Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of the Coatings
2.2. Microstructure Characterization
2.3. Electrochemical Performance
2.4. Mechanical Performance
3. Results and Discussion
3.1. X-ray Diffraction (XRD) Analyses
3.2. Microstructural Characterization
3.3. Corrosion Resistance
3.4. Corrosion Wear Resistance
4. Conclusions
- (1)
- CoCrFeNiAlx HEA coatings (x = 0 and 1.0) were fabricated on Ti6Al4V via laser cladding. Primary α(Ti), α(Ti) + Ti2Ni eutectics and TiC dendrites were synthesized. The introduction of Al improved microstructural uniformity by reducing the area fraction of the eutectics and refining TiC dendrites.
- (2)
- The coatings exhibited more outstanding corrosion resistance than the substrate in the 3.5 wt.% NaCl solution due to their lower corrosion potential, corrosion current density, and current density in the stable stage. The introduction of Al accelerated the formation of the oxidation film and reduced its cracking susceptibility, further improving corrosion resistance.
- (3)
- The coatings demonstrated a lower wear rate than the substrate at different wear times in the 3.5 wt.% NaCl solution, transitioning more rapidly into the stable wear stage. The introduction of Al reduced the wear rate in stable wear to a certain extent (2.07 × 10−4 mm3·N−1·m−1 for the coating with Al and 2.68 × 10−4 mm3·N−1·m−1 for the coating without Al).
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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ΔHmix | Ti | Co | Cr | Fe | Ni | Al | C |
---|---|---|---|---|---|---|---|
Ti | - | - | - | - | - | - | - |
Co | −28 | - | - | - | - | - | - |
Cr | −7 | −4 | - | - | - | - | - |
Fe | −17 | −1 | −1 | - | - | - | - |
Ni | −35 | 0 | −7 | −2 | - | - | - |
Al | −30 | −19 | −10 | −11 | −22 | - | - |
C | −109 | −42 | −61 | −50 | −39 | −39 | - |
Coatings | Marked Zones | Elements | ||||||
---|---|---|---|---|---|---|---|---|
Ti | C | Co | Cr | Fe | Ni | Al | ||
CoCrFeNi | A | 62.61 | 2.61 | 4.64 | 9.03 | 5.46 | 3.69 | 11.95 |
B | 60.95 | 1.68 | 5.26 | 6.85 | 5.13 | 13.53 | 6.60 | |
C | 49.93 | 1.44 | 10.51 | 3.92 | 6.87 | 18.46 | 8.87 | |
D | 72.43 | 11.36 | 3.45 | 2.25 | 3.03 | 3.41 | 4.07 | |
CoCrFeNiAl | E | 60.29 | 1.49 | 3.78 | 6.08 | 4.11 | 3.84 | 20.42 |
F | 54.71 | 1.16 | 7.39 | 4.96 | 6.78 | 7.39 | 17.37 | |
G | 76.94 | 11.62 | 1.76 | 1.04 | 1.42 | 2.18 | 5.04 |
Samples | Ecorr/V | Ea-s/V | Ea-s − Ecorr/V | icorr/A∙cm−2 | is/A∙cm−2 |
---|---|---|---|---|---|
Substrate | −0.582 | −0.070 | 0.512 | 6.620 × 10−6 | 1.436 × 10−4 |
x = 0 | −0.524 | −0.299 | 0.225 | 2.249 × 10−7 | 1.021 × 10−6 |
x = 1.0 | −0.393 | −0.231 | 0.161 | 1.260 × 10−7 | 2.506 × 10−7 |
Samples | 2 h | 4 h | 6 h | 8 h | 10 h |
---|---|---|---|---|---|
Substrate | 2.09 × 10−3 | 1.67 × 10−3 | 1.19 × 10−3 | 9.17 × 10−4 | 7.44 × 10−4 |
x = 0 | 7.88 × 10−4 | 4.77 × 10−4 | 3.34 × 10−4 | 3.24 × 10−4 | 2.65 × 10−4 |
x = 1.0 | 7.82 × 10−4 | 4.21 × 10−4 | 2.94 × 10−4 | 2.58 × 10−4 | 2.54 × 10−4 |
Samples | Times (h) | Zones | Elements | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Ti | C | Co | Cr | Fe | Ni | Al | V | O | |||
Substrate | 2 | A | 83.58 | 0.53 | – | – | – | – | 10.52 | 3.56 | 1.81 |
B | 79.50 | 0.91 | – | – | – | – | 11.12 | 4.32 | 4.15 | ||
10 | C | 79.54 | 0.95 | – | – | – | – | 11.12 | 2.94 | 5.45 | |
D | 73.03 | 0.91 | – | – | – | – | 8.25 | 3.48 | 14.33 | ||
x = 1.0 | 2 | F | 57.82 | 1.26 | 4.20 | 3.44 | 3.17 | 4.38 | 3.94 | 2.19 | 19.59 |
E | 65.16 | 0.70 | 4.87 | 4.63 | 5.85 | 5.75 | 8.05 | 3.00 | 1.99 | ||
10 | G | 51.11 | 1.40 | 1.52 | 5.38 | 1.26 | 1.97 | 3.88 | 1.37 | 32.12 | |
H | 58.32 | 0.70 | 5.18 | 8.58 | 6.17 | 4.47 | 10.79 | 3.57 | 2.22 |
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Li, W.; Li, J.; Xu, Y. Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate. Metals 2022, 12, 460. https://doi.org/10.3390/met12030460
Li W, Li J, Xu Y. Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate. Metals. 2022; 12(3):460. https://doi.org/10.3390/met12030460
Chicago/Turabian StyleLi, Wanggen, Jun Li, and Yinsi Xu. 2022. "Investigation into the Corrosion Wear Resistance of CoCrFeNiAlx Laser-Clad Coatings Mixed with the Substrate" Metals 12, no. 3: 460. https://doi.org/10.3390/met12030460