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Article

Degradation Analysis of Thin Mg-xAg Wires Using X-ray Near-Field Holotomography

1
Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max–Planck–Str. 1, 21502 Geesthacht, Germany
2
Institute of Materials Physics, Helmholtz-Zentrum Hereon, Max–Planck–Str. 1, 21502 Geesthacht, Germany
3
CXNS—Center for X-ray and Nano Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
4
Helmholtz Imaging Platform, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
*
Authors to whom correspondence should be addressed.
These authors contributed equally as main authors to this work.
Academic Editors: Ilya Okulov and Eli Aghion
Metals 2021, 11(9), 1422; https://doi.org/10.3390/met11091422
Received: 21 July 2021 / Revised: 21 August 2021 / Accepted: 2 September 2021 / Published: 8 September 2021
(This article belongs to the Special Issue Development and Application of Biodegradable Metals)
Magnesium–silver alloys are of high interest for the use as temporary bone implants due to their antibacterial properties in addition to biocompatibility and biodegradability. Thin wires in particular can be used for scaffolding, but the determination of their degradation rate and homogeneity using traditional methods is difficult. Therefore, we have employed 3D imaging using X-ray near-field holotomography with sub-micrometer resolution to study the degradation of thin (250 μm diameter) Mg-2Ag and Mg-6Ag wires. The wires were studied in two states, recrystallized and solution annealed to assess the influence of Ag content and precipitates on the degradation. Imaging was employed after degradation in Dulbecco’s modified Eagle’s medium and 10% fetal bovine serum after 1 to 7 days. At 3 days of immersion the degradation rates of both alloys in both states were similar, but at 7 days higher silver content and solution annealing lead to decreased degradation rates. The opposite was observed for the pitting factor. Overall, the standard deviation of the determined parameters was high, owing to the relatively small field of view during imaging and high degradation inhomogeneity of the samples. Nevertheless, Mg-6Ag in the solution annealed state emerges as a potential material for thin wire manufacturing for implants. View Full-Text
Keywords: X-ray computed tomography; magnesium-silver alloy; wire; degradation; near-field holotomography X-ray computed tomography; magnesium-silver alloy; wire; degradation; near-field holotomography
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MDPI and ACS Style

Meyer, S.; Wolf, A.; Sanders, D.; Iskhakova, K.; Ćwieka, H.; Bruns, S.; Flenner, S.; Greving, I.; Hagemann, J.; Willumeit-Römer, R.; Wiese, B.; Zeller-Plumhoff, B. Degradation Analysis of Thin Mg-xAg Wires Using X-ray Near-Field Holotomography. Metals 2021, 11, 1422. https://doi.org/10.3390/met11091422

AMA Style

Meyer S, Wolf A, Sanders D, Iskhakova K, Ćwieka H, Bruns S, Flenner S, Greving I, Hagemann J, Willumeit-Römer R, Wiese B, Zeller-Plumhoff B. Degradation Analysis of Thin Mg-xAg Wires Using X-ray Near-Field Holotomography. Metals. 2021; 11(9):1422. https://doi.org/10.3390/met11091422

Chicago/Turabian Style

Meyer, Sebastian, Andreas Wolf, Daniela Sanders, Kamila Iskhakova, Hanna Ćwieka, Stefan Bruns, Silja Flenner, Imke Greving, Johannes Hagemann, Regine Willumeit-Römer, Björn Wiese, and Berit Zeller-Plumhoff. 2021. "Degradation Analysis of Thin Mg-xAg Wires Using X-ray Near-Field Holotomography" Metals 11, no. 9: 1422. https://doi.org/10.3390/met11091422

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