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Published on: July 3, 2025
Super-Anticorrosive Materials Based on Bifunctionalized Reduced Graphene Oxide.
Edgar H Ramírez-Soria1, Ulises León-Silva2, Leonardo Rejón-García2
1Advanced Functional Materials & Nanotechnology Group, Centro de Investigación en Materiales Avanzados S. C. (CIMAV-Unidad Monterrey), Av. Alianza Norte 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, Apodaca C.P. 66628, Nuevo León, Mexico.
New epoxy resin/bifunctionalized reduced graphene oxide (ER/BFRGO) nanocomposites offer superior corrosion protection for steel. This advanced coating provides active-passive protection, significantly reducing corrosion rates in saline environments.
Area of Science:
- Materials Science and Engineering
- Corrosion Science
- Nanotechnology
Background:
- Multifunctional coatings require materials with multiple functional groups for enhanced properties like corrosion resistance.
- Existing coatings often lack comprehensive protection against various corrosive mechanisms.
- Graphene oxide (GO) derivatives show promise in material science but require specific functionalization for targeted applications.
Purpose of the Study:
- To develop novel solvent-free epoxy resin/bifunctionalized reduced graphene oxide (ER/BFRGO) nanocomposites for advanced anticorrosive coatings.
- To investigate the synergistic effect of amine (-NH2) and ammonium (-NH3+) groups on reduced graphene oxide for enhanced passive-active corrosion protection.
- To evaluate the anticorrosive performance of ER/BFRGO coatings on A36 mild steel in a saline environment.
Main Methods:
- Synthesis of bifunctionalized reduced graphene oxide (BFRGO) with both -NH2 and -NH3+ groups.
- Fabrication of solvent-free epoxy resin nanocomposite coatings (ER/BFRGO) incorporating BFRGO.
- Electrochemical characterization (corrosion current density, polarization resistance) of coated A36 mild steel in 1 M NaCl solution.
Main Results:
- ER/BFRGO nanocomposite coatings demonstrated exceptional anticorrosive properties on A36 mild steel.
- Corrosion current density (i_corr) was reduced by six orders of magnitude (5.12 × 10^-12 A/cm^2) compared to bare steel.
- Polarization resistance (Rp) increased by three orders of magnitude (6.04 × 10^7 Ω/cm^2), indicating superior corrosion inhibition.
Conclusions:
- The developed ER/BFRGO nanocomposites provide a novel and highly effective active-passive protection mechanism against corrosion.
- The bifunctionalization strategy of GO with -NH2 and -NH3+ groups represents a significant advancement in smart material design.
- This research opens new avenues for creating advanced multifunctional nanomaterials for demanding applications.
