Corrosion Resistance of Three Zinc-rich Epoxy Coatings

doi:10.11902/1005.4537.2019.231

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 563-570 DOI: 10.11902/1005.4537.2019.231

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Corrosion Resistance of Three Zinc-rich Epoxy Coatings

ZHAO Shuyan¹,TONG Xinhong²,LIU Fuchun¹(

),WENG Jinyu²,HAN En-Hou¹,LI Xiaohui³,YANG Lin³

1. Key Laboratory of Nuclear Materials and Safety Evaluation, Chinese Academy of Sciences, Shenyang 110016, China
2. Fujian Huadian Kemen Power Generation Co. , Ltd. , Fuzhou 364400, China
3. Huadian Electric Power Research Institute Co. , Ltd. , Hangzhou 310030, China

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Abstract

Nano-composite coatings composed of nano-silica materials and Zn-rich epoxy coating were prepared, and their corrosion resistance was comparatively assessed with two zinc-rich epoxy coatings without addition of nano-silica by means of pull-off test for adhesion, immersion test, salt spray test and electrochemical impedance spectroscopy, as well as Zn content measurement. The results show that nanocomposite coatings have good performance in adhesion and cohesion, and they can act as good organic barrier to inward migration of corrosive species in the early corrosion stage, then present a moderate cathodic protection effect for a long term in the middle stage and finally the corrosion product of Zn can provide good barrier effect in the later stage, in the contrast, the two zinc-rich epoxy coatings without addition of nano-silica may prematurly break down due to blistering and rusting.

Key words: coating failure Zn-rich epoxy coating cathodic protection corrosion resistant power facility coastal environment

Received: 19 March 2019

ZTFLH:

TG174

Fund: China Huadian Technology Project and Shenyang Science and Technology Plan Project(Y17-1-039)

Corresponding Authors: Fuchun LIU E-mail: fcliu@imr.ac.cn

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	Shuyan ZHAO
	Xinhong TONG
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	Jinyu WENG
	En-Hou HAN
	Xiaohui LI
	Lin YANG

Cite this article:

ZHAO Shuyan,TONG Xinhong,LIU Fuchun,WENG Jinyu,HAN En-Hou,LI Xiaohui,YANG Lin. Corrosion Resistance of Three Zinc-rich Epoxy Coatings. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 563-570.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.231 OR https://www.jcscp.org/EN/Y2019/V39/I6/563

Fig.1 Images of coatings for adhesion test: (a) NF coating, (b) HH coating, (c) XS coating

Table 1 Data of coating adhesion

Fig.2 Images of NF coating (a1, a2), HF coating (b1, b2) and XS coating (c1, c2) samples after salt spray tests for 1000 h

Fig.3 SEM images of cross sections of NF coating (a1, a2), HH coating (b1, b2) and XS coating (c1, c2) samples after salt spray tests for 1000 h

Fig.4 EDS analysis of cross sections of three kinds of coating samples after salt spray tests for 1000 h: (a) positions 1 and 3, (b) positions 2 and 4, (c) positions 5 and 6 in Fig.3

Fig.5 SEM images of NF coating (a), HH coating (b) and XS coating (c) samples after salt spray tests for 1000 h

Fig.6 Images of three kinds of coating samples after immersion tests for 1500 h: (a) NF coating, (b) HH coating, (c) XS coating

Fig.7 Corrosion potential of the coated panels with differ-ent immersing time in 3.5%NaCl solution

Fig.8 Nyquist (a, c, e) and Bode (b, d, f) plots of NF coating (a, b), HH coating (c, d) and XS coating (e, f)

Fig.9 Equivalent electric circuit diagrams of the coated panels at early immersion (a), middle immersion (b) and later immersion (c): Q_c-coating capacitance, R_c-coating resistance, Q_Zn-Zn capacitance, R_Zn-Zn resistance, Q_dl-electric double layer capacitor, R_ct-charge transfer resistance

Fig.10 Change of resistance and capacitance with immersion time: (a) coating resistance, (b) coating capacitance, (c) resistance of Zn reaction product interface, (d) capacitance of Zn reaction product interface

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