Preparation and Performance of Self-assembled Carbon/Epoxy Composite Microwave Absorbing Coating

doi:10.11901/1005.3093.2023.103

Chinese Journal of Materials Research

2023, Vol. 37

Issue (12): 952-960 DOI: 10.11901/1005.3093.2023.103

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Preparation and Performance of Self-assembled Carbon/Epoxy Composite Microwave Absorbing Coating

XU Wenyu, SUN Jiawen, ZHU Yaofeng(

)

School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China

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XU Wenyu, SUN Jiawen, ZHU Yaofeng. Preparation and Performance of Self-assembled Carbon/Epoxy Composite Microwave Absorbing Coating. Chinese Journal of Materials Research, 2023, 37(12): 952-960.

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Abstract

Electromagnetic absorbing material is one of the key materials for the realization of equipment stealth protection. Moreover, electromagnetic absorbing materials with high electromagnetic absorption and corrosion resistance will play a key role in special marine environments. Herein, the CS@rGO/EP composite functional coating with excellent microwave absorbing performance and anti-corrosion properties is successfully fabricated through physical mixing method with CS@rGO as wave absorbing filler, and the epoxy resin (EP) as matrix. The structure and properties of the CS@rGO/EP composite functional coating were characterized. The results display that the CS@rGO/EP composite functional coating possess excellent microwave absorbing properties. When the CS@rGO absorber content is 20% and the coating thickness is 1.1mm, the minimum reflection loss value of the coating can reach -25.03 dB. Meanwhile, the coating can maintain well adhesion to the steel substrate after the coating/Q235 carbon steel plate has been immersed in 5%NaCl or NaOH solutions for 30 days, and electrochemical tests manifest that the corrosion rate of the coating/Q235 steel is as low as (6.53×10^-6 mm·a^-1), i.e. a high protection efficiency (92.86%). All in all, the good comprehensive performance of CS@rGO/EP composite functional coating shows its great application potential in special service environments.

Key words: composites absorbing materials electrostatic self-assembly-high temperature carbonization self-assembled carbon/epoxy composite coatings anti-corrosion properties

Received: 29 January 2023

ZTFLH:

TB332

Corresponding Authors: ZHU Yaofeng, Tel: (0571)86843607, E-mail: yfzhu@zstu.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.103 OR https://www.cjmr.org/EN/Y2023/V37/I12/952

Fig.1 Preparation procedures of self-assembled carbon/epoxy resin (CS@rGO/EP) functional coating

Table 1 Standard for valuating grade of surface shedding

Fig.2 FESEM images of CS (a) andCS@rGO (b); TEM images of CS (a1) andCS@rGO (b); FESEM images of surfaces (c-g) and cross sections (c1-g1) of samples with different mass fractions of CS@rGO; XRD pattern (h) and FT-IR spectra(i-j) of samples

Fig.3 The absorption properties of CS@rGO/EP (a) reflection loss, (b)the real part of the dielectric constant, (c) the imaginary part of the dielectric constant, (d) dielectric loss, (e) impedance matching, (f) attenuation constant (g) Schematic diagram of microwave absorption mechanism; (h) Comparison of electromagnetic wave absorption performance of functional coatings

Fig.4 Coating adhesion test effect of samples(a), solvent resistant test effect of samples after soak in 5%NaCl medium for 30 days (b) and Soak in 5%NaOH medium for 30 days (c)

Table 2 Performance for solvent resistant of different coatings

Fig.5 Coating corrosion resistance (a) Nyquist plot, (b) impedance-frequency Bode plot, (c) phase-frequency Bode plot of SF-0; (d) Nyquist plot, (e) impedance-frequency Bode plot, (f) phase-frequency Bode plot of SF-20; Equivalent circuit diagrams of (g) SF-0 and (h)SF-20; (i) The Tafel curve of samples immersed in 3.5%NaCl solution for 21 days

Table 3 Tafel polarization curve fitting value of samples immersed in solution for 21 d

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