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Nano Research 2022, 15(5): 4756-4764 https://doi.org/10.1007/s12274-022-4161-5
Research Article | Issue | Published: 25 February 2022

Smart ZnS@C filler for super-anticorrosive self-healing zinc-rich epoxy coating

Show Author's Information Kai Yang1,2,  Yixue Duan3,  Guicheng Liu2( ),  Guoyan Ma4,  Hao Fu2,  Xuyong Chen1,  Manxiang Wang2,  Gangqiang Zhu5,  Woochul Yang2( ),  Yiding Shen1( )
Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an 710021, China
Department of Physics, Dongguk University, Seoul 04620, Republic of Korea
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China
School of physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China
Keywords:
self-healing, smart ZnS@C filler, microemulsion-carbonization method, zinc-rich epoxy coating, anticorrosion
Topics:
Zinc sulfide
Cite this article:
Yang K, Duan Y, Liu G, et al. Smart ZnS@C filler for super-anticorrosive self-healing zinc-rich epoxy coating. Nano Research, 2022, 15(5): 4756-4764. https://doi.org/10.1007/s12274-022-4161-5
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Abstract Full text Electronic supplementary material About this article

The zinc-rich epoxy cathodic protection coating is the most widely used anticorrosion material for marine steel. However, traditional conductive fillers lack the intelligent self-healing effect, which limits the long-term anticorrosion performance. Herein, with uniform carbon-coated ZnS (ZnS@C) nanoballs as the smart active release filler, we propose an anticorrosive and self-healing zinc-rich maleic anhydride epoxy coating. Due to the high pore filling efficiency of the nanoballs, the water vapor transmission rate of the coating with an initial corrosion efficiency of 99.92% and a low-frequency impedance of |Z|f=10mHz = 3.88 × 1010 Ω·cm2, was reduced by 52%. The carbon-shell of the nanoball increases electron transmission paths in the coating and improves conductivity by nearly two orders of magnitude, which effectively activates more Zn-sites and extends the cathodic protection time. Moreover, once the steel-substrate undergoes regional corrosion, the SO42− hydrolyzes from the ZnS-core of the nanoball and reacts with iron ions on the corroded area accurately and intelligently to fill the gap and self-heals into a new dense barrier layer (Fe2(SO4)3, etc.), which significantly improves the shielding protection ability during the long-term usage of the coating. The effective anticorrosion time of the proposed coating could be up to 3,400 h.


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Electronic supplementary material
About this article

Smart ZnS@C filler for super-anticorrosive self-healing zinc-rich epoxy coating

Show Author's information Kai Yang1,2, Yixue Duan3, Guicheng Liu2( ), Guoyan Ma4, Hao Fu2, Xuyong Chen1, Manxiang Wang2, Gangqiang Zhu5, Woochul Yang2( ), Yiding Shen1( )
Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi’an 710021, China
Department of Physics, Dongguk University, Seoul 04620, Republic of Korea
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China
School of physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China

Abstract

The zinc-rich epoxy cathodic protection coating is the most widely used anticorrosion material for marine steel. However, traditional conductive fillers lack the intelligent self-healing effect, which limits the long-term anticorrosion performance. Herein, with uniform carbon-coated ZnS (ZnS@C) nanoballs as the smart active release filler, we propose an anticorrosive and self-healing zinc-rich maleic anhydride epoxy coating. Due to the high pore filling efficiency of the nanoballs, the water vapor transmission rate of the coating with an initial corrosion efficiency of 99.92% and a low-frequency impedance of |Z|f=10mHz = 3.88 × 1010 Ω·cm2, was reduced by 52%. The carbon-shell of the nanoball increases electron transmission paths in the coating and improves conductivity by nearly two orders of magnitude, which effectively activates more Zn-sites and extends the cathodic protection time. Moreover, once the steel-substrate undergoes regional corrosion, the SO42− hydrolyzes from the ZnS-core of the nanoball and reacts with iron ions on the corroded area accurately and intelligently to fill the gap and self-heals into a new dense barrier layer (Fe2(SO4)3, etc.), which significantly improves the shielding protection ability during the long-term usage of the coating. The effective anticorrosion time of the proposed coating could be up to 3,400 h.

Keywords: self-healing, smart ZnS@C filler, microemulsion-carbonization method, zinc-rich epoxy coating, anticorrosion

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Publication history
Copyright
Acknowledgements

Publication history

Received: 19 August 2021
Revised: 24 September 2021
Accepted: 12 October 2021
Published: 25 February 2022
Issue date: May 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (Nos. 2022R1A2C1007070, 2019R1C1C1006310, 2021K2A9A2A06044652, 2020R1I1A1A01072996, and 2019R1A2C1002844).

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