The effects of Zn segregation and microstructure length scale on the corrosion behavior of a directionally solidified Mg-25 wt.%Zn alloy
| Autor: | Emmanuelle S. Freitas, Amauri Garcia, Noé Cheung, Wislei R. Osório, Nathália C. Verissimo |
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| Rok vydání: | 2017 |
| Předmět: |
Length scale
Equiaxed crystals Materials science 020209 energy Mechanical Engineering Metallurgy Alloy Metals and Alloys 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Electrochemistry Microstructure Mechanics of Materials 0202 electrical engineering electronic engineering information engineering Materials Chemistry engineering Galvanic cell Equivalent circuit 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | Journal of Alloys and Compounds. 723:649-660 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2017.06.199 |
| Popis: | 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 °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. |
| Databáze: | OpenAIRE |
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