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Research Article | Open Access

A novel active-passive protection strategy endows carbonyl iron with excellent intelligent anti-corrosion and microwave absorption dual functional characteristics

Wei Tian1, Quanyuan Feng1, Linbo Zhang2( ), Yinfan Liu3, Xian Jian3,4 ( ), Longjiang Deng2
Institute of Microelectronics, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China
National Engineering Researching Centre of Electromagnetic Radiation Control Materials, Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
The Yangtze Delta Region Institute (Huzhou) & School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Huzhou 313001, China
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Graphical Abstract

CI@PDA/BTA@SiO2/HMDS (CI = carbonyl iron absorbers, PDA = polydopamine, BTA = benzotriazole, HMDS = 1,1,1,3,3,3-hexamethyl disilazane) composites exhibit excellent intelligent anti-corrosion and microwave absorption properties, mainly benefiting from the proactive/passive protection and magnetic-dielectric synergistic features of multistage anti-corrosion layers.

Abstract

Carbonyl iron absorbers (CI) face significant challenges in practical applications, such as corrosion, interface bonding failure, detachment, and high maintenance costs. Herein, we have developed intelligent self-healing technology based on proactive/passive mechanisms via in situ synthesis of self-healing factors (polydopamine/benzotriazole (PDA/BTA)) and physical barrier layers (SiO2/1,1,1,3,3,3-hexamethyl disilazane, SiO2/HMDS) to enhance corrosion resistance, while also being compatible with efficient microwave absorption characteristics. The unique multiscale structure gives full play to the utilization of the roles of each functional layer, including the intelligent self-healing features of PDA/BTA, physical shielding and spatial confinement characteristics of SiO2/HMDS, and magnetic-dielectric synergistic mechanism resulted from the good impedance matching characteristics, the conduction loss, the interfacial polarization loss and natural resonance. The as-fabricated composites achieved an exceptional minimum reflection loss value of −55.4 dB at 10.7 GHz and the effective absorption band of 7.6 GHz. Moreover, it still exhibits obvious self-healing and corrosion resistance characteristics after 360 h corrosion treatment, ascribed to the self-healing mechanism of PDA/BTA and the blocking intervention effect of SiO2/HMDS. This work is considered to pave the way for the synthesis of high-performance magnetic absorbers, especially in enhancing their intelligent self-healing ability in corrosive environments.

Keywords

microwave absorptionintelligent self-healing technologycarbonyl ironmultiscale structuremagnetic-dielectric synergistic mechanism

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Nano Research
Volume 18 Issue 1,
January 2025
Article number: 94907029
DOI: 10.26599/NR.2025.94907029
Cite this article:
Tian W, Feng Q, Zhang L, et al. A novel active-passive protection strategy endows carbonyl iron with excellent intelligent anti-corrosion and microwave absorption dual functional characteristics. Nano Research, 2025, 18(1): 94907029. https://doi.org/10.26599/NR.2025.94907029

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Received: 04 August 2024
Revised: 05 September 2024
Accepted: 10 September 2024
Published: 25 December 2024
© The Author(s) 2025. Published by Tsinghua University Press.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/).
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