Preparation and Protective Properties of Superhydrophobic Modified Basalt/epoxy Coatings

doi:10.11902/1005.4537.2024.006

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1476-1484 DOI: 10.11902/1005.4537.2024.006

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Preparation and Protective Properties of Superhydrophobic Modified Basalt/epoxy Coatings

CAO Jingyi¹, ZHAO Yi¹, LIU Yanshuo², FANG Zhigang¹, JING Yuan², LI Liang¹, MENG Fandi²(

)

1. Unit 92228, People's Liberation Army, Beijing 100072, China
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

CAO Jingyi, ZHAO Yi, LIU Yanshuo, FANG Zhigang, JING Yuan, LI Liang, MENG Fandi. Preparation and Protective Properties of Superhydrophobic Modified Basalt/epoxy Coatings. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1476-1484.

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Abstract

Micro-nano structures were constructed on basalt flakes by alkali etching. Then nanosized ZnO-particulates were coated on the modified basalt flakes in assistance with silane coupling agent and stearic acid modifying agent. A super-hydrophobic, anti-corrosion and antibacterial composite coating consisted of basalt@ZnO and epoxy was prepared on Q235 carbon steel. The results show that the superhydrophobic basalt@ZnO/epoxy coating has a large water contact angle (approximately 152°). The modification of stearic acid could delay the occurrence of photocatalytic reaction and the release of reactive oxygen species, thus delaying the expression of antibacterial properties of ZnO. The anti-bacterial adhesion function of the composite coating is realized from two aspects: the hydrophobic mechanism of the superhydrophobic surface and avoiding the mass death of bacteria near the coating in a short time. After immersion in 3.5% NaCl solution for 14 d, the corrosion resistance of the superhydrophobic coating is 2 orders of magnitude higher than that of the plain epoxy coating, indicating that superhydrophobic basalt@ZnO/epoxy coating has superior barrier properties against corrosive media.

Key words: superhydrophobic ZnO basalt anticorrosion antibacterial

Received: 03 January 2024 32134.14.1005.4537.2024.006

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52271052);National Natural Science Foundation of China(U20A20233)

Corresponding Authors: MENG Fandi, E-mail: fandimeng@mail.neu.edu.cn

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	CAO Jingyi
	ZHAO Yi
	LIU Yanshuo
	FANG Zhigang
	JING Yuan
	LI Liang
	MENG Fandi

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.006 OR https://www.jcscp.org/EN/Y2024/V44/I6/1476

Fig.1 SEM images of EB (a), TEB (b) and TZEB (c) added EP coatings, showing the morphologies of different scales and their distributions on the coating surfaces

Fig.2 FTIR spectra of four kinds of basalt

Fig.3 XPS general spectrum of TZEB scales (a), and fine spectra of C 1s (b), Si 2p (c), O 1s (d), S 2p (e) and Zn 2p (f)

Fig.4 Water contact angles of four kinds of basalt scales

Fig.5 Plate counting results of EP (a1, b1), TEB/EP (a2, b2) and TZEB/EP (a3, b3) coatings co-cultured with PAO1 for 7 d (a1-a3) and 14 d (b1-b3)

Fig.6 Live (a, c, e) and dead (b, d, f) bacterial staining images of EP (a, b), TEB/EP (c, d) and TZEB/EP (e, f) coatings immersed in PAO1 solution for 3 d (a1-f1), 7 d (a2-f2) and 14 d (a3-f3)

Fig.7 SEM surface images of EP (a), TEB/EP (b) and TZEB/EP (c) coatings immersed in PAO1 medium for 14 d

Fig.8 EIS diagrams of EP (a), TEB/EP (b) and TZEB/EP (c) coatings immersed in 3.5%NaCl for 21 d

Fig.9 Equivalent circuit diagram of EIS of three test coatings

Fig.10 Variations of electrical resistances (R_c) of EP, TEB/EP and TZEB/EP coatings

Fig.11 SEM surface images of Q235 carbon steel substrate after 14 d immersion and then removing EB/EP (a), TEB/EP (b) and TZEB/EP (c) composite coatings

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