Structural characteristics and corrosion behavior of biodegradable Mg-Zn, Mg-Zn-Gd alloys
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- X-Ray Diffraction MeSH
- Gadolinium chemistry MeSH
- Magnesium chemistry MeSH
- Corrosion MeSH
- Microscopy, Electron, Scanning MeSH
- Osmolar Concentration MeSH
- Potentiometry MeSH
- Alloys chemistry MeSH
- Materials Testing MeSH
- Hardness MeSH
- Absorbable Implants MeSH
- Zinc chemistry MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Gadolinium MeSH
- Magnesium MeSH
- Alloys MeSH
- Zinc MeSH
In this research, binary Mg-Zn (up to 3 wt% Zn) and ternary Mg-Zn-Gd (up to 3 wt% Gd, 3 wt% Zn) alloys were prepared by induction melting in an argon atmosphere. The structures of these alloys were characterized using light and scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and X-ray fluorescence. In addition, Brinell hardness measurements were taken to supplement these studies. Corrosion behavior was evaluated by immersion tests and potentiodynamic measurements in a physiological solution (9 g/l NaCl). Depending on the composition, structures of the as-cast alloys contained α-Mg dendrites, MgZn, Mg5Gd and Mg3Gd2Zn3 phases. Compared to pure Mg, zinc improved the corrosion resistance of binary Mg-Zn. Gadolinium also improved the corrosion resistance in the case of Mg-1Zn-3Gd alloy. The highest corrosion rate was observed for Mg-3Zn-3Gd alloy. Our results improve the understanding of the relationships between the structure and corrosion behavior of our studied alloy systems.
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