Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Hofstetter, J; Martinelli, E; Pogatscher, S; Schmutz, P; Povoden-Karadeniz, E; Weinberg, AM; Uggowitzer, PJ; Löffler, JF.
Influence of trace impurities on the in vitro and in vivo degradation of biodegradable Mg-5Zn-0.3Ca alloys.
Acta Biomater. 2015; 23(2):347-353
Doi: 10.1016/j.actbio.2015.05.004
Web of Science
PubMed
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FullText_MUG
- Co-Autor*innen der Med Uni Graz
- Martinelli Elisabeth
- Weinberg Annelie-Martina
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- Abstract:
- The hydrogen evolution method and animal experiments were deployed to investigate the effect of trace impurity elements on the degradation behavior of high-strength Mg alloys of type ZX50 (Mg-5Zn-0.3Ca). It is shown that trace impurity elements increase the degradation rate, predominantly in the initial period of the tests, and also increase the material's susceptibility to localized corrosion attack. These effects are explained on the basis of the corrosion potential of the intermetallic phases present in the alloys. The Zn-rich phases present in ZX50 are nobler than the Mg matrix, and thus act as cathodic sites. The impurity elements Fe and Mn in the alloy of conventional purity are incorporated in these Zn-rich intermetallic phases and therefore increase their cathodic efficiency. A design rule for circumventing the formation of noble intermetallic particles and thus avoiding galvanically accelerated dissolution of the Mg matrix is proposed. Copyright © 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
- Find related publications in this database (using NLM MeSH Indexing)
- Absorbable Implants -
- Alloys - chemistry
- Animals -
- Body Fluids - chemistry
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- Calcium - chemistry
- Corrosion -
- Electric Conductivity -
- Equipment Contamination -
- Magnesium - chemistry
- Male -
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- Find related publications in this database (Keywords)
- Magnesium
- Mg-Zn-Ca alloys
- Biodegradation
- Intermetallic phases
- Corrosion