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Mica/polypyrrole (doped) composite containing coatings for the corrosion protection of cold rolled steel

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Abstract

Micas/polypyrroles (PPys) doped with molybdate, p-toluene sulfonate, dodecyl benzene sulfonate, and 2-naphthalene sulfonate composite pigments were synthesized by chemical oxidative polymerization and characterized in coatings for corrosion protection on cold rolled steel substrate by various electrochemical techniques. Synthesized composite pigments were characterized for morphology by scanning electron microscopy, which indicated physical formation of PPy on the surface of mica. Chemical composition of the composite pigments was analyzed by X-ray photoelectron spectroscopy which chemically confirmed doped PPy formation on the mica surface. Coatings were formulated at 20% pigment volume concentration (composite pigments or as-received mica pigment) and were applied on cold rolled steel substrate. Coatings were exposed to salt spray test conditions (ASTM B117) for 30 days and were periodically assessed for corrosion with electrochemical impedance spectroscopy (EIS), open circuit potential (OCP), and potentiodynamic polarization. EIS and circuit modeling results demonstrated higher coating resistance (R c) for mica/PPy (doped) composite coatings as compared to as-received mica pigment containing coating after 30 days of salt spray exposure. Lower current density and more positive corrosion potential values were observed for mica/PPy (doped) composite coatings as compared to mica pigment-based coating in potentiodynamic polarization measurements, indicating improved corrosion protection for cold rolled steel substrate. OCP measurements revealed more positive values for mica/PPy (doped) composite coatings as compared to mica pigment-based coating suggesting superior corrosion protection for mica/PPy (doped) composites.

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Acknowledgments

The authors gratefully acknowledge the support of this research by US Army Research Laboratory under Grant Nos. W911NF-09-2-0014, W911NF-10-2-0082, and W911NF-11-2-0027.

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Authors and Affiliations

  1. Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, 58102, USA

    Niteen Jadhav, Takeshi Matsuda & Victoria Gelling

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  1. Niteen Jadhav
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  2. Takeshi Matsuda
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  3. Victoria Gelling
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Correspondence to Niteen Jadhav.

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Jadhav, N., Matsuda, T. & Gelling, V. Mica/polypyrrole (doped) composite containing coatings for the corrosion protection of cold rolled steel. J Coat Technol Res 15, 363–374 (2018). https://doi.org/10.1007/s11998-017-9974-x

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  • DOI: https://doi.org/10.1007/s11998-017-9974-x

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