Effect of Carbohydrates on the Formation Process and Performance of Micro-Arc Oxidation Coatings on AZ31B Magnesium Alloy
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. Preparation of MAO Coatings
2.3. Characterization of MAO Coatings
2.4. Corrosion Resistance Test of MAO Coatings
3. Results and Discussions
3.1. MAO Process
3.2. Properties of MAO Coatings
3.3. Morphological Characteristics
3.4. Phase Analysis
3.5. Electrochemical Properties of MAO Coatings
3.5.1. Polarization Curves
3.5.2. Electrochemical Impedance Spectroscopy
4. Conclusions
- (1)
- Spark discharge was suppressed with the additions of lactose, starch, and dextrin into the alkaline electrolyte in the MAO process. Also, the thickness and corrosion resistance of the MAO coatings with a smooth surface structure were improved.
- (2)
- The additives of lactose, starch, and dextrin affected the MAO process but did not participate in the film-forming reaction. The XRD results show that the MAO coatings were mainly composed of MgO, MgSiO3, and Mg2SiO4.
- (3)
- Through the polarization curves and EIS test, it was found that the addition of lactose, starch, and dextrin to the alkaline electrolyte significantly improved the corrosion resistance of the MAO coatings. When the concentration of lactose, starch, and dextrin additives was 10 g/L, the MAO coatings had the best corrosion resistance. In this framework, the corrosion potentials of the MAO coatings were −1.28 V, −1.27 V, and −1.31 V, respectively; the corrosion current densities were 2.21 × 10−8 A/cm2, 1.90 × 10−8 A/cm2, and 3.22 × 10−8 A/cm2; and the Rct values were 1.62 × 107 ohm·cm−2, 1.68 × 107 ohm·cm−2, and 1.47 × 107 ohm·cm−2, respectively.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Addition/10 g/L | Element (wt%) | ||||
---|---|---|---|---|---|
O | Na | Mg | Si | Al | |
None | 55.7 | 6.2 | 28.3 | 9.1 | 0.7 |
Lactose | 51.6 | 3.1 | 32.6 | 9.2 | 1.0 |
Starch | 53.8 | 3.1 | 32.7 | 9.6 | 0.9 |
Dextrin | 54.3 | 3.5 | 32.2 | 9.1 | 0.9 |
Addition/10 g·L−1 | Ecorr/V | jcorr/A·cm−2 |
---|---|---|
None | −1.447 ± 0.002 | 1.34 × 10−7 ± 0.24 × 10−7 |
Lactose | −1.284 ± 0.004 | 2.78 × 10−8 ± 0.18 × 10−8 |
Starch | −1.273 ± 0.003 | 2.43 × 10−8 ± 0.16 × 10−8 |
Dextrin | −1.307 ± 0.005 | 6.08 × 10−8 ± 0.28 × 10−8 |
Addition | c/g·L−1 | Rs/ohm·cm−2 | C/μF·cm−2 | Rp/ohm·cm−2 | CPE1/ (μF·cm−2)1/n | n1 | CPE2/ (μF·cm−2)1/n | n2 | Rct/107 ohm·cm−2 |
---|---|---|---|---|---|---|---|---|---|
None | 0 | 91.57 | -- | 2485 | 0.55 × 10−2 | 0.91 | 0.33 × 10−2 | 0.93 | 0.13 |
Lactose | 5 | 117.9 | 1.32 × 10−2 | 8391 | -- | -- | 8.92 × 10−2 | 0.67 | 0.83 |
10 | 153.1 | 0.82 × 10−2 | 4432 | -- | -- | 7.96 × 10−2 | 0.71 | 1.62 | |
15 | 168.5 | 4.76 × 10−2 | 10,680 | -- | -- | 7.12 × 10−2 | 0.72 | 1.21 | |
Starch | 5 | 128.4 | 5.44 × 10−2 | 4827 | -- | -- | 9.54 × 10−2 | 0.60 | 0.71 |
10 | 142.7 | 1.02 × 10−2 | 4262 | -- | -- | 0.12 × 10−2 | 0.68 | 1.68 | |
15 | 122.2 | 3.94 × 10−2 | 5586 | -- | -- | 0.10 × 10−2 | 0.72 | 1.33 | |
Dextrin | 5 | 98.1 | 5.63 × 10−2 | 7752 | -- | -- | 9.37 × 10−2 | 0.70 | 1.09 |
10 | 139.3 | 1.13 × 10−2 | 6831 | -- | -- | 1.23 × 10−2 | 0.66 | 1.47 | |
15 | 103.2 | 5.19 × 10−2 | 5101 | -- | -- | 9.34 × 10−2 | 0.70 | 1.18 |
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Du, Y.; Hu, M.; Tu, X.; Miao, C.; Zhang, Y.; Li, J. Effect of Carbohydrates on the Formation Process and Performance of Micro-Arc Oxidation Coatings on AZ31B Magnesium Alloy. Technologies 2023, 11, 139. https://doi.org/10.3390/technologies11050139
Du Y, Hu M, Tu X, Miao C, Zhang Y, Li J. Effect of Carbohydrates on the Formation Process and Performance of Micro-Arc Oxidation Coatings on AZ31B Magnesium Alloy. Technologies. 2023; 11(5):139. https://doi.org/10.3390/technologies11050139
Chicago/Turabian StyleDu, Yingxiu, Mingyue Hu, Xiaohua Tu, Chengping Miao, Yang Zhang, and Jiayou Li. 2023. "Effect of Carbohydrates on the Formation Process and Performance of Micro-Arc Oxidation Coatings on AZ31B Magnesium Alloy" Technologies 11, no. 5: 139. https://doi.org/10.3390/technologies11050139