Failure Behavior of Fresh Water Tank Coating in Different Water

doi:10.11902/1005.4537.2021.008

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (2): 209-218 DOI: 10.11902/1005.4537.2021.008

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Failure Behavior of Fresh Water Tank Coating in Different Water

CAO Jingyi¹, YANG Yange²(

), FANG Zhigang¹, SHOU Haiming³, LI Liang¹, FENG Yafei¹, WANG Xingqi², CHU Guangzhe¹, ZHAO Yi¹

^1.Unit 92228, People's Liberation Army, Beijing 100072, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Unit 92942, People's Liberation Army, Beijing 100161, China

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Abstract

Failure behavior of epoxy coating used for fresh water tank, namely epoxy coating/Q235 carbon steel, in different media including three different fresh water and one kind of salt water was investigated by means of adhesion test, water absorption test and electrochemical impedance spectroscopy. Failure of the epoxy coating in fresh water was earlier than that in salt water owing to the faster penetration rate. The failure process of the epoxy coating in fresh waters, including reverse osmosis water, conditioning water and drinking water was similar, and can be differentiated as the following three stages: the quick penetration of water, corrosion of the substrate at the interface of coating/steel and the corrosion inhibition of pigments in the coating.

Key words: coating fresh water corrosion electrochemical impedance spectroscopy

Received: 13 January 2021

ZTFLH:

TG174

Corresponding Authors: YANG Yange E-mail: ygyang@imr.ac.cn

About author: YANG Yange, E-mail: ygyang@imr.ac.cn

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	Jingyi CAO
	Yange YANG
	Zhigang FANG
	Haiming SHOU
	Liang LI
	Yafei FENG
	Xingqi WANG
	Guangzhe CHU
	Yi ZHAO

Cite this article:

CAO Jingyi, YANG Yange, FANG Zhigang, SHOU Haiming, LI Liang, FENG Yafei, WANG Xingqi, CHU Guangzhe, ZHAO Yi. Failure Behavior of Fresh Water Tank Coating in Different Water. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 209-218.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.008 OR https://www.jcscp.org/EN/Y2021/V41/I2/209

Table 1 Properties of ROW and CW

Fig.1 Adhesion vs time of the fresh water tank coating in different water

Fig.2 Macr-morphologies of the coating after adhesion test with immersion in salt water (a) and drinking water (b) at 0 h (a1, b1), 240 h (a2, b2), 480 h (a3, b3), 720 h (a4, b4) and 1200 h (a5, b5)

Fig.3 Water adsorption curve of the coating in salt water and drinking water

Fig.4 OCP vs time of the coating in salt water (a) and drinking water (b)

Fig.5 Nyquist (a, d, g), modules (b, e, h) and phase angle (c, f, i) plots of the fresh tank coating in salt water during immersion for 0~96 h (a~c), 96~600 h (d~f) and 600~1200 h (g~i)

Fig.6 Nyquist (a, d, g), modules (b, e, h) and phase angle (c, f, i) plots of the fresh tank coating in drinking water during immersion for 0~96 h (a~c), 96~600 h (d~f) and 600~1200 h (g~i)

Fig.7 Low-frequency modules vs time of the fresh tank coating in different water

Fig.8 Adhesion vs time of the fresh water tank coating in different water

Fig.9 Macr-morphologies of the coating after adhesion test with immersion in reverse osmosis water (a) and conditioned water (b) for 0 h (a1, b1), 240 h (a2, b2), 480 h (a3, b3), 720 h (a4, b4) and 1200 h (a5, b5)

Fig.10 Water adsorption curves of the coating in different fresh water

Fig.11 OCP vs time of the coating in three different fresh water

Fig.12 Nyquist (a, d, g), modules (b, e, h) and phase angle (c, f, i) plots of the fresh tank coating in reverse osmosis water during immersion for 0~96 h (a~c), 96~600 h (d~f) and 600~1200 h (g~i)

Fig.13 Nyquist (a, d, g), modules (b, e, h) and phase angle (c, f, i) plots of the fresh tank coating in conditioned water during immersion for 0~96 h (a~c), 96~600 h (d~f) and 600~1200 h (g~i)

Fig.14 Low-frequency modules vs time of the fresh tank coating in different water for 0~96 h (a), 96~600 h (b) and 600~1200 h (c)

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