In-Vitro Degradation of Hollow Silica Reinforced Magnesium Syntactic Foams in Different Simulated Body Fluids for Biomedical Applications
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
- The incorporation of hollow silica nanospheres into Mg led to the progressive enhancement in both 0.2% TYS and UTS whereas the tensile failure strain exhibited declining trend.
- Corrosion resistance of the Mg-SiO2 syntactic foams increased with decreasing presence of chloride, sulphate and dihydrogen phosphate concentrations and increasing carbonate concentration.
- Mg-1.0 vol.% SiO2 syntactic foam displayed the best corrosion response and its corrosion susceptibility pertaining to corrosion rate and polarisation curves in different SBF solutions can be ranked in the following order: ABPS > PBS > HBSS > ASS.
- Mg-SiO2 syntactic foams demonstrated better surface passivation effect which accounts for better corrosion resistance in all the SBF solutions.
- Surface microstructure analysis showed that the syntactic foams samples maintained structural integrity after corrosion and no significant pitting was observed.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Contents (g/L) | ABPS | PBS | ASS | HBSS |
---|---|---|---|---|
NaCl | 8.036 | 8.0 | 1.5 | 8.0 |
NaHCO3 | 0.352 | - | 1.5 | 0.35 |
NaH2PO4 | - | 1.15 | 0.5 | - |
KCl | 0.225 | 0.2 | - | 0.4 |
KSCN | - | - | 0.5 | - |
KH2PO4 | - | 0.2 | - | 0.06 |
Lactic Acid | - | - | 0.9 | - |
Na2HPO4·3H2O | 0.238 | - | - | - |
MgCl2·6H2O | 0.311 | - | - | - |
CaCl2 | 0.293 | - | - | - |
Na2SO4 | 0.0072 | - | - | - |
CaCl2·2H2O | - | - | - | 0.19 |
MgSO4·7H2O | - | - | - | 0.2 |
Na2HPO4·7H2O | - | - | - | 0.09 |
Glucose | - | - | - | 1.0 |
Material | Grain Size (µm) | Microhardness (Hv) | 0.2 TYS (MPa) | UTS (MPa) | Fracture Strain (%) |
---|---|---|---|---|---|
Pure Mg | 27 ± 1 | 59 ± 1 | 103 ± 5 | 148 ± 6 | 7.9 ± 0.5 |
Mg-0.5SiO2 | 23 ± 3 (↓14.8%) | 73 ± 2 (↑23.7%) | 133 ± 3 (↑29.1%) | 181 ± 1 (↑22.3%) | 6.7 ± 0.2 (↓15.2%) |
Mg-1.0SiO2 | 15 ± 3 (↓44.4%) | 83 ± 2 (↑40.7%) | 145 ± 2 (↑40.8%) | 198 ± 7 (↑33.8%) | 5.7 ± 0.2 (↓27.8%) |
Mg-1.5SiO2 | 13 ± 4 (↓51.9%) | 89 ± 1 (↑50.8%) | 152 ± 1 (↑47.5%) | 203 ± 3 (↑37.2%) | 5.2 ± 0.2 (↓34.2%) |
Mg-2SiO2 | 10 ± 2 (↓61%) | 92 ± 1 (↑55.9%) | 167 ± 4 (↑62.1%) | 217 ± 7 (↑46.7%) | 4.7± 0.3 (↓40.5%) |
Cortical bone | - | - | 104–114 | 35–283 | 1.07–2.10 |
Cancellous bone | - | - | - | 1.5–38 | - |
Type of Solution | Material | icorr (µA/cm2) | Ecorr (V vs. SCE) |
---|---|---|---|
ABPS | Pure Mg | 27.77 | −1.53 |
Mg-0.5SiO2 | 24.45 | −1.52 | |
Mg-1.0SiO2 | 35.05 | −1.48 | |
PBS | Pure Mg | 55.46 | −1.54 |
Mg-0.5SiO2 | 52.76 | −1.55 | |
Mg-1.0SiO2 | 29.67 | −1.55 | |
ASS | Pure Mg | 15.83 | −1.72 |
Mg-0.5SiO2 | 13.15 | −1.66 | |
Mg-1.0SiO2 | 11.85 | −1.65 | |
HBSS | Pure Mg | 30.82 | −1.52 |
Mg-0.5SiO2 | 23.61 | −1.48 | |
Mg-1.0SiO2 | 13.71 | −1.50 |
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Manakari, V.; Kannan, S.; Parande, G.; Doddamani, M.; Columbus, S.; K, P.S.; Vincent, S.; Gupta, M. In-Vitro Degradation of Hollow Silica Reinforced Magnesium Syntactic Foams in Different Simulated Body Fluids for Biomedical Applications. Metals 2020, 10, 1583. https://doi.org/10.3390/met10121583
Manakari V, Kannan S, Parande G, Doddamani M, Columbus S, K PS, Vincent S, Gupta M. In-Vitro Degradation of Hollow Silica Reinforced Magnesium Syntactic Foams in Different Simulated Body Fluids for Biomedical Applications. Metals. 2020; 10(12):1583. https://doi.org/10.3390/met10121583
Chicago/Turabian StyleManakari, Vyasaraj, Sathish Kannan, Gururaj Parande, Mrityunjay Doddamani, Soumya Columbus, Priya Sudha K, S. Vincent, and Manoj Gupta. 2020. "In-Vitro Degradation of Hollow Silica Reinforced Magnesium Syntactic Foams in Different Simulated Body Fluids for Biomedical Applications" Metals 10, no. 12: 1583. https://doi.org/10.3390/met10121583