Effect of corrosion performance of FeSiAl electromagnetic shielding coating on absorbing properties
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摘要: 以在Q235冷軋鋼板表面涂敷的FeSiAl電磁屏蔽涂層為研究對象，通過改變固化條件，探究了電磁屏蔽涂層的最優固化環境.同時，運用中性鹽霧試驗、電磁屏蔽性能測試和電化學阻抗試驗，研究了自然條件固化后涂層的吸波性能和耐蝕性能隨鹽霧周期不同的變化規律.結果表明，電磁場下固化會損害涂層的腐蝕屏蔽性.吸波劑含量的增加不利于提升涂層的吸波性能，同時也會損害涂層的腐蝕屏蔽性.長期鹽霧試驗后，涂層的吸波性能隨腐蝕屏蔽性的降低而下降.Abstract: As science and high-tech have developed, stealth technology has gained increasing prominence in the military field. Application of stealth technology can improve the survival, defense, and attack capabilities of military equipment, thus it has become a focus in the field of modern military science. As the core part of radar stealth technology, absorbing materials are widely required by various industries. For military equipment such as ships operating in the marine environment, absorptive coating can not only make the military equipment effectively invisible, but can also enhance the corrosion protection capability of the equipment itself. Once the surface of an absorptive coating is corroded, not only will its corrosion resistance become compromised, but its absorbing performance may also be affected, leading to threats and hidden dangers to the safety of the weapons and equipment. At present, most researchers are paying more attention to the effect of absorbent particles on absorbing properties during studies of absorptive coatings. However, after addition of absorbent particles, the effect of the absorptive coating on a material's absorbing properties is unknown when corrosion resistance is constantly changing. Therefore, research in this area is of great significance in selection of surface absorbing coatings for marine weapons and equipment. In this study, FeSiAl electromagnetic shielding coating, based on Q235 cold-rolled steel, was used as the experimental material. By changing curing conditions, the optimal curing environment for electromagnetic shielding coating was explored. At the same time, the neutral salt spray test, electromagnetic shielding performance test, and electrochemical impedance test were applied to study the variations in absorption and corrosion resistance of the coating after curing in natural conditions during the salt spray period. Results show that curing under an electromagnetic field can impair the corrosion resistance of the coating. Increasing the content of the absorbing agent was not conducive to improving the absorbing properties of the coating, and impaired the corrosion shielding properties of the coating. After the long-term salt spray test, absorbing properties of the coating decreased with decreasing corrosion shielding properties.
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Key words:
- FeSiAl /
- absorbing coating /
- corrosion resistance /
- electromagnetic shielding /
- absorbing properties
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圖 2 不同環境下固化的50%FeSiAl的吸波涂層微觀形貌. (a)自然環境下固化; (b)0.1 T電磁場下固化
Figure 2. Microscopic images of 50% FeSiAl coatings cured in different environments: (a) curing in the natural environment; (b) curing under 0.1 T electromagnetic field
圖 3 不同環境下固化的含50%FeSiAl涂層的電化學阻抗低頻模值圖. (a)自然環境下固化; (b)0.1 T電磁場下固化
Figure 3. Electrochemical impedance spectroscopies of 50% FeSiAl coatings cured in different curing environments: (a) curing in the natural environment; (b) curing under 0.1 T electromagnetic field
圖 4 不同質量分數的FeSiAl涂層經過不同鹽霧周期后的宏觀形貌. (a)30%, 0周; (b)30%, 4周; (c)30%, 8周; (d)50%, 0周; (e)50%, 4周; (f)50%, 8周
Figure 4. Macroscopic images of the different FeSiAl coating contents: (a)30%, 0week; (b)30%, 4 weeks; (c)30%, 8 weeks; (d)50%, 0 week; (e)50%, 4 weeks; (f)50%, 8 weeks
圖 5 不同質量分數的FeSiAl涂層的電化學阻抗譜. (a)30%;(b)50%
Figure 5. Electrochemical impedance spectroscopies of different mass fractions of the FeSiAl coatings: (a)30%; (b)50%
圖 6 不同質量分數的FeSiAl涂層經過不同鹽霧周期后的反射損耗曲線. (a)0周; (b)4周; (c)8周
Figure 6. Reflection loss of different mass fractions of the FeSiAl coatings in different salt spray cycles: (a)0 week; (b)4 weeks; (c)8 weeks
圖 7 不同條件下固化完全的FeSiAl涂層阻抗模值(0.01 Hz)隨電化學測試浸泡時間延長的變化規律
Figure 7. Relationship between low-frequency impedance moduli and electrochemical test immersion times of the FeSiAl coatings in different curing environments
圖 8 FeSiAl涂層的最小反射損耗與低頻阻抗模值之間的關系
Figure 8. Relationship between minimum reflectivity and low-frequency impedance moduli of the FeSiAl coatings and nickel-based coatings
表 1 實驗所用基本原料
Table 1. Basic materials used in the experiment
原料 作用 廠家 FeSiAl吸波涂料 涂層 大連理工 NaCl 鹽霧及電化學測試 西亞化工 
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久色视频表 2 吸波涂層經過不同鹽霧周期后的吸波參數及低頻阻抗模值
Table 2. Absorbing parameters and low-frequency impedance moduli of absorbing coatings after different salt spray cycles
試樣編號 反射損耗低于-10 dB 最小反射損耗/dB |Z|0.01 Hz/Ω 吸收頻段/GHz 有效帶寬/GHz 30% FSA(0) 13.44~17.93 4.49 -14.03 2.61×1010 30% FSA(4) 16.49~18 1.51 -13.70 9.96×109 30% FSA(8) 12.98~16.68 3.7 -12.18 2.06×109 50% FSA(0) — — -9.1 6.67×108 50% FSA(4) — — -7.24 7.51×107 50% FSA(8) — — -6.84 7.26×106
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