Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Preparation and Laser Surface Alloying Process
2.2. Morphological and Microstructural Analysis
2.3. Microhardness, Residual Stress and Wear Analyses
2.4. Corrosion Analysis
3. Results and Discussion
3.1. Surface Morphology and Microstructural Analysis
3.2. Microhardness, Residual Stress and Wear Analyses
3.3. Corrosion Analysis
3.3.1. Open Circuit Potential
3.3.2. Cyclic Polarization
4. Conclusions
- (1)
- The TiB2/TiC/Al coatings were successfully fabricated with LEDs of 13.3 J/mm2 and 20 J/mm2 and were free of defects with sound bonding to the Al substrate.
- (2)
- The average microhardness of the coating is about 69% higher than the untreated material. LSA of Al alloy with TiB2/TiC/Al does not significantly improve microhardness, due to the addition of Al powder to TiB2-TiC ceramic precursor mixture to improve adhesion properties.
- (3)
- The coating shows exceptional improvement of wear resistance. After the wear test, the LSA coated samples experienced about eight times lower wear volume loss than the substrate.
- (4)
- From the CP results, it is clearly understood that the untreated/substrate Al alloy shows inferior corrosion resistance compared to the laser processed samples, mainly due to the following facts; (i) substrate Al sample revealed no passive behaviour (while the LSA samples exhibited partial passivation); (ii) untreated Al sample has a much higher corrosion current density (8.7 times higher compared to LSA sample processed at 13.3 J/mm2 and 9.4 times higher compared to the LSA sample processed at 20 J/mm2); (iii) higher anodic dissolution (smaller value of Esw − Ecorr) and (iv) more defective surface/higher susceptibility to pitting attack (large value of Ecorr − Eprot) compared to the laser processed TiB2/TiC/Al composite coated samples.
- (5)
- SEM analysis confirmed complete prohibition of crystallographic pitting with LSA samples due to reduced fractional area of liquid-solid interface with chemically more stable surface which prevented the ‘chain-link’ crystallographic corrosion effect, detected with the untreated/substrate material.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Sample Designation | ||
---|---|---|---|
Untreated Al Alloy | Laser Treated/13.3 (J/mm2) | Laser Treated/20 (J/mm2) | |
Ecorr (mVSCE) | −744 ± 17 | −715 ± 12 | −720 ± 11 |
Esw (mVSCE) | −701 ± 11 | −574 ± 8 | −555 ± 6 |
Eprot (mVSCE) | −795 ± 14 | −754 ± 7 | −757 ± 13 |
icorr (μA/cm2) | 29.4 ± 2.86 | 3.38 ± 0.35 | 3.12 ± 0.29 |
PEF (%) | / | 88.50 | 89.39 |
Esw − Ecorr (mV) | 43 ± 6 | 141 ± 4 | 165 ± 5 |
Ecorr − Eprot (mV) | 51 ± 3 | 39 ± 5 | 37 ± 2 |
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Ravnikar, D.; Trdan, U.; Nagode, A.; Šturm, R. Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties. Metals 2020, 10, 411. https://doi.org/10.3390/met10030411
Ravnikar D, Trdan U, Nagode A, Šturm R. Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties. Metals. 2020; 10(3):411. https://doi.org/10.3390/met10030411
Chicago/Turabian StyleRavnikar, Dunja, Uroš Trdan, Aleš Nagode, and Roman Šturm. 2020. "Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties" Metals 10, no. 3: 411. https://doi.org/10.3390/met10030411