Graphene oxide bifunctionalized with NH₂/NH₃⁺ (BFGO) is presented here. Further, its potential application to produce smart nanocomposite coatings (Epoxy Resin-BFGO) with hydrophobic and dual corrosion protection (active-passive) is demonstrated. The underlying bifunctionalization mechanisms were disclosed for the first time, in which graphene oxide was covalently functionalized using N-isopropylidene-3-aminopropyl-triethoxysilane (ITES) by microwave irradiation. The bifunctionalization is produced when the imine is protonated (amine deprotection) under acidic conditions, leading to BFGO with NH₂:NH₃⁺ groups (atomic ratio = 43:57) confirmed by XPS. Nanocomposites based on Epoxy Resin/BFGO exhibited hydrophobic contact angles (θ = 105°) and outstanding passive-active protection against corrosion for A36 mild steel (A36MS) in a saline solution (1 M ≅ 58.4 g/L). These smart nanocomposite coatings exhibited a corrosion current density (i_corr) diminished in around 5 orders of magnitude (i_corr = 3.89 E⁻⁰⁸ mA/cm²) compared to A36MS coated with neat Epoxy Resin (i_corr = 2.34 E⁻⁰³ mA/cm²). Furthermore, Epoxy Resin-BFGO showed a more noble corrosion potential value (E_corr = −158 mV) and the lowest corrosion rate (C_R = 4.57 E⁻⁰⁷ mm/year).

本文介绍了用NH ₂ / NH ₃ ⁺（BFGO）双功能化的氧化石墨烯。此外，还证明了其在生产具有疏水和双重腐蚀保护（主动-被动）的智能纳米复合涂料（环氧树脂-BFGO）方面的潜在应用。首次公开了潜在的双官能化机理，其中使用N-异亚丙基-3-氨基丙基-三乙氧基硅烷（ITES）通过微波辐射将氧化石墨烯共价官能化。亚胺在酸性条件下被质子化（胺脱保护）时会产生双官能化，从而导致NH ₂：NH ₃ ^+的BFGO由XPS确认的基团（原子比= 43:57）。基于环氧树脂/ BFGO的纳米复合材料在盐水溶液（1 M≅58.4 g / L）中表现出疏水接触角（θ= 105°）和出色的被动-主动保护性，以防止A36低碳钢（A36MS）腐蚀。与涂有纯环氧树脂的A36MS（i _corr  = 2.34 E ^-03 mA ）相比，这些智能纳米复合涂层的腐蚀电流密度（i _corr）降低了约5个数量级（i _corr  = 3.89 E ⁻⁰⁸  mA / cm ²）。/ cm ²）。此外，环氧树脂-BFGO表现出更高的腐蚀电位值（E _corr = -158毫伏）和最低腐蚀速率（C ^ _{- [R}  = 4.57ë ^-07 毫米/年）。