Preparation and Anticorrosion Performance of Polyaniline/Vermiculite Modified Waterborne Epoxy Coatings

doi:10.11901/1005.3093.2015.12.904

Chinese Journal of Materials Research

2015, Vol. 29

Issue (12): 904-912 DOI: 10.11901/1005.3093.2015.12.904

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Preparation and Anticorrosion Performance of Polyaniline/Vermiculite Modified Waterborne Epoxy Coatings

Na WANG^1,^2,^**(

),Lidong HU¹,Miao SUN¹,Jing ZHANG¹,Hang WU³,Fuhui WANG³

1. School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2. School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
3. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Na WANG,Lidong HU,Miao SUN,Jing ZHANG,Hang WU,Fuhui WANG. Preparation and Anticorrosion Performance of Polyaniline/Vermiculite Modified Waterborne Epoxy Coatings. Chinese Journal of Materials Research, 2015, 29(12): 904-912.

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Abstract

The waterborne epoxy coatings with polyaniline/vermiculite (PANI/VMT) as pigment were prepared. For the sake of identifying the functional groups of PANI/VMT, FT-IR measurement was performed. The thermal behavior of the pigments was characterized by thermal gravimetric analysis (TGA). The anticorrosion performance of waterborne epoxy coatings with different mass ratio of PANI/VMT was evaluated by electrochemical impedance spectroscopy (EIS) and salt spray test. The results show that a proper combination of the anodic protection ability of polyaniline and barrier property of vermiculite results in better performance of the PANI/VMT modified waterborne epoxy coating, for example, a coating with addition of 0.5% of PANI/VMT could provide a long-lasting anticorrosion protection for steel substrate.

Key words: materials failure and protection waterborne epoxy resin polyaniline vermiculite anticorrosion coatings

Received: 13 January 2015

Fund: *Supported by Natural Science Foundation of Liaoning Province of China No.2015021016, International Cooperation Program of Science and Technology Bureau of Shenyang, China No.F15-200-6-01

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	Na WANG
	Lidong HU
	Miao SUN
	Jing ZHANG
	Hang WU
	Fuhui WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.12.904 OR https://www.cjmr.org/EN/Y2015/V29/I12/904

Fig.1 FT-IR spectra of VMT (a), PANI (b) and PANI/VMT (c)

Fig.2 TGA curves for determining mass loss of VMT (a) and PANI/VMT (b)

Fig.3 EIS spectra for EP varnish coating immersed in 3.5% NaCl solution after 1440 h ((a) Nyquist plot, (b) Bode magnitude plot and (c) Bode phase angle plot)

Fig.4 EIS spectra for EP/[PANI/VMT-0.3%] coating immersed in 3.5% NaCl solution after 1440 h ((a) Nyquist plot, (b) Bode magnitude plot and (c) Bode phase angle plot)

Fig.5 EIS spectra for EP/[PANI/VMT-0.5%] coating immersed in 3.5% NaCl solution after 1440 h ((a) Nyquist plot, (b) Bode magnitude plot and (c) Bode phase angle plot)

Fig.6 EIS spectra for EP/[PANI/VMT-0.7%] coating immersed in 3.5% NaCl solution after 1440 h ((a) Nyquist plot, (b) Bode magnitude plot and (c) Bode phase angle plot)

Fig.7 EIS spectra for EP/[PANI/VMT-1.0%] coating immersed in 3.5% NaCl solution after 1440 h ((a) Nyquist plot, (b) Bode magnitude plot and (c) Bode phase angle plot)

Fig.8 |Z|_0.1 variations curves of EP varnish, EP/[VMT-0.5%], EP/[PANI-0.5%] and EP/[PANI/VMT-0.5%] coatings with immersion time of 1440 h

Table 1 Corrosion potentials and corrosion rates of coating specimens

Fig.9 Tafel plots for (a) EP varnish, (b) EP/[PANI/VMT-0.3%], (c) EP/[PANI/VMT-0.5%], (d) EP/[PANI/VMT-0.7%] and (e) EP/[PANI/VMT-1.0%] coatings measured in 3.5% NaCl solution

Fig.10 Simulation of anticorrosion mechanism for PANI/VMT modified waterborne epoxy coating

Fig.11 Photographs of (a) EP varnish, (b) EP/[VMT-0.5%], (c) EP/[PANI-0.5%], (d) EP/[PANI/VMT-0.3%], (e) EP/[PANI/VMT-0.5%], (f) EP/[PANI/VMT-0.7%], (g) EP/[PANI/VMT-1.0%] coatings after exposure in salt spray of 5% NaCl solution for 600 h

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