Polymeric coating reinforced with Co2O3 nanoparticles (1 wt%) for improved mechanical, thermal, and corrosion resistance on AISI 1018 carbon steel
Tipo:
Articulos de Divulgación
Autor:
González-Vázquez, J.A.*, Flores-Villaseñor, S.E., Ríos-Hurtado, J.C., García-Rentería, M.A.
Fecha:
2026-03-01
Descripción:
This study analyzed the improvement of the mechanical, thermal, and anticorrosive properties of polyurethane (PU) coatings by incorporating cobalt oxide (Co₂O₃) nanoparticles at 1 wt%. Unlike conventional additives, which act mainly through passivation or sacrificial mechanisms, Co₂O₃ was evaluated as a multifunctional reinforcement. The synthesis was carried out by mixing polyols and antifoaming agents at 25 °C, incorporating the nanoparticles into the polymeric matrix. The samples were characterized by FTIR, XRD, TGA, tensile tests (ASTM D638), and electrochemical measurements in 5% NaCl solution. FTIR confirmed the PU bands and a signal at 570 cm⁻¹ associated with Co₂O₃, while XRD revealed crystallographic planes (311), (111), and (440). TGA showed higher thermal stability in the reinforced system, with 82% mass loss at 456.39 °C compared to 90% at 440.15 °C in pure PU. In tensile tests, the Co₂O₃-reinforced coating reached 16.55 MPa compared to 9.58 MPa for PU. However, electrochemical analysis revealed an increased corrosion rate (0.047 mpy vs. 0.008 mpy), attributed to nanoparticle agglomeration and defect formation. In conclusion, Co₂O₃ enhanced the thermal and mechanical performance but requires optimized dispersion to ensure anticorrosive protection.
Keywords: Corrosion, Coating, Nanoparticles, Polymeric, Potentiodynamic.
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