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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.
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Received: 16 January 2017
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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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