Degradation Behavior of an Epoxy Corrosion-resistant Coating in NaCl Solution

doi:10.11902/1005.4537.2023.375

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (5): 1361-1369 DOI: 10.11902/1005.4537.2023.375

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Degradation Behavior of an Epoxy Corrosion-resistant Coating in NaCl Solution

WANG Tiancong¹, ZHAO Dongyang²(

), XIANG Xueyun¹, WU Hang¹, WANG Wen²

1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

WANG Tiancong, ZHAO Dongyang, XIANG Xueyun, WU Hang, WANG Wen. Degradation Behavior of an Epoxy Corrosion-resistant Coating in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1361-1369.

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Abstract

A study was conducted on the degradation behavior of an epoxy corrosion-resistant coating in NaCl solution, focusing on the electrochemical impedance, water absorption, and adhesion of the coating. The results indicated that the coating still exhibits good protective performance after immersion for 5350 h. Meanwhile, a correlation between the changes in electrochemical impedance, water absorption, and adhesion of the coating was observed. The physical/chemical reaction between the electrolyte solution and the resin material might be the main mechanism of the coating degradation, with temperature being a significant influencing factor and the effect of coating thickness being less apparent.

Key words: epoxy coating electrochemical impedance spectroscopy water absorption adhesion

Received: 24 November 2023 32134.14.1005.4537.2023.375

ZTFLH:

TG174

Fund: High-tech Ship Research Project from the Ministry of Industry and Information Technology of China(MC-202003-Z01-02)

Corresponding Authors: ZHAO Dongyang, E-mail: dyzhao@imr.ac.cn

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	WANG Tiancong
	ZHAO Dongyang
	XIANG Xueyun
	WU Hang
	WANG Wen

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.375 OR https://www.jcscp.org/EN/Y2024/V44/I5/1361

Fig.1 Electrochemical cell for EIS measurements on coated samples

Table 1 |Z|_{0.1 Hz} values of the coatings after immersion

Fig.2 Equivalent circuit model for EIS analysis

Fig.3 Nyquist (a1-c1) and Bode (a2-c2) plots of the coatings with the thicknesses of 80-90 μm (a1, a2), 100-110 μm (b1, b2) and 140-150 μm (c1, c2) after immersion at 30^oC for different time

Fig.4 Nyquist (a1-c1) and Bode (a2-c2) plots of the coatings with the thicknesses of 80-90 μm (a1, a2), 100-110 μm (b1, b2) and 140-150 μm (c1, c2) after immersion at 40^oC for different time

Fig.5 Variations of R_c (a) and C_c (b) of the coatings with immersion time at 30^oC

Fig.6 Variations of R_c (a) and C_c (b) of the coatings with immersion time at 40^oC

Table 2 Fitting data of various parameters in the function equation (2)

Fig.7 Contour plots of the equivalent impedances as the functions of immersion time and coating thickness at 30^oC (a) and 40^oC (b)

Fig.8 Variations of OCP of the coatings with immersion time in NaCl solution at 30^oC (a) and 40^oC (b)

Fig.9 Time dependances of water absorptions of the coatings during immersion at 30^oC (a) and 40^oC (b)

Fig.10 Adhesions of the coatings after immersion in NaCl solution for different time at 30℃ (a) and 40℃ (b)

Fig.11 Macro-morphologies of the coatings with the thicknesses of 80~90 μm (a1-a3), 100~110 μm (b1-b3) and 140~150 μm (c1-c3) after immersion at 30^oC for 0 h (a1-c1), 1030 h (a2-c2) and 5350 h (a3-c3) and then adhesion test

Fig.12 Macro-morphologies of the coatings with the thicknesses of 80-90 μm (a1-a3), 100-110 μm (b1-b3) and 140-150 μm (c1-c3) after immersion at 40°C for 0 h (a1-c1), 1030 h (a2-c2) and 5350 h (a3-c3) and then adhesion test

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