Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid

Physics and Chemistry of Materials, and Simulation of Materials and Processes, Institute of Metals and Technology, Lepi pot 11, 1000 Ljubljana, Slovenia

Department of Fluid Dynamics and Thermodynamics, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia

Center for Health & Bioresources, Biomedical Systems, AIT Austrian Institute of Technology, Viktor Kaplan Straße 2, 2700 Wiener Neustadt, Austria

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Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria

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Division of Materials Engineering, Department of Mechanical Engineering, Faculty of Engineering (LTH), Lund University, Ole Römers väg 1, 223 63 Lund, Sweden

Author to whom correspondence should be addressed.

Materials 2020, 13(7), 1740; https://doi.org/10.3390/ma13071740

Received: 13 March 2020 / Revised: 3 April 2020 / Accepted: 6 April 2020 / Published: 8 April 2020

(This article belongs to the Special Issue Bioabsorbable and Permanent Materials for Highly Loaded Implants)

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Abstract

Two binary biodegradable Mg-alloys and one ternary biodegradable Mg-alloy (Mg-0.3Ca, Mg-5Zn and Mg-5Zn-0.3Ca, all in wt%) were investigated. Surface-sensitive X-ray photoelectron spectroscopy analyses (XPS) of the alloy surfaces before and after immersion in simulated body fluid (SBF) were performed. The XPS analysis of the samples before the immersion in SBF revealed that the top layer of the alloy might have a non-homogeneous composition relative to the bulk. Degradation during the SBF immersion testing was monitored by measuring the evolution of H₂. It was possible to evaluate the thickness of the sample degradation layers after the SBF immersion based on scanning electron microscopy (SEM) of the tilted sample. The thickness was in the order of 10–100 µm. The typical bio-corrosion products of all of the investigated alloys consisted of Mg, Ca, P and O, which suggests the formation of apatite (calcium phosphate hydroxide), magnesium hydrogen phosphate hydrate and magnesium hydroxide. The bioapplicability of the analyzed alloys with regard to surface composition and degradation kinetics is discussed. View Full-Text

Keywords: biodegradable Mg alloy; corrosion; X-ray photoelectron spectroscopy; phosphate; apatite; degradation layer

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MDPI and ACS Style

Steiner Petrovič, D.; Mandrino, D.; Šarler, B.; Horky, J.; Ojdanic, A.; J. Zehetbauer, M.; Orlov, D. Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid. Materials 2020, 13, 1740. https://doi.org/10.3390/ma13071740

AMA Style

Steiner Petrovič D, Mandrino D, Šarler B, Horky J, Ojdanic A, J. Zehetbauer M, Orlov D. Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid. Materials. 2020; 13(7):1740. https://doi.org/10.3390/ma13071740

Chicago/Turabian Style

Steiner Petrovič, Darja, Djordje Mandrino, Božidar Šarler, Jelena Horky, Andrea Ojdanic, Michael J. Zehetbauer, and Dmytro Orlov. 2020. "Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid" Materials 13, no. 7: 1740. https://doi.org/10.3390/ma13071740

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Surface Analysis of Biodegradable Mg-Alloys after Immersion in Simulated Body Fluid

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