Water Penetration Behavior of Epoxy Coating Based on Distribution of Relaxation Time and Finite Element Simulation

doi:10.11902/1005.4537.2023.131

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 489-496 DOI: 10.11902/1005.4537.2023.131

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Water Penetration Behavior of Epoxy Coating Based on Distribution of Relaxation Time and Finite Element Simulation

HAN Dongxiao¹, JI Wenhui², WANG Tong², WANG Wei²(

)

^1.Beijing Shiny Tech. Co. Ltd., Beijing 100039, China
^2.School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

Cite this article:

HAN Dongxiao, JI Wenhui, WANG Tong, WANG Wei. Water Penetration Behavior of Epoxy Coating Based on Distribution of Relaxation Time and Finite Element Simulation. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 489-496.

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Abstract

In fact, the variation of water content within an organic coating will affect its corrosion protection performance. Thus, the penetration of water in an epoxy coating would be studied via distribution of relaxation time (DRT) technique and finite element simulation method in terms of the perspective of micro electrochemistry in this article. Results show that the water penetration process of the epoxy coating may be differentiated into three stages: initial stage, saturation stage and failure stage. In the three stages, the different content of water and corrosive medium inside the coating can seriously affect the variation of capacitance of the coating. This paper provides a new comprehensive analysis method for the mechanism study of organic protective coatings.

Key words: epoxy coating water penetration distribution of relaxation time finite element simulation corrosion mechanism

Received: 04 May 2023 32134.14.1005.4537.2023.131

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(42076039)

Corresponding Authors: WANG Wei, E-mail: wangwei8038@ouc.edu.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.131 OR https://www.jcscp.org/EN/Y2024/V44/I2/489

Fig.1 Nyquist (a) and Bode (b) plots of water seepage process of epoxy coating

Fig.2 Equivalent circuit model of water seepage process of epoxy coating

Fig.3 DRT plots of water seepage process of epoxy coating: (a) 1-60 d, (b) 10-60 d

Fig.4 DRT peaks-splitting plots of water seepage process of epoxy coating: (a) 1 d, (b) 2 d, (c) 3 d, (d) 10 d, (e) 20 d, (f) 30 d, (g) 40 d, (h) 50 d, (i) 60 d

Table 1 DRT analysis of time constant position and area ration of water seepage process of epoxy coating

Fig.5 Change diagram of OCP (a) and |Z|_{0.01 Hz} (b) in water seepage process of epoxy coating

Fig.6 Change diagram of C_c in water seepage process of epoxy coating

Fig.7 Location monitoring points in the coating (a) and simulation change plots of Cl^- concentration of location monitoring points in water seepage process of epoxy coating (b)

Fig.8 Simulation change diagram of concentration of Cl^- in water seepage process of epoxy coating

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