Influence of Chemical Bonding Interface of Modified Basalt/epoxy Coating on Its Corrosion Resistance

doi:10.11902/1005.4537.2021.312

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 1009-1015 DOI: 10.11902/1005.4537.2021.312

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Influence of Chemical Bonding Interface of Modified Basalt/epoxy Coating on Its Corrosion Resistance

CAO Jingyi¹, ZANG Bolin¹, CAO Baoxue¹, LI Liang¹, FANG Zhigang¹, ZHENG Hongpeng², LIU Li²(

), WANG Fuhui²

1. Unit 92228, People's Liberation Army, Beijing 100072, China
2. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

Cite this article:

CAO Jingyi, ZANG Bolin, CAO Baoxue, LI Liang, FANG Zhigang, ZHENG Hongpeng, LIU Li, WANG Fuhui. Influence of Chemical Bonding Interface of Modified Basalt/epoxy Coating on Its Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 1009-1015.

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Abstract

Due to the surface smoothness and chemical inertia of basalt flakes, the interfacial bond strength of basalt flake/epoxy resin is poor. In this paper, the basalt flakes were chemically modified by silane coupling agent (KH550) to prepare the modified basalt (MB) flakes. The bare and modified basalt flakes were characterized by FT-IR and SEM/EDS. The dispersibility and compatibility of MB flakes in epoxy resin were examined by sedimentation test and cross-sectional microstructure observation of the prepared flakes/epoxy coating. The adhesion and anti-corrosion properties of MB flakes/epoxy coating were investigated using adhesion test and EIS technology, respectively. The results show that the chemical modification makes the surface of basalt flakes being chemically bonded with KH550, and which is beneficial to the formation the chemical bond interface of MB flakes/epoxy coating, leading to improve the compatibility of MB flakes with epoxy resin, therewith increase the barrier performance and adhesion of the coating, as a result, enhance the anti-corrosion performance of the modified epoxy coating.

Key words: silane coupling agent modified basalt epoxy resin chemical bonded

Received: 03 November 2021

ZTFLH:

TG174.46

Fund: National Key R&D Program of China(2019YFC0312100)

About author: LIU Li, E-mail: liuli@mail.neu.edu.cn

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	Articles by authors
	Jingyi CAO
	Bolin ZANG
	Baoxue CAO
	Liang LI
	Zhigang FANG
	Hongpeng ZHENG
	Li LIU
	Fuhui WANG

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.312 OR https://www.jcscp.org/EN/Y2022/V42/I6/1009

Fig.1 FT-IR spectra of KH550, Basalt and MB scales

Fig.2 SEM images of MB scales at low (a) medium (b) and high (c) magnifications, and EDS surface scannings of Si (d), O (e) and N (f)

Fig.3 Adhesion strengths of B/EP and MB/EP coatings after immersion for different time

Fig.4 Equivalent electrical circuits of the coating/steel system after immersion for different time: (a) one time constant, (b) two time constants

Fig.5 Bode (a, c) and Nyquist (b, d) plots of B/EP (a, b) and MB/EP (c, d) coatings after immersion for different time

Fig.6 Variations of C_c (a), R_c (b) and R_t (c) of B/EP and MB/EP coatings with immersion time

Fig.7 Digital images of Basalt (a) and MB (b) scales dispersed in epoxy resin after static settlement for different time

Fig.8 SEM images of the surfaces (a1, b1) and cross sections (a2, b2) of B/EP coating (a1, a2) and MB/EP coating (b1, b2)

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