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Journal of Materials Engineering and Performance

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24.05.2022 | Technical Article

Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 12/2022

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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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Titel: Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy
Publikationsdatum: 24.05.2022
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 12/2022
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-022-07028-4

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