Anticorrosion Performance of Epoxy Coating Modified with Nanocontainers

doi:10.11902/1005.4537.2017.010

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (2): 133-139 DOI: 10.11902/1005.4537.2017.010

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Anticorrosion Performance of Epoxy Coating Modified with Nanocontainers

Bei QIAN¹(

), Chengbao LIU², Zuwei SONG¹, Junfeng REN¹

1 College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
2 Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;

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Abstract

Nano-containers were synthesized via layer by layer (LbL) self-assembly technique with SiO₂ as core and alternative layers of chitosan and polyaspartic acid inhibitor as shell. Then nano-containers modified epoxy coatings were prepared and applied on carbon steel Q235. The nano-containers were characterized by means of Malvern laser particle size analyzer, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). In addition, the electrochemical behavior of epoxy coatings/Q235 systems with and without nano-containers in 3.5% (mass fraction) NaCl solution were investigated through electrochemical impendence spectroscopy (EIS). Results indicated that the corrosion resistance of epoxy coatings had been greatly increased by the incorporating nano-containers, which can effectively reduce the diffusion of water in coating matrix and enhance the coating impedance for corrosion reaction. The impedance value of the modified epoxy coating may be maintained by above 10⁵ Ω·cm² even after 120 h immersion, revealing the enhanced anticorrosion performance.

Key words: nanocontainer epoxy coating inhibitor anticorrosion performance Q235 mild steel

Received: 16 January 2017

Fund: Supported by Natural Science Foundation of Shandong Province (ZR2017BD038) and Research Foundation for Distinguished Scholars of Qingdao Agricultural University (6631115017)

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Cite this article:

Bei QIAN, Chengbao LIU, Zuwei SONG, Junfeng REN. Anticorrosion Performance of Epoxy Coating Modified with Nanocontainers. Journal of Chinese Society for Corrosion and protection, 2018, 38(2): 133-139.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.010 OR https://www.jcscp.org/EN/Y2018/V38/I2/133

Fig.1 Zeta-potential of nanocontainers

Fig.2 FT-IR spectra of nanocontainers

Fig.3 SEM images of nanocontainers (a) and the magnified image of the square area in Fig.3a (b)

Fig.4 Optical photographies of S₀ (a1~a5), S₁ (b1~b5) and S₂ (c1~c5) systems after immersion in 3.5%NaCl solution for 1 h (a1, b1, c1), 5 h (a2, b2, c2), 24 h (a3, b3, c3), 72 h (a4, b4, c4) and 120 h (a5, b5, c5)

Fig.5 Impedance module (a, d), phase angle (b, e) and Nyquist (c, f) plots of scratched S₂ (a~c) and S₀ (d~f) coating systems after immersion in 3.5%NaCl solution for 1~5 h

Fig.6 Equivalent circuit of scratched coating systems after immersion in 3.5%NaCl solution for 1~5 h

Fig.7 Impedance module (a, d), phase angle (b, e) and Nyquist (c, f) plots of scratched S₂ (a~c) and S₀ (d~f) coating systems after immersion in 3.5%NaCl solution for 24~120 h

Fig.8 Equivalent circuits of scratched S₀ (a) and S₂ (b) coating systems after immersion in 3.5%NaCl solution for 24~120 h

Table 1 Impedance parameters obtained by ZSimpWin simulation for scratched S₀ and S₂ coatings in 3.5%NaCl solution

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