Electromagnetic wave absorption materials inevitably encounter corrosive conditions during service, making corrosion-resistant design essential for their practical deployment.
Researchers from China's Northwestern Polytechnical University have developed a magnetic graphene composite aerogel (reduced graphene oxide (rGO)/ porous hollow Ni/C microspheres (PHNiC)). The new aerogel reportedly demonstrates excellent impedance matching and electromagnetic attenuation, achieving a minimum reflection loss of −51.3 dB at a thickness of 2.5 mm and a broad effective absorption bandwidth of 6.64 GHz.
In addition, the conformal encapsulation of magnetic nanoparticles with rGO establishes a corrosion-mitigating barrier through interfacial passivation, effectively suppressing electrolyte penetration and anodic dissolution.
Consequently, the rGO/PHNiC aerogel exhibits significantly improved corrosion resistance, with a corrosion potential of –0.45 V vs. saturated calomel electrode and a corrosion current density of 3.3 μA, demonstrating over 90% reduction in corrosion rate compared to uncoated counterparts.
This study provides valuable insights for the design of microwave absorbing materials that function in complex environments.
