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Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

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Abstract

Polypyrrole (PPy) doped with either tungstate or vanadate as counter anions was synthesized by chemical oxidative polymerization on the surface of aluminum (Al) flakes. This resulted in the deposition of PPy on the surface of the Al flakes leading to the formation of doped PPy/Al flake composite pigments. These composite pigments were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, conductive-atomic force microscopy, four-point probe conductivity, and X-ray photoelectron spectroscopy. Furthermore, these composites were incorporated in an epoxy-amide binder system in order to formulate a primer for an aluminum 2024-T3 substrate. The coatings were exposed to the Prohesion test conditions and corrosion resistance properties were monitored by electrochemical impedance spectroscopy, DC polarization, galvanic coupling, and scanning electrochemical microscopy measurements. It was found that the doped PPy/Al flake coatings provided sacrificial protection to the underlying aluminum 2024-T3 substrate. Additionally, the release of dopants from PPy backbone resulted in the passivation in the defect areas improving the corrosion protection ability.

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

    Niteen Jadhav & Victoria Gelling

  2. Department of Chemistry, Concordia College, Moorhead, MN, 56562, USA

    Mark B. Jensen

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Jadhav, N., Jensen, M.B. & Gelling, V. Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3. J Coat Technol Res 12, 259–276 (2015). https://doi.org/10.1007/s11998-014-9633-4

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