Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy

L. Toro; A. A. Zuleta; E. Correa; F. Echeverría

doi:10.1007/s11665-022-07028-4

Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy

L. Toro, A. A. Zuleta, E. Correa, F. Echeverría

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Journal	Journal of Materials Engineering and Performance
DOIs	https://doi.org/10.1007/s11665-022-07028-4
State	Accepted/In press - 2022

Bibliographical note

Funding Information:
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).

Publisher Copyright:
© 2022, ASM International.

Keywords

anodic coatings
corrosion resistance
magnesium alloys
plasma electrolytic oxidation
sealing treatment

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10.1007/s11665-022-07028-4

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title = "Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy",

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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doi = "10.1007/s11665-022-07028-4",

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T1 - Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy

AU - Toro, L.

AU - Zuleta, A. A.

AU - Correa, E.

AU - Echeverría, F.

PY - 2022

Y1 - 2022

N2 - 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.

AB - 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.

KW - anodic coatings

KW - corrosion resistance

KW - magnesium alloys

KW - plasma electrolytic oxidation

KW - sealing treatment

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DO - 10.1007/s11665-022-07028-4

M3 - Artículo

AN - SCOPUS:85130704291

JO - Journal of Materials Engineering and Performance

JF - Journal of Materials Engineering and Performance

SN - 1059-9495

ER -

Hydrothermal Sealing of Plasma Electrolytic Oxidation Coatings Developed on AZ31 Alloy

Abstract

Bibliographical note

Keywords

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