Degradation Behavior of a Modified Epoxy Coating in Simulated Deep-sea Environment

doi:10.11902/1005.4537.2016.035

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (3): 247-263 DOI: 10.11902/1005.4537.2016.035

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Degradation Behavior of a Modified Epoxy Coating in Simulated Deep-sea Environment

Hongyang GAO,Wei WANG,Likun XU(

),Li MA,Zhangji YE,Xiangbo LI

State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute,Qingdao 266101, China

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Abstract

The degradation behavior of a modified epoxy resin coating was comparatively studied in sea water at atmospheric pressure and in a simulated deep-sea environment with high hydrostatic pressure of 6 MPa by means of electrochemical impedance spectroscopy (EIS), 3D optical microscope and scanning electron microscope (SEM). The results showed that the resistance of the coating decreased to 10⁵ Ωcm² after 30 d immersion under high hydrostatic pressure, while that decreased to 10⁸ Ωcm² at atmospheric pressure. The deep-sea environment can induce the enlargement of the active area and shorten the water-saturation process of coatings, therewith, the corrosion rate of the substrate was instantly accelerated. SEM showed that the hydrostatic pressure can deteriorate the attachment of pigments with the epoxy and weaken the adhesion between the epoxy coatings and the metal substrate. In this case, the active area of corrosion was enlarged, whilst the degradation of coatings and the corrosion of the steel substrate simultaneously occurred.

Key words: deep sea environment with high pressure modified epoxy coating electrochemical impedance spectroscopy coating degradation

Received: 19 March 2016

Fund: Supported by National Natural Science Foundation of China (51401185)

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	Hongyang GAO
	Wei WANG
	Likun XU
	Li MA
	Zhangji YE
	Xiangbo LI

Cite this article:

Hongyang GAO,Wei WANG,Likun XU,Li MA,Zhangji YE,Xiangbo LI. Degradation Behavior of a Modified Epoxy Coating in Simulated Deep-sea Environment. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 247-263.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.035 OR https://www.jcscp.org/EN/Y2017/V37/I3/247

Fig.1 Nyquist (a, b) and Bode (c, d) plots of the modified epoxy coating immersed in sea water for different time at atmospheric pressure (Scattered points: experimental data, solid lines: fitting results)

Fig.2 Equivalent circuit model of R_s(C_cR_c)

Fig.3 Nyquist (a, b) and Bode (c, d) plots of the modified epoxy coating immersed in sea water for different time at 6 MPa (Scattered points: experimental data, solid lines: fitting results)

Fig.4 Equivalent circuit models of R_s(Q_cR_c) (a) and R_s(Q_c(R_c(Q_dlR_ct))) (b)

Fig.5 Impendences determined at 0.01 Hz for the epoxy coating after immersion for different periods in sea water at atmospheric pressure and 6 MPa pressure

Fig.6 Capacitance (a) and pore resistance (b) vs time curves of the modified epoxy coating immersed in sea water under atmospheric and 6 MPa pressures

Fig.7 Q_dl (a) and R_ct (b) vs time curves of the coated steel after immersion in sea water for 9 d under 6 MPa pressure

Fig.8 Evolutions of water absorption rates of the modified epoxy coating immersed in sea water under atmospheric and 6 MPa pressures

Fig.9 Surface morphologies of the modified epoxy coating before immersion test in sea water at atmo-spheric (a) and 6 MPa (b) pressures

Fig.10 Surface morphologies of the modified epoxy coating after immersion in sea water for 30 d at atmospheric (a) and 6 MPa (b) pressures

Fig.11 SEM images of the modified epoxy coating immersed in sea water for 30 d at atmospheric (a) and 6 MPa (b) pressures after pull-off tests

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