Preparation of Polyaniline Microemulsion and Anticorrosion Performance of Its Composite Coatings with Versatate-Fluoro-Acrylate Emulsion

doi:10.11901/1005.3093.2015.042

Chinese Journal of Materials Research

2016, Vol. 30

Issue (2): 131-140 DOI: 10.11901/1005.3093.2015.042

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Preparation of Polyaniline Microemulsion and Anticorrosion Performance of Its Composite Coatings with Versatate-Fluoro-Acrylate Emulsion

LI Yufeng^1,^**(

), ZHU Jingjing², GAO Xiaohui², XU Ying¹

1. College of Material Science and Engineering, Qiqihar University, Qiqihar 161006, China
2. College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China

Cite this article:

LI Yufeng, ZHU Jingjing, GAO Xiaohui, XU Ying. Preparation of Polyaniline Microemulsion and Anticorrosion Performance of Its Composite Coatings with Versatate-Fluoro-Acrylate Emulsion. Chinese Journal of Materials Research, 2016, 30(2): 131-140.

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Abstract

Polyaniline (PANI) microemulsion, which is miscible with acrylate emulsion, was synthesized with sodium dodecyl sulfate (SDS) as emulsifier. PANI/VFAc composite emulsions were prepared by blending PANI microemulsion and the versatate modified acrylate emulsion containing fluorine (versatate-fluoro-acrylate emulsion, VFAc). Then PANI/VFAc composite emulsion was applied on Q235 steel surface to prepare the composite anticorrosion coatings. The molecular structure and particle size of PANI were characterized by Fourier transformation infrared spectrum (FT-IR), transmission electron microscopy (TEM) and particle size analyzer. The influence of different proportion of PANI microemulsion and VFAc emulsion on properties such as hydrophobic, wet adhesion and anticorrosion of the formed coatings was studied. The results show that the composite coating exhibits the best hydrophobic property and corrosion resistance when the proportion of PANI microemulsion and VFAc emulsion is 1: 2. The anticorrosion mechanism of PANI/VFAc composite coating on Q235 steel was proposed.

Key words: organic polymer materials polyaniline microemulsion versatate-fluoro-acrylate composite coatings anticorrosion

Received: 20 January 2015

ZTFLH:

TB324

Fund: *Supported by Postdoctoral Science-research Developmental Foundation of Heilongjiang Province of China No.LBH-Q13171 and Natural Science Foundation of Heilongjiang Province of China No.E201138

About author: **To whom correspondence should be addressed, Tel: (0)15145240877, E-mail: lyf1170@163.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.042 OR https://www.cjmr.org/EN/Y2016/V30/I2/131

Fig.1 FTIR spectra of PANI

Fig.2 TEM photograph of PANI emulsion paticles

Fig.3 Particle size distribution of PANI microemulsion

Fig.4 Relationship between contact angle of different proportion of PANI/VFAc composite coatings and contact time

Table 1 Water absorption, wet adhesion and fitting values of potentiodynamic polarization curves for Q235 steel coated by the PANI/VFAc composite coatings

Fig.5 Potentiodynamic polarization curves for Q235 steel coated by different proportion of PANI/VFAc composite coatings

Fig.6 EIS for Q235 steel coated by (a) PANI coating and different proportion of PANI/VFAc composite of (b) 3∶1, (c) 2∶1, (d) 1∶1, (e) 1∶2, (f) 1∶3

Fig.7 Equivalent circuit of EIS with the coatings in different immersing time

Fig.8 Salt spray test photos for Q235 steel coated by (a, a1) PANI coating and different proportion of PANI/VFAc composite of (b, b1) 3∶1, (c, c1) 2∶1, (d, d1) 1∶1, (e, e1) 1∶2, (f, f1) 1∶3

Fig.9 SEM photo of (a) Q235 steel surface, (b) the underlying Q235 steel surface for the PANI/VFAc coating after 24h immersed in 3.5% NaCl solution

Fig.10 XPS survey spectra(a,c) and XPS spectrum of O 1s(b,d) of the steel surface and the steel surface underlying PANI/VFAc coating after 24 h immersed in 3.5% NaCl solution

Fig.11 Anticorrosion mechanism of PANI/VFAc composite coating on Q235 steel

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