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Corrosion resistance of graphene/basalt flake modified waterborne epoxy zinc-rich primer

Xiao Wang (School of Materials Science and Engineering, Ocean University of China, Qingdao, China)
Xuan Liang (School of Ocean, Yantai University, Yantai, China)
Bo Wang (Marine Chemical Research Institute, Qingdao, China)
Chang-qing Guo (Marine Chemical Research Institute, Qingdao, China)
Shan-gui Zhang (Marine Chemical Research Institute, Qingdao, China)
Kai Yang (Marine Chemical Research Institute, Qingdao, China)
Shi-ya Shao (Marine Chemical Research Institute, Qingdao, China)
Yan Sun (Marine Chemical Research Institute, Qingdao, China)
Zheng Guo (Yantai Huazheng Kexin New Material Technology Co. LTD, Yantai, China)
Xue-yan Yu (School of Materials Science and Engineering, Ocean University of China, Qingdao, China)
Donghai Zhang (Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China)
Tai-jiang Gui (Marine Chemical Research Institute, Qingdao, China)
Wei Lu (Marine Chemical Research Institute, Qingdao, China)
Ming-liang Sun (School of Materials Science and Engineering, Ocean University of China, Qingdao, China)
Rui Ding (School of Ocean, Yantai University, Yantai, China)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 3 May 2023

Issue publication date: 29 November 2024

124

Abstract

Purpose

The purpose of this study is to evaluate the effect of graphene, basalt flakes and their synergy on the corrosion resistance of zinc-rich coatings. As the important heavy-duty anticorrosion coatings, zinc-rich coatings provided cathodic protection for the substrate. However, to ensure cathodic protection, a large number of zinc powder made the penetration resistance known as the weakness of zinc-rich coatings. Therefore, graphene and basalt flakes were introduced into zinc-rich coatings to coordinate its cathodic protection and shielding performance.

Design/methodology/approach

Three kinds of coatings were prepared; they were graphene modified zinc-rich coatings, basalt flakes modified zinc-rich coatings and graphene-basalt flakes modified zinc-rich coatings. The anticorrosion behavior of painted steel was studied by using the electrochemical impedance spectroscopy (EIS) technique in chloride solutions. The equivalent circuit methods were used for EIS analysis to obtain the electrode process structure of the coated steel system. Simultaneously, the corrosion resistance of the three coatings was evaluated by water resistance test, salt water resistance test and salt spray test.

Findings

The study found that the addition of a small amount of graphene and basalt flakes significantly improved the anticorrosion performance of coatings by enhancing their shielding ability against corrosive media and increasing the resistance of the electrochemical reaction. The modified coatings exhibited higher water resistance, salt water resistance and salt spray resistance. The graphene-basalt flakes modified zinc-rich coatings demonstrated the best anticorrosion effect. The presence of basalt scales and graphene oxide in the coatings significantly reduced the water content and slowed down the water penetration rate in the coatings, thus prolonging the coating life and improving anticorrosion effects. The modification of zinc-rich coatings with graphene and basalt flakes improved the utilization rate of zinc powder and the shielding property of coatings against corrosive media, thus strengthening the protective effect on steel structures and prolonging the service life of anticorrosion coatings.

Originality/value

The significance of developing graphene-basalt flakes modified zinc-rich coatings lies in their potential to offer superior performance in corrosive environments, leading to prolonged service life of metallic structures, reduced maintenance costs and a safer working environment. Furthermore, such coatings can be used in various industrial applications, including bridges, pipelines and offshore structures, among others.

Keywords

Acknowledgements

The authors gratefully acknowledge the support of Shandong Natural Science Foundation, Grand NO. ZR2020QB071, Open Fund supported by Key Laboratory of Marine Materials and Related Technologies, CAS and Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Grand NO. 2021K08, College Students’ innovation and Entrepreneurship Project, Grand NO. 202211066001, Open Fund supported by State Key Laboratory of Marine Coatings (Marine Chemical Research Institute), Grand NO. 202112DR.

Xiao Wang and Xuan Liang were co-first authors and contributed equally to this work.

Citation

Wang, X., Liang, X., Wang, B., Guo, C.-q., Zhang, S.-g., Yang, K., Shao, S.-y., Sun, Y., Guo, Z., Yu, X.-y., Zhang, D., Gui, T.-j., Lu, W., Sun, M.-l. and Ding, R. (2024), "Corrosion resistance of graphene/basalt flake modified waterborne epoxy zinc-rich primer", Pigment & Resin Technology, Vol. 53 No. 6, pp. 786-796. https://doi.org/10.1108/PRT-08-2022-0101

Publisher

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Emerald Publishing Limited

Copyright © 2023, Emerald Publishing Limited

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