Super-Anticorrosive Materials Based on Bifunctionalized Reduced Graphene Oxide
| Autor: | José Bonilla-Cruz, Leonardo Rejón-García, U. León-Silva, Edgar H. Ramírez-Soria, Tania E. Lara-Ceniceros, Rigoberto C. Advincula |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Nanocomposite Graphene Oxide 02 engineering and technology Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Corrosion Nanomaterials law.invention chemistry.chemical_compound Chemical engineering chemistry law visual_art visual_art.visual_art_medium Molecule General Materials Science 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | ACS applied materialsinterfaces. 12(40) |
| ISSN: | 1944-8252 |
| Popis: | The design of new materials with two or more functional groups must be strongly considered to achieve multifunctional coatings with outstanding properties such as active-passive protection against corrosion, low-friction, antifouling, and sensing, among others. In this sense, nanocomposites based on solvent-free epoxy resin/bifunctionalized reduced graphene oxide layers with NH2 and NH3+ groups (ER/BFRGO) with super-anticorrosive properties are for the first time reported here. The amine groups (-NH2) act as cross-linker agents, which react with epoxy terminal groups from resin, thus closing the gap between the BFRGO layers and the polymeric matrix. Meanwhile, the ammonium ions (-NH3+) are effective trapping agents of negatively charged atoms or molecules (e.g., Cl-). This novel combination enables us to obtain nanocomposite coatings with passive-active protection against corrosion. ER/BFRGO deposited onto A36 mild steel exhibited a remarkably enhanced barrier against corrosion into a saline medium (1 M NaCl; 58.4 g/L), wherein the corrosion current density (icorr) was diminished 6 orders of magnitude (icorr = 5.12 × 10-12 A/cm2), with respect to A36 mild steel coated only with ER (icorr = 2.34 × 10-6 A/cm2). Also, the highest polarization resistance Rp = 6.04 × 107 Ω/cm2 was obtained, which represents the lowest corrosion rate and corresponds to 3 orders of magnitude higher than A36 mild steel coated with ER (Rp = 1.43 × 104 Ω/cm2). The strategy of bifunctionalization proposed herein to obtain bifunctionalized reduced GO with NH2 and NH3+ groups has not been disclosed in the literature before; in consequence, this work opens a new pathway toward the design of smart materials based on multifunctional nanomaterials. |
| Databáze: | OpenAIRE |
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