Microstructure and Corrosion Behavior of Composite Coating on Pure Mg Acquired by Sliding Friction Treatment and Micro-Arc Oxidation
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and SFT Processing
2.2. MAO Coating Preparation
2.3. Characterization of Microstructure and Morphology
2.4. Electrochemical Tests
2.5. Immersion Experiment
3. Results
3.1. Microstructure of Fine-Grained Modified Surface
3.2. Microstructure Character of MAO Coating
3.3. Corrosion Behavior
3.3.1. Potentiodynamic Polarization
3.3.2. Electrochemical Impedance Spectroscopy
3.3.3. Immersion Tests
3.3.4. Post-Corrosion Morphologies
4. Discussion
5. Conclusions
- (1)
- A 900 μm thick deformation layer was manufactured on pure Mg surface by SFT technology. The grains existing in deformed layer were reduced to fine-grained level.
- (2)
- MAO coatings were obtained successfully on CG and SFT samples. The surface morphologies and element compositions of both coatings do not exhibit visible difference. The FG-MAO sample has higher thickness and better interface bonding, which can be ascribed to the fast chemical reaction rate during MAO processing induced by FG structure.
- (3)
- For all specimens, the FG-MAO sample shows the lowest corrosion rate, which means that SFT pretreatment is beneficial for improving the quality of MAO coating.
Author Contributions
Funding
Conflicts of Interest
References
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Sample | Binding Energy (eV) | |||
---|---|---|---|---|
Mg | F | O | Si | |
CG-MAO | 1304.07 | 685.17 | 531.67 | 102.07 |
FG-MAO | 1304.37 | 685.07 | 531.87 | 102.27 |
Sample | Ecorr (V vs. SCE) | icorr (μA·cm−2) | βc (mV·dec−1) | βa (mV·dec−1) |
---|---|---|---|---|
CG | −1.772 ± 0.008 | 31.6 ± 6.6 | 53 ± 8 | 58 ± 12 |
SFT | −1.916 ± 0.012 | 15.3 ± 3.2 | 49 ± 12 | 69 ± 16 |
CG-MAO | −1.352 ± 0.004 | 2.75 ± 0.37 | 63 ± 10 | 75 ± 9 |
FG-MAO | −1.255 ± 0.002 | 0.35 ± 0.06 | 52 ± 7 | 99 ± 17 |
Sample | CG | SFT | CG-MAO | FG-MAO |
---|---|---|---|---|
CR (mm·year−1) | 0.71 ± 0.14 | 0.34 ± 0.072 | 0.062 ± 0.007 | 0.008 ± 0.001 |
Sample | Rs (Ω·cm2) | Rm (Ω·cm2) | CPEm | Rp (Ω·cm2) | CPEp | Rct (Ω·cm2) | Cdl (μF) | ||
---|---|---|---|---|---|---|---|---|---|
Q (Ω−1·cm−2·sn) | n | Q (Ω−1·cm−2·sn) | n | ||||||
CG | 2.98 ± 0.58 | — | — | — | 131 ± 24 | (3.04 ± 0.38) × 10−5 | 0.82 ± 0.11 | 30.78 ± 4.22 | 139 ± 27 |
SFT | 3.67 ± 0.86 | — | — | — | 315 ± 67 | (2.48 ± 0.24) × 10−5 | 0.85 ± 0.14 | 93.52 ± 8.35 | 401 ± 36 |
CG-MAO | 6.06 ± 1.23 | 1147 ± 102 | (1.63 ± 0.15) × 10−7 | 0.76 ± 0.10 | 1108 ± 122 | (1.43 ± 0.19) × 10−7 | 0.95 ± 0.18 | 543.91 ± 42.88 | 650 ± 43 |
FG-MAO | 3.05 ± 0.81 | 1906 ± 135 | (6.17 ± 0.72) × 10−8 | 0.84 ± 0.18 | 1212 ± 109 | (5.23 ± 0.44) × 10−8 | 0.98 ± 0.10 | 736.95 ± 58.63 | 1300 ± 118 |
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Cao, H.; Huo, W.; Ma, S.; Zhang, Y.; Zhou, L. Microstructure and Corrosion Behavior of Composite Coating on Pure Mg Acquired by Sliding Friction Treatment and Micro-Arc Oxidation. Materials 2018, 11, 1232. https://doi.org/10.3390/ma11071232
Cao H, Huo W, Ma S, Zhang Y, Zhou L. Microstructure and Corrosion Behavior of Composite Coating on Pure Mg Acquired by Sliding Friction Treatment and Micro-Arc Oxidation. Materials. 2018; 11(7):1232. https://doi.org/10.3390/ma11071232
Chicago/Turabian StyleCao, Huihui, Wangtu Huo, Shufang Ma, Yusheng Zhang, and Lian Zhou. 2018. "Microstructure and Corrosion Behavior of Composite Coating on Pure Mg Acquired by Sliding Friction Treatment and Micro-Arc Oxidation" Materials 11, no. 7: 1232. https://doi.org/10.3390/ma11071232