Effect of Alternating Pressure on Electrochemical Behavior of Solvent-free Epoxy Coating in Simulated Ultra-deep Sea Environment

doi:10.11902/1005.4537.2022.133

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 929-938 DOI: 10.11902/1005.4537.2022.133

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Effect of Alternating Pressure on Electrochemical Behavior of Solvent-free Epoxy Coating in Simulated Ultra-deep Sea Environment

WANG Tengyu¹^,², ZHANG Zhenggui¹, LU Weizhong²(

), WU Xige³

1. School of Mechanical Engineering, Shenyang University, Shenyang 110018, China
2. Ningbo Institute of materials technology and engineering, Chinese Academy of Sciences, Ningbo 315200, China
3. DaQing Qinglu Langrun Technology Co. Ltd., Daqing 163316, China

Cite this article:

WANG Tengyu, ZHANG Zhenggui, LU Weizhong, WU Xige. Effect of Alternating Pressure on Electrochemical Behavior of Solvent-free Epoxy Coating in Simulated Ultra-deep Sea Environment. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 929-938.

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Abstract

The failure behavior of epoxy powder coating and solvent-free epoxy liquid coating in simulated ultra-deep-sea environment for 480 h was studied by means of EIS and LEIS, while by applied alternating pressures within ranges 0.1-20 and 0.1-30 MPa respectively. The effect of alternating pressure on the corrosion resistance of coatings in deep-sea was examined, and the surface morphology of the coating/Q345 steel interface after immersion was characterized by SEM. The results show that the failure process of the two coatings is obvious under the alternating pressure of 0.1-30 MPa. After 480 h of pressured immersion, the impedance value of the epoxy powder coating decreased by 2 and 1 orders of magnitude after 480 h immersion at 0.1-30 and 0.1-20 MPa alternating pressures, respectively, and the impedance value of the solvent-free epoxy liquid coating decreased by 3 and 2 orders of magnitude respectively after immersion in the same environment. It shows that the epoxy powder coating has better protection performance to the Q345 steel in the condition of alternating pressure, and the ability to block ion penetration is stronger. According to the LEIS results, the failure behavior of the coating gradually spreads from local sites to the whole area under the alternating pressure, and the greater the alternating pressure, the faster the spread rate of the localized damage of the coating.

Key words: alternating pressure solvent-free epoxy coating ultra-deep sea electrochemical behavior failure behavior

Received: 05 May 2022

ZTFLH:

TG174.5

Fund: Ningbo "13th Five-Year" Marine Economy Innovation and Development Demonstration Project(NBHY-2019-Z7)

About author: LU Weizhong, E-mail: wzlu@nimte.ac.cn

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	Tengyu WANG
	Zhenggui ZHANG
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	Xige WU

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.133 OR https://www.jcscp.org/EN/Y2022/V42/I6/929

Fig.1 Nyquist (a, b) and Bode (c, d) results of coating A after immersion for 480 h under 0.1-30 MPa alternating pressure

Table 1 Fitting results of EIS parameters of epoxy powder coating during 480 h immersion at 0.1-30 MPa alternating pressure

Fig.2 Nyquist (a-c) and Bode (d, e) results of coating B after immersion for 480 h under 0.1-30 MPa alternating pressure

Table 2 Fitting results of EIS parameters of epoxy liquid coating during 480 h immersion under 0.1-30 MPa alternating pressure

Fig.3 Nyquist (a) and Bode (b, c) results of coating A after immersion for 480 h under 0.1-20 MPa alternating pressure

Fig.4 Nyquist (a-c) and Bode (d, e) results of coating B after immersion for 480 h under 0.1-20 MPa alternating pressure

Fig.5 Variation curves of R_c after immersion of coating A and coating B under 0.1-30 MPa (a) and 0.1-20 MPa (b) alternating pressures for 480 h

Fig.6 Variation curves of Q_c after immersion of coating A and coating B under 0.1-30 MPa (a) and 0.1-20 MPa (b) alternating pressures for 480 h

Fig.7 LEIS results of the coatings A (a, c) and B (b, d) after immersion under 0.1-30 MPa (a, b) and 0.1-20 MPa (c, d) alternating pressure for 480 h

Table 3 Comparison of LEIS data of two coatings after immersion for 480 h

Table 4 Elemental analysis of Q345 substrate surface after coating A and coating B were immersed under alternating pressure of 0.1-30 and 0.1-20 MPa for 480 h (mass fraction / %)

Fig.8 Surface SEM images of the coatings A (a, c) and B (b, d) after immersion under 0.1-30 MPa (a, b) and 0.1-20 MPa (c, d) alternating pressure for 480 h

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