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Environmentally-friendly magnetic metallic absorbers with high-performing antioxidant property, thermal stability, and anti-corrosion capability have attracted great attention in real-world applications. A surface modification technology of magnetic metallic absorbers with dense and inert materials has been an effective strategy to solve the aforesaid problem. Herein, fluorine-free core–shell carbonyl iron-organic silicon absorbers (CI@SiO2/1,1,1,3,3,3-hexamethyl disilazane (HMDS)) were fabricated via a facile one-pot synthesis using tetraethyl orthosilicate (TEOS) and HMDS as the precursor of protective layer (SiO2/HMDS), and CI@SiO2/HMDS hybrid reveals its long-term corrosion resistance and excellent microwave absorption performance with a minimum reflection loss value of −44.3 dB and an effective absorption bandwidth of 5.3 GHz at a thin thickness of 2.0 mm after immersion in 5.0 wt.% NaCl acidic solutions for 2,160 h. Meanwhile, CI@SiO2/HMDS hybrid can still achieve the maximum radar cross-sectional (RCS) reduction values about 16.5 dB·m2 at the detection θ of 0°. The exceptional microwave absorption performance and structural stability are largely due to the extraordinary wave-transparent property and shielding ability against corrosive medium of SiO2/HMDS hydrophobic protective layer with a contact angle of 132.5°. The research paves the way for the large-scale and batch production of high-performance magnetic metallic absorbers and increases their survivability and reliability in the harsh environments.
The present work was financially supported by the National Natural Science Foundation of China (Nos. 51972045 and 5197021414), the Fundamental Research Funds for the Chinese Central Universities, China (No. ZYGX2019J025), Sichuan Science and Technology Program (Nos. 2020JDRC0015 and 2020JDRC0045), the Natural Science Foundation of Sichuan (No. 2022NSFSC0347), and Sichuan Science and Technology Innovation Talent Project (No. 2021JDRC0021).