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Phosphorylated PVA coatings for corrosion protection of Mg AZ31 alloy

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Abstract

In this paper, the influence of different amounts of phosphoric acid on the protective properties of phosphorylated PVA (PPVA) coatings on a Mg AZ31 alloy is investigated. PPVA coatings and free-standing films were prepared by dip-coating and casting, respectively, and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and swelling assays. The anticorrosion properties of the coatings were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization, both in 3.5 wt% NaCl solution. The results show that |Z| values increase with the amount of H3PO4, reaching values on the order of 105 Ω cm2 for the coating with the highest amount of H3PO4 (0.100 PPVA). Additionally, this sample shows the lowest swelling degree (around 80%). Polarization tests demonstrate that all coatings significantly decrease jcorr (from 4.8 μA cm−2 to values around 0.3 μA cm−2) by means of a cathodic inhibition. These results make of PPVA coatings interesting water-based alternatives to polysaccharide coatings.

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Acknowledgments

The authors thank the UNIEDU/FUMDES/Pós-graduação fellowship and the Brazilian government agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for funding the research.

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  1. Materials Engineering Department, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Carlos Henrique Michelin Beraldo

  2. Chemistry Department, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Almir Spinelli & Thiago Ferreira da Conceição

  3. Helmholtz-Zentrum Hereon GmbH, Institute of Surface Science, 21502, Geesthacht, Germany

    Nico Scharnagl

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Beraldo, C.H.M., Spinelli, A., Scharnagl, N. et al. Phosphorylated PVA coatings for corrosion protection of Mg AZ31 alloy. J Coat Technol Res 21, 243–253 (2024). https://doi.org/10.1007/s11998-023-00813-3

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