Surface analysis of biodegradable mg-alloys after immersion in simulated body fluid

Author(s)
Darja Steiner Petrovič, Djordje Mandrino, Božidar Šarler, Jelena Horky, Andrea Ojdanic, Michael J. Zehetbauer, Dmytro Orlov
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.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Institute of Metals and Technology Ljubljana, University of Ljubljana, AIT Austrian Institute of Technology, Lund University
Journal
Materials
Volume
13
No. of pages
13
ISSN
1996-1944
DOI
https://doi.org/10.3390/ma13071740
Publication date
04-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
Materials physics
Keywords
ASJC Scopus subject areas
Portal url
https://ucris.univie.ac.at/portal/en/publications/surface-analysis-of-biodegradable-mgalloys-after-immersion-in-simulated-body-fluid(42481ea9-0627-45ad-83d5-eabf1ff9a3e3).html