Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 723, Issue -, Pages 649-660Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.06.199
Keywords
Mg-Zn alloys; Solidification; Microstructure; Impedance; Polarization
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Funding
- FAEPEX-UNICAMP
- CNPq (Brazilian Research Council)
- CAPES
- FAPESP-Sao Paulo Research Foundation [2013/23396-7, 2014/50502-5]
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Biodegradable implants can be used in order to avoid removal surgery. Mg-Zn alloys are considered interesting alternatives for biomedical applications, however, studies concerning the effects of microstructural features in the as-solidified condition and segregation aspects on the resulting electrochemical behavior are scarce. This investigation is focused on the evaluation of the electrochemical corrosion of an as-solidified Mg-25 wt.% Zn alloy in a 0.15 M NaCl solution at 25 degrees C. EIS plots, potentiodynamic polarization curves and equivalent circuits are used. It is shown that Zn segregation affects both the galvanic couple and the cathode-to-anode area ratio. It was found that finer and homogeneously distributed Mg-rich six-fold branched equiaxed dendritic grains induce lower corrosion current density and higher polarization resistance when compared with equivalent results of coarser ones. (C) 2017 Elsevier B.V. All rights reserved.
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