In Situ Deposition 2D/3D rGO‐SiO2 Heterostructure Synergic Corrosion Inhibitor: Process Control and Anticorrosion Study

Based on the sol‐gel principle of tetraethyl orthosilicate (TEOS) and vacuum pressure impregnation (VPI) principle, this study constructs and characterizes two types of 2D/3D heterostructures: reduced graphene oxide‐modified silica‐95S corrosion inhibitor (rGO‐SiO 2 ‐95S) hybrid materials in situ. This was achieved by modifying the experimental steps of the ‘two‐step method’ (methods I and II) and varying the duration (24, 48, and 72 h). The study investigated the impact of various process conditions on the efficiency of the hybrid‐loaded 95S by altering the impregnation pressure (−0.1 to 0.1 MPa) and impregnation time (1 to 5.5' h). The addition of hybrids significantly improves bonding strength and barrier qualities of epoxy coatings, and markedly enhances the corrosion protection efficiency with 90.51% while the impedance modulus at the lowest frequency (|Z| 0.01 Hz) showing enhancements of 1 ≈ 2 order of magnitude compared to EP. It was observed that hybrids prepared using method I after 48 h displayed the optimal mechanical and anti‐corrosion properties.