Properties of Microplasma Coating on AZ91 Magnesium Alloy Prepared from Electrolyte with and without the Borax Addition
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of Samples, Electrolytes, and PEO Coatings
2.2. Characterization of the Substrates and PEO Coatings
3. Results and Discussion
3.1. The Coatings Morphology and Structure
3.2. Wear Resistance of the Coatings
3.3. The Corrosion Resistance of the Coatings
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Symbol | Chemical Composition [wt%] | ||||||||
---|---|---|---|---|---|---|---|---|---|
Al | Zn | Mn | Si | Fe | Cu | Ni | Ti | Mg | |
AZ91 | 8.50 | 0.75 | 0.13 | 0.02 | 0.02 | 0.01 | 0.002 | 0.025 | Balance |
EN 1753: 2019 standard | 8.50 ÷ 9.50 | 0.30 ÷ 1.00 | <0.00 ÷ 0.15 | <0.30 | <0.03 | <0.025 | <0.001 | – | Balance |
Base PEO Coating | Modified PEO Coating | ||
---|---|---|---|
Electrolyte composition | NaOH (g·cm−3) | 4 | 4 |
Na2SiO3·5H2O (g·cm−3) | 15 | 15 | |
NaF (g·cm−3) | - | 2 | |
Na2B4O7 (g·cm−3) | - | 2 | |
PEO process conditions | Time (s) | 360–420 | |
Electrolysis voltage (V) | 405 | ||
Average anodic current density (A·dm−2) | 5 | ||
Controlled current frequency (Hz) | 1000 | ||
Current rise rate (A·μs−1) | 200 | ||
Level of current filling pulse (%) | 30 |
Type of Sample | Designation of Samples |
---|---|
AZ91 magnesium alloy—reference sample | AZ91 |
AZ91 magnesium alloy covered without the borax addition PEO layer (see Table 2) | Base PEO coating |
AZ91 magnesium alloy covered with the borax addition PEO layer (see Table 2) | Modified PEO coating |
Parameter | Value and Unit |
---|---|
Ball material | WC [−] |
Ball diameter | 6 [mm] |
Load | 2 [N] |
The radius of the sliding circle | 6 [mm] |
Sliding speed | 0.1 [m/s] |
Sliding distance | 500 [m] |
Duration of the test | 5 000 [s] |
Number of cycles | 13 263 [−] |
Point No. from Figure 4. | Base PEO Coating | Modified PEO Coating | ||||||
---|---|---|---|---|---|---|---|---|
O | Mg | Al | Si | O | Mg | Al | Si | |
1 | 57.2 | 31.3 | 3.1 | 8.4 | 50.8 | 34.6 | 2.3 | 12.3 |
2 | 48.1 | 43.7 | 3.7 | 4.5 | 37.2 | 50.9 | 6.2 | 5.7 |
3 | - | 91.5 | 8.5 | - | - | 91.4 | 8.6 | - |
4 | - | 90.0 | 10.0 | - | - | 93.0 | 7.0 | - |
Polarization Parameter | AZ91 | Base PEO Coating | Modified PEO Coating |
---|---|---|---|
Ecorr (V) | −1.404 | −1.467 | −1.494 |
icorr (A cm−2) | 2.0 × 10−5 | 1.2 × 10−7 | 1.7 × 10−7 |
Rp (Ω·cm2) | 1297 | 3.18 × 105 | 2.58 × 105 |
corrosion rate (mm/year) | 1.396 | 0.0692 | 0.0060 |
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Bisztyga-Szklarz, M.; Rząd, E.; Boroń, Ł.; Klimczyk, P.; Polczyk, T.; Łętocha, A.; Rajska, M.; Hebda, M.; Długosz, P. Properties of Microplasma Coating on AZ91 Magnesium Alloy Prepared from Electrolyte with and without the Borax Addition. Materials 2022, 15, 1354. https://doi.org/10.3390/ma15041354
Bisztyga-Szklarz M, Rząd E, Boroń Ł, Klimczyk P, Polczyk T, Łętocha A, Rajska M, Hebda M, Długosz P. Properties of Microplasma Coating on AZ91 Magnesium Alloy Prepared from Electrolyte with and without the Borax Addition. Materials. 2022; 15(4):1354. https://doi.org/10.3390/ma15041354
Chicago/Turabian StyleBisztyga-Szklarz, Magdalena, Ewa Rząd, Łukasz Boroń, Piotr Klimczyk, Tomasz Polczyk, Aneta Łętocha, Maria Rajska, Marek Hebda, and Piotr Długosz. 2022. "Properties of Microplasma Coating on AZ91 Magnesium Alloy Prepared from Electrolyte with and without the Borax Addition" Materials 15, no. 4: 1354. https://doi.org/10.3390/ma15041354