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Anti-corrosion performance of aniline trimer-containing sol–gel hybrid coatings for mild steel substrate

  • Original Paper: Sol–gel and hybrid materials with surface modification for applications
  • Published:
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Abstract

Novel electroactive sol–gel hybrid coatings were synthesized by hydrolysis and condensation reaction of tetraethoxysilane (TEOS) and different mass ratios of silane-capped aniline trimer (TSUPQD) on the surface of Q235 steel. Microstructure, thermal stability, and corrosion resistance of as-prepared hybrid coatings were characterized by FTIR, UV–Vis, SEM, TGA, CA measurement, polarization curve, and electrochemical impedance spectroscopy. It could be seen that the icorr value of as-prepared novel coating was markedly lower than those of pure TEOS-based coating and bare substrate. EIS results indicated that the impedance of hybrid coating was higher than that of Q235 steel substrate, indicating the effective protective property for substrate. Meanwhile, the aniline trimer-based hybrid coatings presented much higher impedance after immersion in 3.5 wt% NaCl for 200 h, and the best corrosion performance was acquired when the mass ratio of TEOS/TSUPQD is 100:4. The XRD and SEM analysis of the corrosion product beneath the hybrid coatings showed that the redox catalytic capability of aniline trimer could induce the Q235 substrate to form the passive films which mainly consisted of Fe2O3 and Fe3O4.

Highlights

  • Novel electroactive sol-gel hybrid coatings is successfully achieve in this paper.

  • Corrosion property of aniline trimer containing hybrid coatings is obvious improved.

  • The corrosion property is best when the mass ratio of TESO/TSUPQD is 100:4.

  • The corrosion products mainly contain α-Fe2O3, α-Fe2(OH)3Cl and Fe3O4.

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Acknowledgements

The authors gratefully appreciate financial support provided by the National Key R&D Program of China (No. 2016YFE0203600); the “One Hundred Talented People” of the Chinese Academy of Sciences (No. Y60707WR04); the Natural Science Foundation of Zhejiang Province (No. Y16B040008); the National Basic Research Program of China (973 Program project, No. 2014CB643300); the Ningbo Municipal Nature Science Foundation (No. 2016A610267).

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Correspondence to Haichao Zhao, Liping Wang or Xiaogang Li.

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Ye, Y., Liu, W., Liu, Z. et al. Anti-corrosion performance of aniline trimer-containing sol–gel hybrid coatings for mild steel substrate. J Sol-Gel Sci Technol 87, 464–477 (2018). https://doi.org/10.1007/s10971-018-4716-9

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  • DOI: https://doi.org/10.1007/s10971-018-4716-9

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