Degradation Behavior of Micro-Arc Oxidized ZK60 Magnesium Alloy in a Simulated Body Fluid
Abstract
:1. Introduction
2. Materials and Methods
2.1. Coating Preparation
2.2. Immersion Test
2.3. Characterization
3. Results
3.1. Characterization and Properties of the MAO Coating
3.2. Changes in pH Values and Weight Loss Rates of the Samples
3.3. Morphology and Phase Composition of Corroded Samples
3.4. FTIR Spectra of Corrosion Products
3.5. Electrochemical Impedance Spectroscopy
4. Discussion
4.1. Degradation Mechanism of Uncoated ZK60 Alloy
4.2. Degradation Mechanism of the Coated ZK60 Alloy
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Solution | Na+ | K+ | Mg2+ | Ca2+ | Cl− | HCO3− | HPO42− | SO42− |
---|---|---|---|---|---|---|---|---|
SBF | 142.0 | 5.0 | 1.5 | 2.5 | 148.8 | 4.2 | 1.0 | 0.5 |
Blood Plasma | 142.0 | 5.0 | 1.5 | 2.5 | 103.0 | 27.0 | 1.0 | 0.5 |
Reagent | NaCl | NaHCO3 | KCl | K2HPO4·3H2O | MgCl2·6H2O | 1.0 M-HCl | Na2SO4 |
---|---|---|---|---|---|---|---|
Quantity | 8.035 g | 0.355 g | 0.225 g | 0.231 g | 0.311 g | 39 mL | 0.072 g |
Sample | Immersion Time (Days) | Rsoln (Ω·cm²) | Qcp (Ω−1·cm−² sn) | n | Rcp (Ω·cm²) | Qcoat (Ω−1·cm−² sn) | n | Rcoat (Ω·cm²) | Qct (Ω−1·cm−² sn) | n | Rct (Ω·cm²) |
---|---|---|---|---|---|---|---|---|---|---|---|
Uncoated | 5 | 36 | 2.10 × 10−4 | 0.89 | 86.73 | - | - | - | 3.65 × 10−6 | 0.86 | 2056 |
10 | 52 | 1.33 × 10−5 | 0.91 | 122.4 | - | - | - | 3.59 × 10−6 | 0.80 | 3454 | |
20 | 43 | 8.57 × 10−4 | 0.83 | 46.47 | - | - | - | 4.18 × 10−5 | 0.88 | 579.3 | |
30 | 56 | 2.36 × 10−6 | 0.84 | 1206 | - | - | - | 1.50 × 10−7 | 0.95 | 4496 | |
MAO Coated | 5 | 58 | 5.12 × 10−6 | 0.92 | 2124 | 3.88 × 10−7 | 0.85 | 2081 | 4.43 × 10−6 | 0.80 | 2.78 × 104 |
10 | 42 | 2.30 × 10−6 | 0.86 | 8205 | 1.82 × 10−6 | 0.89 | 272.3 | 2.75 × 10−6 | 0.82 | 4.03 × 104 | |
20 | 47 | 3.52 × 10−7 | 0.87 | 1.08 × 104 | 4.18 × 10−4 | 0.90 | 0.02 | 2.35 × 10−7 | 0.89 | 6.73 × 104 | |
30 | 75 | 4.65 × 10−6 | 0.81 | 6587 | 3.25 × 10−4 | 0.82 | 0.53 | 8.69 × 10−6 | 0.81 | 1.39 × 104 |
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Wang, Z.-X.; Chen, G.-Q.; Chen, L.-Y.; Xu, L.; Lu, S. Degradation Behavior of Micro-Arc Oxidized ZK60 Magnesium Alloy in a Simulated Body Fluid. Metals 2018, 8, 724. https://doi.org/10.3390/met8090724
Wang Z-X, Chen G-Q, Chen L-Y, Xu L, Lu S. Degradation Behavior of Micro-Arc Oxidized ZK60 Magnesium Alloy in a Simulated Body Fluid. Metals. 2018; 8(9):724. https://doi.org/10.3390/met8090724
Chicago/Turabian StyleWang, Ze-Xin, Guan-Qun Chen, Liang-Yu Chen, Lei Xu, and Sheng Lu. 2018. "Degradation Behavior of Micro-Arc Oxidized ZK60 Magnesium Alloy in a Simulated Body Fluid" Metals 8, no. 9: 724. https://doi.org/10.3390/met8090724