Improved Interfacial Interactions by Core–Shell CoFe₂O₄@SiO₂ Composites to Enhance the Ability of Corrosion Resistance and Electromagnetic Wave Absorption

Abstract

With the rapid development of science and technology, stealth and anti‐corrosion activities in oceans have attracted widespread attention. This study successfully prepares CoFe2O4@SiO2 with a core–shell structure. This core–shell structure endows the CoFe2O4@SiO2 with good impedance matching and interfacial polarization. Thus, the CoFe2O4@SiO2 exhibits an excellent electromagnetic wave absorption performance with a minimum reflection loss of −45.16 dB. Moreover, the CoFe2O4@SiO2 exhibits an excellent dispersion ability in epoxy. The corrosion resistance of the CoFe2O4@SiO2/epoxy is enhanced. After 60 days of immersion, the low‐frequency impedance modulus of the CoFe2O4@SiO2/epoxy is still >109 Ω cm2. The CoFe2O4@SiO2 realize the dual functions of stealth and anti‐corrosion, which provide ideas for developing marine stealth applications.