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<p>In this study, SiO<sub>2</sub>-coated flaky carbonyl iron powder (FCIP@SiO<sub>2</sub>) composites with varying coating ratios were successfully fabricated using an acoustic resonance-assisted modification method. The effects of the SiO<sub>2</sub> coating on electromagnetic properties, microwave absorption performance, thermal stability, and corrosion resistance were systematically investigated. Electromagnetic characterization revealed that the SiO<sub>2</sub> coating effectively regulated the balance between conduction and polarization, optimized impedance matching, and suppressed excessive conductive losses, thereby improving microwave absorption. Notably, with a thickness of 4.0 mm, the FCIP@SiO<sub>2</sub>-5% sample achieved a remarkable minimum reflection loss of − 24.57 dB at 2.08 GHz (S-band), significantly outperforming the pristine FCIP. Regarding thermal stability, thermogravimetric analysis demonstrated that the dense SiO<sub>2</sub> shell significantly enhanced oxidation resistance. The onset oxidation temperature of the FCIP@SiO<sub>2</sub>-5% sample was delayed to 227.80&#xa0;°C (an increase of ~ 83.5&#xa0;°C compared to uncoated FCIP), and it exhibited the lowest total mass gain at 900&#xa0;°C. Electrochemical tests indicated enhanced corrosion resistance, with the corrosion potential positively shifting from − 0.906 V to − 0.818 V.</p> Graphical Abstract <p></p>

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Enhanced Microwave Absorption and Corrosion Resistance of Flaky Carbonyl Iron by Acoustic Resonance-Assisted SiO2 Coating

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Zilong Zhang,
  • Na Liu,
  • Qianchi Chen,
  • Kaidan Xiao,
  • Lin Huang,
  • Zhongchen Lu

摘要

In this study, SiO2-coated flaky carbonyl iron powder (FCIP@SiO2) composites with varying coating ratios were successfully fabricated using an acoustic resonance-assisted modification method. The effects of the SiO2 coating on electromagnetic properties, microwave absorption performance, thermal stability, and corrosion resistance were systematically investigated. Electromagnetic characterization revealed that the SiO2 coating effectively regulated the balance between conduction and polarization, optimized impedance matching, and suppressed excessive conductive losses, thereby improving microwave absorption. Notably, with a thickness of 4.0 mm, the FCIP@SiO2-5% sample achieved a remarkable minimum reflection loss of − 24.57 dB at 2.08 GHz (S-band), significantly outperforming the pristine FCIP. Regarding thermal stability, thermogravimetric analysis demonstrated that the dense SiO2 shell significantly enhanced oxidation resistance. The onset oxidation temperature of the FCIP@SiO2-5% sample was delayed to 227.80 °C (an increase of ~ 83.5 °C compared to uncoated FCIP), and it exhibited the lowest total mass gain at 900 °C. Electrochemical tests indicated enhanced corrosion resistance, with the corrosion potential positively shifting from − 0.906 V to − 0.818 V.

Graphical Abstract