In-depth insight into the inhibition mechanism in iron-based composites with bifunction of anti-corrosion and electromagnetic wave absorption based on experiments and theoretical calculations

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作   者：

Xianyu Jiang;  Jianliang Xie;  Liangjun Yin;  Jian Peng;  Jianxiao Li;  Peng Zhang;  Min Zhang;  Huanyu Qin;  Zhi Jing;  Le Yuan;  Linbo Zhang;  Longjiang Deng; 

作者机构：

University of Electronic Science and Technology of China;  Xihua University;  Ltd;  Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education;  School of Materials Science and Engineering;  Shenyang 110034;  Sichuan;  2006 Xiyuan Road;  Chengdu 611731;  Key Laboratory of Materials and Surface Technology (Ministry of Education);  National Engineering Research Center of Electromagnetic Radiation Control Materials;  Chengdu 610039;  China;  Shenyang Aircraft Design and Research Institute;  Aviation Industry Corporation of China; 

关键词：

Corrosion resistance;  Microwave absorption;  Theoretical calculations;  Carbonyl iron (CI);  Organic hydrophobic coating; 

期刊名称：

Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials

i s s n：

0169-4332

年卷期：

2024 年 665 卷 Aug.30 期

页   码：

160362.1-160362.14

页   码：

摘   要：

The design of anti-corrosive magnetic metal microwave-absorbing materials is crucial for enhancing the environmental compatibility and service life of military objectives in practical applications. Herein, CI@BT-SA@OTMS composites were synthesized using an improved sol-gel method with 2-benzothiazolylthio-succinic acid (BTSA) and trimethoxy (octadecyl) silane (OTMS) as precursor materials. The corrosion resistance mechanisms were investigated in both experimental research and theoretical calculations. Electrochemical experimental results affirmed that the CI@BTSA@OTMS composites exhibited exceptional anti-corrosion with the corrosion potential (E_(corr)) shifted positively to 0.05 V, the corrosion current (I_(COrr) exhibited a low level, measuring only 1.1 × 10~(-7) A/ cm~(-2), and the protection efficiency attained 99.91 %. The CI@BTSA@OTMS composites exhibited a higher non-wetting property with a contact angle of 138.9°. After 480 h of exposure in a natural salt spray test, the composites still retained relatively intact morphological and compositional characteristics. These results can be attributed to the effective inhibition of corrosive species' proximity due to the spatial isolation and barrier effects, preventing the formation of an electrochemical corrosion circuit. Moreover, simulations and calculations are employed for revealing the diffusion and inhibition mechanisms of corrosive media. For electromagnetic performance, the introduction of organic layer BTSA@OTMS contributed to improve impedance matching in magnetic metal microwave absorbers.