title: Structural characteristics and corrosion behavior of biodegradable Mg-Zn, Mg-Zn-Gd alloys.
abstract: 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.
authors.affiliation: Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28, Prague 6, Czech Republic. kubasekj@vscht.cz
authors.forename: J
authors.initials: J
authors.lastname: Kubásek
authors.forename: D
authors.initials: D
authors.lastname: Vojtěch
mesh_terms: D020341:Absorbable Implants; D000497:Alloys / Q000737:chemistry*; D003343:Corrosion; D005682:Gadolinium / Q000737:chemistry*; D006244:Hardness; D008274:Magnesium / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009994:Osmolar Concentration; D011199:Potentiometry; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D000497:Alloys; D005682:Gadolinium; D008274:Magnesium; D015032:Zinc