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Volume 12
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10.3390/coatings12111631
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Article

A Comparative Study of Chloride Adsorption Ability and Corrosion Protection Effect in Epoxy Coatings of Various Layered Double Hydroxides

by
Yanhui Cao
1,2,*,
Jingjing Wang
1,2,
Kaifeng Chen
1,2,
Xinyue Zhang
1,2,
Bing Zhang
3,
Shuo Fang
1,4,
Yu Liang
1,2,
Congshu Huang
1,2 and
Xinyu Wang
3
1
Luoyang Ship Material Research Institute, Xiamen 361101, China
2
Science and Technology on Marine Corrosion and Protection Laboratory, Xiamen 361101, China
3
China Ship Development and Design Center, Wuhan 430064, China
4
Liaoning Provincial Key Laboratory for Preparation and Application of Special Functional Materials, Shenyang University of Chemical Technology, Shenyang 110142, China
*
Author to whom correspondence should be addressed.
Coatings 2022, 12(11), 1631; https://doi.org/10.3390/coatings12111631
Submission received: 12 September 2022 / Revised: 17 October 2022 / Accepted: 20 October 2022 / Published: 27 October 2022
(This article belongs to the Special Issue Novel Coatings for Preventing Marine Biofouling and Corrosion)
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Abstract

The positive influence of chloride adsorption on the enhanced protection effect was always emphasized in the published literature. The concrete contribution of chloride adsorption and physical barrier effect of LDH in coatings still remains unclear at present. This work was aimed at exploring the significance of the chloride adsorption role of LDH in the corrosion protection of epoxy coatings. The synthesized LDH samples were characterized by scanning electronic microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) to show the influence of different parameters on its morphology, structure and composition, respectively. The corrosion-electrochemical behavior was investigated using electrochemical impedance spectroscopy (EIS) and salt spray test. It was found that although CaAl-LDH presented a lower chloride adsorption ability in comparison with other samples; it showed effective corrosion protection due to the higher physical barrier effect of CaAl-LDH with typically hexagonal and plate-like morphology due to good compatibility with the epoxy coatings. The results indicated that the corrosion protection effect of the incorporated LDH was more closely related to its physical barrier role rather than the role of the chloride adsorption, which was misunderstood in the previous publications. This work clarified the contribution comparison of the chloride adsorption and physical barrier of LDH in epoxy coating corrosion protection for the first time.
Keywords: layered double hydroxide (LDH); synthesizing parameters; chloride adsorption; barrier effect; corrosion protection layered double hydroxide (LDH); synthesizing parameters; chloride adsorption; barrier effect; corrosion protection
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MDPI and ACS Style

Cao, Y.; Wang, J.; Chen, K.; Zhang, X.; Zhang, B.; Fang, S.; Liang, Y.; Huang, C.; Wang, X. A Comparative Study of Chloride Adsorption Ability and Corrosion Protection Effect in Epoxy Coatings of Various Layered Double Hydroxides. Coatings 2022, 12, 1631. https://doi.org/10.3390/coatings12111631

AMA Style

Cao Y, Wang J, Chen K, Zhang X, Zhang B, Fang S, Liang Y, Huang C, Wang X. A Comparative Study of Chloride Adsorption Ability and Corrosion Protection Effect in Epoxy Coatings of Various Layered Double Hydroxides. Coatings. 2022; 12(11):1631. https://doi.org/10.3390/coatings12111631

Chicago/Turabian Style

Cao, Yanhui, Jingjing Wang, Kaifeng Chen, Xinyue Zhang, Bing Zhang, Shuo Fang, Yu Liang, Congshu Huang, and Xinyu Wang. 2022. "A Comparative Study of Chloride Adsorption Ability and Corrosion Protection Effect in Epoxy Coatings of Various Layered Double Hydroxides" Coatings 12, no. 11: 1631. https://doi.org/10.3390/coatings12111631

APA Style

Cao, Y., Wang, J., Chen, K., Zhang, X., Zhang, B., Fang, S., Liang, Y., Huang, C., & Wang, X. (2022). A Comparative Study of Chloride Adsorption Ability and Corrosion Protection Effect in Epoxy Coatings of Various Layered Double Hydroxides. Coatings, 12(11), 1631. https://doi.org/10.3390/coatings12111631

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