Failure Process of Epoxy Coating Subjected Test of Alternating Immersion in Artificial Seawater and Dry in Air

doi:10.11902/1005.4537.2018.152

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 571-580 DOI: 10.11902/1005.4537.2018.152

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Failure Process of Epoxy Coating Subjected Test of Alternating Immersion in Artificial Seawater and Dry in Air

WANG Guirong^1,²,ZHENG Hongpeng¹,CAI Huayang¹,SHAO Yawei¹(

),WANG Yanqiu¹,MENG Guozhe¹,LIU Bin¹

1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2. Aviation Industry Chengdu Aircraft Industry (Group) Co. , Ltd. , Chengdu 610092, China

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Abstract

The failure process of the epoxy coating subjected to test of alternating immersion in artificial seawater and dry in air was studied by means of electrochemical impedance technique (EIS), Fourier transform infrared spectrometry (FT-IR), scanning electronic microscope (SEM), adhesion test and water absorption measurement. The results showed that, in the earlier test period, the epoxy coating subjected to wed-dry cycle test presents higher protectiveness than that subjected to merely immersion test. At the last test period, the former coating failed faster than the later one. The failure mechanism of the epoxy coating during wet-dry cycle testing may be proposed as that the coating matrix underwent alternate absorption and loss of water during the test, correspondingly, the relevant swelling and shrinking may generate more porosity within the coating, as a result, mechanical damages, such as cracks may develop from the interior to the surface of the coating, leads to lower adhesion and blisters of the coating eventually.

Key words: epoxy coating dry-wet cycle porosity of the coating blisters failure

Received: 23 October 2018

ZTFLH:

TG174.461

Fund: National Key R&D Program of China(2016YFB0300604)

Corresponding Authors: Yawei SHAO E-mail: shaoyawei@hrbeu.edu.cn

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	Guirong WANG
	Hongpeng ZHENG
	Huayang CAI
	Yawei SHAO
	Yanqiu WANG
	Guozhe MENG
	Bin LIU

Cite this article:

WANG Guirong,ZHENG Hongpeng,CAI Huayang,SHAO Yawei,WANG Yanqiu,MENG Guozhe,LIU Bin. Failure Process of Epoxy Coating Subjected Test of Alternating Immersion in Artificial Seawater and Dry in Air. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 571-580.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.152 OR https://www.jcscp.org/EN/Y2019/V39/I6/571

Fig.1 Schematic diagram of experimental device

Fig.2 Nyquist (a~c) and Bode (a1~c1) plots of the coating in the earlier period (a, a1), middle period (b, b1) and late period (c, c1) of full immersion

Fig.3 Nyquist (a~c) and Bode (a1~c1) plots of the coating in the earlier period (a, a1), middle period (b, b1) and late period (c, c1) of alternating wetting-drying exposure

Fig.4 Variations of electrochemical impedance (|Z|_{0.01 Hz}) of the coating during full immersion and alternating wetting-drying exposure

Fig.5 Macro morphologies of the coating after full immersion for 2050 h (a) and alternating wetting-drying exposure for 210 cycles (b)

Fig.6 Variations of adhesion of the coating during full immersion and alternating wetting-drying exposure

Fig.7 Macro morphologies of the coating fully immersed for 0 h (a), 300 h (b) and 2500 h (c) after pull-off test

Fig.8 Macro morphologies of the coating exposed in alternating wet-dry condition for 0 h (a), 300 h (b) and 2500 h (c) after pull-off test

Fig.9 FT-IR spectra of the coating failured after full immersion and alternating wetting-drying exposure: (a) 4000~500 cm^-1; (b) 2000~500 cm^-1

Fig.10 Equivalent electrical circuits of EIS of the coating in the earlier period (a), middle period (b) and late period (c) of full immersion and alternating wetting-drying exposue

Fig.11 Variations of electric resistance of the coating during full immersion and alternating wetting-drying exposure

Fig.12 Variations of the porosity of the coating during full immersion and alternating wetting-drying exposure

Fig.13 SEM images of the coating after full immersion for 2050 h (a) and alternating wetting-drying exposure for 210 cycles (b) and the magnified images of areas I in Fig.13a (c) and III in Fig.13b (d)

Fig.14 SEM images of the cross section of the coating before (a) and after full immersion for 2050 h (b) and alternating wetting-drying exposure for 210 cycles (c)

Fig.15 Variations of water absorption of the coating with time during alternating wetting-drying exposure

Fig.16 Failure mechanism model of the epoxy coating in alternating wetting-drying condition

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