Anticorrosive composite self-healing coating enabled by solar irradiation

doi:10.1007/s11705-022-2147-1

Front. Chem. Sci. Eng.

2022, Vol. 16

Issue (9) : 1355-1366 https://doi.org/10.1007/s11705-022-2147-1

RESEARCH ARTICLE

Anticorrosive composite self-healing coating enabled by solar irradiation

Zhentao Hao^1,^2,³, Si Chen^1,^2,³, Zhifeng Lin^1,²(

), Weihua Li^1,²(

)

¹. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
². Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Zhuhai 519082, China
³. School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China

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Abstract

Self-healing coatings for long-term corrosion protection have received much interest in recent years. However, most self-healing coatings rely on healants released from microcapsules, dynamic bonds, shape memory, or thermoplastic materials, which generally suffer from limited healing times or harsh conditions for self-healing, such as high temperature and UV radiation. Herein, we present a composite coating with a self-healing function under easily accessible sunlight by adding Fe₃O₄ nanoparticles and tetradecanol into epoxy resin. Tetradecanol, with its moderate melting point, and Fe₃O₄ nanoparticles serve as a phase-change component and photothermal material in an epoxy coating system, respectively. Fe₃O₄ nanoparticles endow this composite self-healing coating with good photothermal properties and a rapid thermal response time under simulated solar irradiation as well as outdoor real sunlight. Tetradecanol can flow to and fill defects by phase transition at low temperatures. Therefore, artificial defects created in this type of self-healing coating can be healed by the liquified tetradecanol induced by the photothermal effect of Fe₃O₄ nanoparticles under simulated solar irradiation. The healed coating can still serve as a good barrier for the protection of the underlying carbon steel. These excellent properties make this self-healing coating an excellent candidate for various engineering applications.

Keywords self-healing coating phase transition photothermal effect corrosion protection

Corresponding Author(s): Zhifeng Lin,Weihua Li

About author:

Tongcan Cui and Yizhe Hou contributed equally to this work.

Just Accepted Date: 18 February 2022 Online First Date: 29 April 2022 Issue Date: 20 September 2022

Cite this article:

Zhentao Hao,Si Chen,Zhifeng Lin, et al. Anticorrosive composite self-healing coating enabled by solar irradiation[J]. Front. Chem. Sci. Eng., 2022, 16(9): 1355-1366.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2147-1
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I9/1355

Fig.1 (a) Schematic illustration of the facile fabrication process of the composite SHC; (b) ATR-FTIR spectra of the tetradecanol, Fe₃O₄ and the SHC.

Fig.2 SEM of the SHC coating with magnifications of (a) 500 × and (b) 5000 ×; cross-sections of the SHC with magnifications of (c) 1000 × and (d) 3000 ×; white arrows refer to the position of tetradecanol.

Fig.3 Optical images of the surface morphology and wettability evolution of SHCs with different mass fractions of tetradecanol: (a) 4.8 wt%, (b) 14.5 wt%, (c) 19.1 wt%, and (d) 25.3 wt%; bars in all images represent 150 μm.

Fig.4 (a) Infrared thermal images and surface temperature evolution of the SHC with time under simulated solar irradiation; (b) surface temperature evolution of coatings under simulated solar irradiation with time; (c) UV-vis spectra of Fe₃O₄ nanoparticles and the SHC; (d) DSC curves of tetradecanol and the SHC in the 20–80 °C temperature range; (e) cyclic photothermal responsive performance of the SHC.

Fig.5 Images of SHCs with different types of damage: (a) perforation and (b) scratch before and after healing; (c) schematic illustration of the self-healing mechanism of the SHC.

Fig.6 (a) The self-healing process of the SHC under outdoor irradiation with sunlight; surface potential distribution of (b) the damaged SHC and (c) healed SHC recorded by SKP.

Tab.1 Electrochemical parameters of bare CS, epoxy resin-coated CS, and the intact SHC-coated CS

Fig.7 Nyquist and Bode plots of the (a) bare CS and (b) SHC-coated CS; equivalent circuits of the (c) bare CS and (d) SHC-coated CS.

Tab.2 Electrochemical parameters of the intact, damaged and healed SHCs

Fig.8 EIS plots of the damaged SHC before (a) and after (b) the self-healing process; (c) equivalent circuit of both the damaged and healed SHC.

Fig.9 Corrosion protection mechanism of the intact, damaged and healed SHCs.

Tab.3 Electro parameters of the fitting results of the SHC-coated CS with time

Fig.10 (a) Bode-modulus and (b) Bode-phase plots of the SHC with time; (c) equivalent circuit of the SHC; (d) R_ct evolution of the SHC coating with time.

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