Preparation and Performance of CeO2@MWCNTs/EP Composite Coatings

doi:10.11902/1005.4537.2022.307

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 992-1002 DOI: 10.11902/1005.4537.2022.307

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Preparation and Performance of CeO₂@MWCNTs/EP Composite Coatings

XUAN Xingyu, QU Shaopeng(

), ZHAO Xingya

College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China

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Abstract

Epoxy composite coatings with different contents of cerium salt treated multi-walled carbon nanotubes (CeO₂@MWCNTs) were prepared on X80 steel. The corrosion behavior and tribological property of the composite coatings were studied. Meanwhile, the morphology, chemical composition and structure, as well as wettability and hardness of CeO₂@MWCNTs/EP composite coating were characterized by means of SEM, TEM and white light interferometer, EDS, XPS and FT-IR, contact angle meter and microhardness tester etc. The results show that there exist physical adsorption for the interface between nano-CeO₂ and MWCNTs in the prepared powder of CeO₂@MWCNTs, while the structure of epoxy can be changed due to the introduction of nano-CeO₂ particulates. CeO₂@MWCNTs is beneficial to reduce the micropores in the CeO₂@MWCNTs/EP composite coating, but the powders may agglomerate when the dosage reaches to 1.0%. It should be noted that CeO₂@MWCNTs in dispersive state can improve the corrosion resistance of the composite coating, but in agglomerated state which presents negative effect. The corrosion resistance of CeO₂@MWCNTs/EP composite coating first increases and then decrease with the increase of CeO₂@MWCNTs content, and among others, the corrosion current density of the coating with 0.5% CeO₂@MWCNTs/EP is the smallest, which is an order of magnitude less than that of the simple EP coating. CeO₂@MWCNTs possesses lubricating function, therefore, the friction coefficient and wear rate of the composite coating show a decreasing trend with the increasing CeO₂@MWCNTs content. The wear rate of 1.0% CeO₂@MWCNTs/EP composite coating decreases by 64.7% in comparison with the simple EP coating.

Key words: coating epoxy CeO₂@MWCNTs corrosion friction and wear

Received: 08 October 2022 32134.14.1005.4537.2022.307

ZTFLH:

TB332

Fund: National Natural Science Foundation of China(51701115);Foundation of Key Laboratory of Marine Materials and Applied Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences(2016K04)

Corresponding Authors: QU Shaopeng, E-mail: spqu@shmtu.edu.cn

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XUAN Xingyu, QU Shaopeng, ZHAO Xingya. Preparation and Performance of CeO₂@MWCNTs/EP Composite Coatings. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 992-1002.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.307 OR https://www.jcscp.org/EN/Y2023/V43/I5/992

Fig.1 Morphologies (a, b) and EDS results (c, d) of MWCNTs (a, c) and CeO₂@MWCNTs (b, d)

Fig.2 TEM (a, d), HRTEM images (b, e) and SAED results (c, f) of MWCNTs (a-c) and CeO₂@MWCNTs (d-f)

Fig.3 XPS spectra of CeO₂@MWCNTs: (a) Ce 3d, (b) O 1s, (c) C 1s

Fig.4 Cross section (a, d, g, j), surface (b, e, h, k) and fracture surface (c, f, i, l) morphologies of EP (a-c) coating and CeO₂@MWCNTs/EP composite coatings with CeO₂@MWCNTs content of 0.1% (d-f), 0.5% (g-i) and 1.0% (j-l)

Fig.5 EDS mapping of Ce in the fracture surface of CeO₂@MWCNTs/EP composite coatings with CeO₂@MWCNTs content of 0.1% (a), 0.5% (b) and 1% (c)

Fig.6 FT-IR spectra of MWCNTs and CeO₂@MWCNTs (a), and CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs (b)

Fig.7 Contact angle test results of CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs

Fig.8 Nyquist (a) and Bode (b) plots of CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs and equivalent circuit (c)

Table 1 Fitting results of EIS of CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs

Fig.9 Porosity variation curve (a) and dynamic poten-tial polarization curves (b) for CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs

Table 2 Fitting electrochemical parameters of CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs

Fig.10 Vickers hardness values of CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs

Fig.11 Friction coefficients (a) and wear rates (b) of CeO₂@MWCNTs/EP composite coatings with different contents of CeO₂@MWCNTs, and 3D profiles of 0% (c), 0.1% (d), 0.5% (e) and 1.0% (f) CeO₂@MWCNTs/EP composite coatings

Fig.12 Schematic diagrams of corrosion resistance of CeO₂@MWCNTs/EP composite coatings containing 0% (a), 0.1% (b), 0.5% (c) and 1.0% (d) CeO₂@MWCNTs

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