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Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy

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Abstract

In this work, a PEO coating on AZ31 magnesium alloy was post-treated in three different solutions containing NaF, Na2CO3 and NaAlO2, with the aim of sealing the anodic film and consequently increasing the corrosion resistance of the material. The morphology and chemical composition of the resulting coatings were analyzed by scanning electron microscopy, x-ray diffraction and Fourier transform infrared spectroscopy. Samples were tested in a salt spray chamber, and corrosion rate was evaluated by the hydrogen evolution technique. It was found that a pore sealing treatment of 90 minutes in the solution containing a mixture of NaF and NaAlO2 resulted in an increase in the corrosion resistance of the PEO coating.

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Acknowledgments

The authors are grateful to Universidad de Antioquia, Universidad Pontificia Bolivariana, Universidad de Medellín, Servicio Nacional de Aprendizaje-SENA and MINCIENCIAS for financial assistance (Project FP44842-023-2017).

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Authors and Affiliations

  1. Facultad de Ingeniería, Centro de Investigación, Innovación y Desarrollo de Materiales CIDEMAT, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia

    L. Toro, E. Correa & F. Echeverría

  2. Facultad de Diseño Industrial, Grupo de Investigación de Estudios en Diseño - GED, Universidad Pontificia Bolivariana UPB, Circular 1ª. No 70-01, Medellín, Colombia

    A. A Zuleta

  3. Facultad de Ingenierías, Grupo de Investigación Materiales con Impacto–MAT&MPAC, Universidad de Medellín UdeM, Carrera 87 No 30–65, Medellín, Colombia

    E. Correa

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Toro, L., Zuleta, A.A., Correa, E. et al. Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy. J. of Materi Eng and Perform 31, 9768–9776 (2022). https://doi.org/10.1007/s11665-022-07028-4

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