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Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline–epoxy composite coating for Q235 steel

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Abstract

Polyaniline (PANI) nanofibers were prepared by direct mixed oxidation in four kinds of inorganic acids. The characterization of scanning electron microscopy (SEM) showed that high quality PANI fibers with uniform diameter and several microns length can be obtained by direct mixed oxidation, especially in a sulfuric acid system. Structural characteristics of PANI products through IR and UV spectra indicated the consistent peak distribution with the classic spectrum of the doped PANI. In addition, composite coatings of PANI–epoxy resin were prepared by mechanical grinding. The effect of PANI’s content on anticorrosion property of the composite coatings for Q235 steel was studied by the electrochemical impedance spectroscopy (EIS). Results showed that the best shielding protective effect was obtained when the amount of PANI was around 0.5% (wt%). More importantly, the effects of four different inorganic acids on anticorrosion property of the composite coatings were studied by the EIS and Tafel polarization curve. Experiments showed that the different composite coatings of PANI doped by different inorganic acids provided different protective abilities for the Q235 steel. It can be concluded that both the morphology and counter-anion would impact the anticorrosion effect of the doped PANI.

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Acknowledgments

The authors gratefully acknowledge the financial support provided by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-210) and the National Science & Technology Support Project, China (2007BAB27B02).

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Authors and Affiliations

  1. Institute of Oceanology, Chinese Academy of Sciences, No. 7 Nanhai Road, Qingdao, 266071, China

    Cheng Yue Ge, Xiao Gang Yang & Bao Rong Hou

  2. Graduate School of the Chinese Academy of Sciences, No. 19 Yuquan Road, Beijing, 100049, China

    Cheng Yue Ge

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Correspondence to Bao Rong Hou.

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Ge, C.Y., Yang, X.G. & Hou, B.R. Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline–epoxy composite coating for Q235 steel. J Coat Technol Res 9, 59–69 (2012). https://doi.org/10.1007/s11998-010-9316-8

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  • DOI: https://doi.org/10.1007/s11998-010-9316-8

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