assembling the corrosion monitoring and control systems in civil engineering.