Microstructure and Corrosion Characterization of a MgO/Hydroxyapatite Bilayer Coating by Plasma Electrolytic Oxidation Coupled with Flame Spraying on a Mg Alloy

Thermally sprayed hydroxyapatite coatings are one of the main strategies to improve the bioactivation of metal implants. However, the naturally low corrosion resistance of these coatings is the main challenge for their use. In this study, plasma electrolytic oxidation (PEO) was used to create an int...

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Published in:ACS omega 2020-09, Vol.5 (38), p.24186-24194
Main Authors: Mardali, Marzieh, Salimijazi, Hamidreza, Karimzadeh, Fathallah, Blawert, Carsten, Luthringer-Feyerabend, Bérengère J. C, Fazel, Mohammad, Safarbali, Babak
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cited_by cdi_FETCH-LOGICAL-a476t-35a60465fe77d8c3d669ffabf89463879cf2c7068fa1657af8800e983ffd25f53
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container_end_page 24194
container_issue 38
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container_title ACS omega
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creator Mardali, Marzieh
Salimijazi, Hamidreza
Karimzadeh, Fathallah
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Fazel, Mohammad
Safarbali, Babak
description Thermally sprayed hydroxyapatite coatings are one of the main strategies to improve the bioactivation of metal implants. However, the naturally low corrosion resistance of these coatings is the main challenge for their use. In this study, plasma electrolytic oxidation (PEO) was used to create an intermediate layer. The anodization process was used for comparison. According to the polarization curves, the PEO layer was more effective than the anodized layer in reducing the corrosion current density (I corr of 0.05 × 10–9 A/cm2 vs I corr of 0.05 A/cm2). The results of electrochemical impedance spectroscopy showed higher resistance of the sample with a PEO interlayer than that of the sample with an anodized interlayer. The results of the hydrogen evolution test revealed that the PEO layer as a middle layer served as the main barrier for reducing the magnesium corrosion rate, especially during the initial immersion time.
doi_str_mv 10.1021/acsomega.0c01574
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title Microstructure and Corrosion Characterization of a MgO/Hydroxyapatite Bilayer Coating by Plasma Electrolytic Oxidation Coupled with Flame Spraying on a Mg Alloy
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