Robust silica and carbon bilayers decorating spherical FeCo alloys for high-performance anti-corrosion microwave absorption

• Published in: Journal of alloys and compounds Vol. 936; p. 168301
• Main Authors: Chen, Gaobang, Sun, Qihui, Cao, Feng, Khan, Muhammad Saddique Akbar, Zhang, Hongyan, Xu, Hui, Liu, Ziyi, Li, Jinyao, Liu, Yifan, Guo, Yang, Jian, Xian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.03.2023
• Subjects: Anti-corrosion; Carbon layer; FeCo alloy; Microwave absorption; Silica; Anti-corrosion; Carbon layer; Microwave absorption; FeCo alloy; Silica
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.168301

The requirements of microwave absorbers are increasing year by year. However, a great challenge is the coupling of high microwave absorption and corrosion-resistant. To solve these problems, herein, a robust FeCo@SiO2 @C gradient composite was designed through the Stöber method and chemical vapor deposition (CVD) technique to achieve efficient microwave absorption and anti-corrosion. These silica/carbon bilayers possess a rich interface structure, reduce the dielectric constant, and optimize impedance matching, which favors to address efficient microwave absorbing performance with a minimum reflection loss of − 43.93 dB at 7.89 GHz in case of the 4 mm matching thickness. After decorating the silica/carbon bilayers on the FeCo surface, the excellent corrosion shielding protection for the inner FeCo alloy was well addressed. And the polarization resistance increased from 1.21 × 105 Ω·cm2 to 4.65 × 105 Ω·cm2. The corrosion current decreased from 8.623 × 10−6 A/cm2 to 1.357 × 10−6 A/cm2. This high curie temperature magnetic/silica/carbon novel hybrid reduces electromagnetic pollution and opens up a new opportunity to construct an advanced microwave absorber with anti-corrosion function. •A robust FeCo@SiO2@C gradient composite was designed through the Stöber method and CVD techniques.•These silica/carbon bilayers possess a rich interface structure and optimize impedance matching.•The silica/carbon bilayers improves the anti-corrosion performance of absorber.