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Evaluation of the corrosion protection of defective polyaniline/epoxy coating by localized electrochemical impedance spectroscopy

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Abstract

Defective epoxy varnish and hydrofluoric acid-doped polyaniline/epoxy (PANI-HF/EP) coatings were coated on the surface of an AZ91D magnesium alloy. The corrosion protection of the defective coatings was evaluated in 0.05 M NaCl by localized electrochemical impedance spectroscopy. Then, the surface of AZ91D magnesium alloy beneath the coating was analyzed by scanning electron microscopyand energy dispersive X-ray spectroscopy. The results indicated that the defective epoxy varnish coating could not protect the magnesium alloy because it only served as an electrolyte barrier. By contrast, the PANI-HF/EP coating served not only as an electrolyte barrier, but also facilitated the formation of a protective layer by redox processes. Therefore, the defective PANI-HF/EP coating could protect magnesium alloy from corrosion.

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Authors and Affiliations

  1. College of Shipbuilding Engineering, Harbin Engineering University, Nantong ST 145, Harbin, 150001, China

    Yingjun Zhang & Ping Li

  2. Corrosion and Protection Laboratory, College of Materials Science & Chemical Engineering, Harbin Engineering University, Nantong ST 145, Harbin, 150001, China

    Yingjun Zhang, Yawei Shao, Guozhe Meng, Tao Zhang & Fuhui Wang

  3. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui RD 62, Shenyang, 110016, China

    Yawei Shao, Guozhe Meng, Tao Zhang & Fuhui Wang

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  1. Yingjun Zhang
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Correspondence to Yawei Shao.

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Zhang, Y., Shao, Y., Meng, G. et al. Evaluation of the corrosion protection of defective polyaniline/epoxy coating by localized electrochemical impedance spectroscopy. J Coat Technol Res 12, 777–785 (2015). https://doi.org/10.1007/s11998-015-9679-y

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  • DOI: https://doi.org/10.1007/s11998-015-9679-y

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