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Novel conducting polymer based composite coatings for corrosion protection of zinc

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Bai,  Xiaoxia
School of Materials Science and Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, China;
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, CAS, No. 29, East Road, Zhongguancun, Haidian District, Beijing, China;
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Tran,  The Hai
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Vimalanandan,  Ashokanand
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Rohwerder,  Michael
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Bai, X., Tran, T. H., Yu, D., Vimalanandan, A., Hu, X., & Rohwerder, M. (2015). Novel conducting polymer based composite coatings for corrosion protection of zinc. Corrosion Science, 95, 110-116. doi:10.1016/j.corsci.2015.03.003.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-9DEF-F
Abstract
The application of conducting polymers on zinc tends to result in an electronically highly insulating interface-leading even-to-Fermi-level misalignment at the polymer/metal interface. This makes-the conducting polymers electrochemically inactive. To prevent this Fermi-level misalignment, carbon black was introduced as conductive spacer between the conducting polymer and the zinc into composite coatings of poly (3,4-ethylenedioxythiophene) (PEDOT) nanoparticles and a polyvinyl butyral (PVB) binder. It was found that the carbon black not only enabled electronic contact between zinc and the PEDOT, but also increased the amount of electrochemical available PEDOT in the coating, by supplying the necessary conductive pathways. (C) 2015 Elsevier Ltd. All rights reserved.