Corrosion Behavior of PANI Nanofiber/Modified GO/Waterborne Epoxy Composite Coating on Stainless Steel

doi:10.11902/1005.4537.2020.271

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 156-162 DOI: 10.11902/1005.4537.2020.271

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Corrosion Behavior of PANI Nanofiber/Modified GO/Waterborne Epoxy Composite Coating on Stainless Steel

LI Jianyong¹, DAI Dianyu², QIAN Chen², DIAO Shulei¹, LIU Jinshan¹, LU Tongxin¹, SUN Yong¹, XIAO Fengjuan²(

)

^1.Shijiazhuang Yida Henglian Road and Bridge Materials Co. Ltd. , Shijiazhuang 050000, China
^2.School of Material Scinece and Engineering of Shijiazhuang Tiedao University, Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, Shijiazhuang 050043, China

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Abstract

Composite of polyaniline nanofiber/modified graphene oxide (PANI-F/CTGO) was synthesized by in-situ copolymerization in a non-hydrochloric acid medium. PANI-F/CTGO was introduced into waterborne epoxy polymer emulsion (WEP) as an anti-corrosion component to form composite coatings. The anticorrosion effect of the composite coating on stainless steel was assessed by means of salt spray test, electrochemical method, Fourier transform infrared spectroscope, SEM and XRD. Results show that the chemical bonding between PANI-F and CTGO improved the dispersion and compatibility of PANI-F/CTGO in epoxy emulsion. PANI nanofibers prepared in non-hydrochloric acid medium is conducive to better corrosion resistance of the coating due to that there is no corrosive HCl was involved into the prepared coating. PANI-F/CTGO/WEP coatings showed high open circuit potential and impedance modulus in 3.5%NaCl solution after salt spray test for 240 h, indicating their excellent corrosion protection performance. Meanwhile, the mechanism of synergism of active passivation and physical barrier of PANI-F/CTGO was revealed.

Key words: non-hydrochloric acid copolymerization PANI nanofiber modified GO nanosheet waterborne epoxy composite coating adsorption and active passivation

Received: 23 December 2020

ZTFLH:

TG172

Fund: Key Research and Development Projects in Hebei Province(17273702D);Natural Science Foundation of Hebei Province(2016210)

Corresponding Authors: XIAO Fengjuan E-mail: fengjuanxiao@stdu.edu.cn

About author: XIAO Fengjuan, E-mail: fengjuanxiao@stdu.edu.cn

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	Jianyong LI
	Dianyu DAI
	Chen QIAN
	Shulei DIAO
	Jinshan LIU
	Tongxin LU
	Yong SUN
	Fengjuan XIAO

Cite this article:

LI Jianyong, DAI Dianyu, QIAN Chen, DIAO Shulei, LIU Jinshan, LU Tongxin, SUN Yong, XIAO Fengjuan. Corrosion Behavior of PANI Nanofiber/Modified GO/Waterborne Epoxy Composite Coating on Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 156-162.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.271 OR https://www.jcscp.org/EN/Y2022/V42/I1/156

Fig.1 SEM surface micrographs (a~f) and cross-sectional morphologies (g~i) of GO (a), CTGO (b), PANI-F (c), 0.1%PANI-F-CTGO/WEP (d, g), 0.3%PANI-F-CTGO/WEP (e, h) and 0.5% PANI-F-CTGO/WEP (f, i)

Fig.2 XRD patterns (a) and FT-IR spectra (b) of GO，CTGO，PANI-F and three PANI-F/CTGO composites

Fig.3 Variations of OCP values of various coatings on the steel after immersion in 3.5%NaCl solution for 20 d

Fig.4 Potentiodynamic polarization curves of various coatings in 3.5%NaCl solution at room temperature

Table 1 Fitting electrochemical parameters of potentiodynamic polarization curves of various coatings

Fig.5 Nyquist (a) and Bode (b) plots of various coatings immersed in 3.5%NaCl solution for 48 d

Fig.6 Surface images of various coatings after 720 h salt spray test

Fig.7 XRD patterns of corrosion products formed beneath the coatings

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