Super-hydrophobic stearic acid layer formed on anodized high purified magnesium for improving corrosion resistance of bioabsorbable implants
| Autor: | T. David Burleigh, Sohrab Khalifeh |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
lcsh:TN1-997
Materials science Magnesium Anodizing Simulated body fluid Metals and Alloys Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Superhydrophobic coating 0104 chemical sciences Corrosion Dielectric spectroscopy chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials 0210 nano-technology Layer (electronics) lcsh:Mining engineering. Metallurgy |
| Zdroj: | Journal of Magnesium and Alloys, Vol 6, Iss 4, Pp 327-336 (2018) |
| ISSN: | 2213-9567 |
| DOI: | 10.1016/j.jma.2018.08.003 |
| Popis: | Magnesium and its alloys are ideal candidates for bioabsorbable implants. However, they can dissolve too rapidly in the human body for most applications. In this research, high purified magnesium (HP-Mg) was coated with stearic acid (SA) to slow the corrosion rate of magnesium in simulated body fluid at 37 ± 1 °C. HP-Mg was anodized (AC and DC voltages) to form an oxide/hydroxide layer, and then it was immersed in a SA solution. The SA coated layer surface, anodized layer, and the thickness of the oxide/hydroxide layer were investigated with Scanning Electron Microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) were used to estimate the corrosion rate of HP-Mg specimens. The results confirm that the hydrophobic coating can decrease the corrosion rate of HP-Mg by more than 1000x. The protectiveness of coated layer for anodized specimens with AC voltage continue for 2 and 3 weeks. For the HP-Mg coated anodized with DC voltage, the coated layer could improve the corrosion resistance for only a few days. Keywords: Magnesium, Biomaterials, Hydrophobic layer, Stearic acid, Simulated body fluid, Electrochemical impedance spectroscopy |
| Databáze: | OpenAIRE |
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