Electrochemical Behavior of Biodegradable FeMnSi–MgCa Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Surface Characterization
3.2. Surface Chemical Characterization
3.3. Surface Electrochemical Characterization
4. Conclusions
- We demonstrated that micro-alloying the FeMnSi alloy with Ca and Mg elements resulted in obtaining an α-phase microstructure in a melted state with finely distributed Ca and Mg elements.
- By adding small quantities of Ca and Mg, the corrosion rate in SBF can be increased due to the formation of fine precipitates and also by changing the mechanical behavior and initial corrosion mechanism of the alloy. Further work in in vivo tests of this new material is proposed to evaluate the behavior of the material in real conditions in short, medium, or long periods.
- When introducing and maintaining the FeMnSi–MgCa alloy in artificial blood plasma (SBF), the corrosion process starts from the initial moment and continues throughout the immersion period. Initially, corrosion products (possibly iron and manganese oxides) are adsorbed as microparticles on the surface of the alloy; over time, a compact layer is formed on the surface, which allows the transfer of diffusion loads. After a longer period in the solution, the compact layer deteriorates (becomes porous or cracked) and continues the corrosion in the form of crevasses.
Author Contributions
Funding
Conflicts of Interest
References
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Chemical Composition (Ions) (mmol/dm3) | Na+ | K+ | Mg2+ | Ca2+ | Cl− | HCO3− | HPO42− | SO42− |
---|---|---|---|---|---|---|---|---|
Simulated body fluid | 142 | 5 | 1.5 | 2.5 | 147.8 | 4.2 | 1 | 0.5 |
Human blood plasma | 142 | 5 | 1.5 | 2.5 | 103 | 27 | 1 | 0.5 |
Sample/Dimension | Length (mm) | Width (mm) | Thickness (mm) | Total Area (mm2) | Initial Weight (g) | Weight after Immersion (g) | Weight after Immersion + Sonication (g) |
---|---|---|---|---|---|---|---|
7 days | 10.1 | 6.94 | 4.54 | 294.91 | 2.397 | 2.380 | 2.3706 |
14 days | 10.25 | 6.98 | 4.54 | 299.54 | 2.426 | 2.401 | 2.372 |
30 days | 10.03 | 6.83 | 4.54 | 290.1 | 2.310 | 2.279 | 2.265 |
Parameter | 0 Days | 7 Days | 14 Days | 30 Days |
---|---|---|---|---|
OCP (mV) | −753 | −713 | −679 | −751 |
Ecor (Ej=0) (mV) | −682 | −681 | −727 | −677.9 |
Rp (ohm · cm2) | 49.01 | 383.31 | 17.71 | 19.14 |
bamV | 168 | 82 | 158 | 164.5 |
bcmV | −1340 | −280 | −451 | −1116.3 |
jcorr (mA/cm2) | 0.695 | 0.0571 | 2.022 | 1.7740 |
vcor (mm/year) | 8.126 | 0.668 | 23.640 | 20.74 |
Rp = (dE/dj)E (Ω · cm2) | 47.98 | 340.49 | 17.87 | 18.60 |
Parameters | Rs (ohm · cm2) | Q1 (S · sn/cm2) | n1 | R1 (kohm · cm2) | Q2, S · sn/cm2 | n2 | L (Henry · cm2) | W (S · s½ · cm2) | R2 (kohm · cm2) | χ2 |
---|---|---|---|---|---|---|---|---|---|---|
0 Days | 444.6 | 12.1210−6 | 0.694 | 3.863 | - | - | 108.2 | - | 1.096 | 5.70 10−4 |
7 Days | 712.8 | 30.1 10−6 | 0.721 | 3.409 | - | - | - | 2.21 10−4 | - | 1.86 10−4 |
14 Days | 587.4 | 30.6 10−6 | 0.730 | 2.651 | 2.21 10−4 | 0.799 | - | - | 1.695 | 1.86 10−4 |
30 Days | 447.8 | 7.81 10−5 | 0.435 | 1.007 103 | 2.24 10−5 | 0.797 | - | - | 3.239 × 103 | - |
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Cimpoeşu, N.; Săndulache, F.; Istrate, B.; Cimpoeşu, R.; Zegan, G. Electrochemical Behavior of Biodegradable FeMnSi–MgCa Alloy. Metals 2018, 8, 541. https://doi.org/10.3390/met8070541
Cimpoeşu N, Săndulache F, Istrate B, Cimpoeşu R, Zegan G. Electrochemical Behavior of Biodegradable FeMnSi–MgCa Alloy. Metals. 2018; 8(7):541. https://doi.org/10.3390/met8070541
Chicago/Turabian StyleCimpoeşu, Nicanor, Florin Săndulache, Bogdan Istrate, Ramona Cimpoeşu, and Georgeta Zegan. 2018. "Electrochemical Behavior of Biodegradable FeMnSi–MgCa Alloy" Metals 8, no. 7: 541. https://doi.org/10.3390/met8070541