Anticorrosion Mechanism of Epoxy Coating with Nano-flake Barium Phosphate

doi:10.11901/1005.3093.2015.296

Chinese Journal of Materials Research

2016, Vol. 30

Issue (3): 192-198 DOI: 10.11901/1005.3093.2015.296

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Anticorrosion Mechanism of Epoxy Coating with Nano-flake Barium Phosphate

SUN Wei¹, ZHU Liwei², LIU Fuchun^1,^**(

), HAN En-hou¹, KE Wei¹, QIAN Zhouhai², JIE Ganxin³

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
3. State Key Laboratory of Environmental Adaptability for Industrial Products, China National Electric Apparatus Research Institute Co., Ltd,Guangzhou 510633, China

Cite this article:

SUN Wei, ZHU Liwei, LIU Fuchun, HAN En-hou, KE Wei, QIAN Zhouhai, JIE Ganxin. Anticorrosion Mechanism of Epoxy Coating with Nano-flake Barium Phosphate. Chinese Journal of Materials Research, 2016, 30(3): 192-198.

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Abstract

Nano-flake barium phosphate was prepared by hydrothermal synthesis, and then the effect of which as pigment on the corrosion behavior of epoxy coating was investigated by means of electrochemical impedance spectroscopy (EIS) and salt spray tests. The results show that the nano-flake barium phosphate in the epoxy coating can react with iron oxide, the corrosion product of metal substraste, to generate an insoluble FePO₄ as a barrier on the corrosion spot, thereby to enhance the corrosion resistance of the coating; Among others, an epoxy coating with 5 mass% nano flake barium phosphate shows the highest corrosion resistance.

Key words: composite nanometer phosphate transmission line tower protection for electric power facilities

Received: 19 May 2015

ZTFLH:

TB174

Fund: *Supported by the Key Technology of Corrosion Control on Wind Power Equipment Academician Workstation Project 2013B090400023 and State Grid Practical Project No.zdk/gw001-2012.

About author: **To whom correspondence should be addressed, Tel: (024)23915895, E-mail: fcliu@imr.ac.cn

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	Wei SUN
	Liwei ZHU
	Fuchun LIU
	En-hou HAN
	Wei KE
	Zhouhai QIAN
	Ganxin JIE

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.296 OR https://www.cjmr.org/EN/Y2016/V30/I3/192

Fig.1 SEM micrograph diagram of nanometer barium phosphate

Fig.2 TEM micrograph of nanometer barium phosphate

Fig.3 XRD diagram of nanometer barium phosphate

Fig.4 Photos of the coated Q235 steel samples after salt spray test for 2000 h, (a) B0, (b) B1, (c) B₃and (d) B₅

Fig.5 SEM micrographs of the scribe sections of coated panels after 2000 h salt spray test. (a) B0, (b) B₁, (c) B₃ and (d) B₅

Fig.6 Bode plots of coated panels with different loading of nano-Ba₃(PO₄)₂ after different immersiong time in 3.5%NaCl solution, (a) B_0,(b) B₁, (c) B₃ and (d) B₅

Fig.7 Equivalent circuit models of the coated panels at different immersion stages. (a) with one time constant, (b) with two-time constant

Fig.8 The change of coating resistance with immersion time

Fig.9 The change of water absorption of the coatings with immersion time

Fig.10 XRD diagram of the interface between the coating and Q235 substrate

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