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Preparation and characterization of poly(o-anisidine)/SiC composites and study of their corrosion resistances blended with epoxy resin

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Abstract

To study the differences of structure and corrosion resistances of inorganic- and organic acid-doped poly(o-anisidine) (POA)/SiC composite (PSC), hydrochloric acid (HCl)- and dodecylbenzene sulfonic acid (DBSA)-doped PSCs were prepared by in situ polymerization of o-anisidine monomer in the presence of SiC nanoparticles. The structure and morphology of PSCs (PSC-HCl and PSC-DBSA) were characterized by Fourier transformation infrared spectroscopy, X-ray photoelectron spectroscopy, UV-visible spectroscopy, X-ray diffraction, field emission scanning electron microscopy, and energy-dispersive X-ray detector. The thermal stability was studied by thermal gravimetric analysis. Epoxy coating containing PSCs and POAs was prepared on the steel surfaces, and the mechanical properties, hydrophobic behavior, and corrosion resistances of the coatings were evaluated. The results showed that the addition of pigments could improve the peeling and scratching strengths, hydrophobic behavior, and corrosion resistances of epoxy coating, and PSC-DBSA coating improved more significantly. After 7 days immersed in 3.5% NaCl solution, the PSC-DBSA coating still had a lower corrosion rate of 1.23 × 10−3 mm/year and the protection efficiency was up to 90.70%. The excellent corrosion protection ability of PSC-DBSA coating was derived from the reversible redox of POA, the increased barrier effect of SiC, and the good compatibility of hydrophobic PSC-DBSA with epoxy resin. The protection mechanism provided by PSC-DBSA coating was also discussed.

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Acknowledgments

The authors would like to acknowledge the National Natural Science Foundation of China (Nos. 51474057, 51274057) and the Fundamental Research Funds for the Central Universities (Nos. N162502003, N162410002-15) for their financial support. The first author would also like to acknowledge Kai Yu for providing the FESEM testing.

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  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Chuanbo Hu, Ying Li & Yushi Ding

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  1. Chuanbo Hu
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Correspondence to Ying Li.

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Hu, C., Li, Y. & Ding, Y. Preparation and characterization of poly(o-anisidine)/SiC composites and study of their corrosion resistances blended with epoxy resin. Colloid Polym Sci 295, 1937–1950 (2017). https://doi.org/10.1007/s00396-017-4152-3

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  • DOI: https://doi.org/10.1007/s00396-017-4152-3

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