Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation
Abstract
:1. Introduction
2. Experiments
2.1. Materials and Methods
2.2. Corrosion Experiments
2.3. Microstructure Characterization
3. Results
3.1. Corrosion Tests
3.2. Potentiodynamic Polarization Tests
3.3. EIS Measurements
3.4. The Second Phase and Grain Structure
4. Discussion
5. Conclusions
- (1)
- Compared with direct artificially aged samples, the pre-strain-aged sample (PA) significantly increased the number density of T1 and θ′ precipitates in the grain interior and inhibited the formation of a PFZ.
- (2)
- PDA and PCA can further enhance the number density of intragranular precipitates and significantly decrease Cu-rich precipitates on grain boundaries (including LAGBs and HAGBs).
- (3)
- Microstructure can make the alloy acquire outstanding comprehensive mechanical properties and IGC resistance; the main corrosion mode is transferred to intragranular pitting corrosion, which reduces corrosion depth. The high number density of precipitates in the grain interior narrows the effective corrosion area in the matrix, which effectively slows down the corrosion diffusion rate.
Author Contributions
Funding
Conflicts of Interest
References
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Cu | Li | Mg | Ag | Zr | Si | Fe | Al |
---|---|---|---|---|---|---|---|
4.01 | 1.13 | 0.37 | 0.32 | 0.12 | 0.04 | 0.05 | Bal |
Heat Treatment | Pre–Strain | Aging Treatment | Treatment Code | YS/MPa | TS/MPa | Elongation |
---|---|---|---|---|---|---|
510 °C/1 h and quenching in water | 0 | 175 °C/24 h | A1 | 521 | 556 | 8.8% |
0 | 155 °C/64 h | A2 | 527 | 560 | 11.3% | |
5% | 155 °C/24 h | PA | 566 | 596 | 11.2% | |
5% | 150 MPa + 155 °C/24 h | PCA | 585 | 604 | 11.8% | |
5% | 120 °C/12 h+ 155 °C/12 h | PDA | 609 | 629 | 11.5% |
A1 | A2 | PA | PCA | PDA | |
---|---|---|---|---|---|
Rs (Ω/cm2) | 3.76 | 6.12 | 7.11 | 8.51 | 10.03 |
Ro (Ω/cm2) | 346 | 466 | 548 | 688 | 776 |
Rc (Ω/cm2) | 2612 | 4938 | 6316 | 7602 | 7964 |
Rp (Ω/cm2) | 2139 | 2705 | 3687 | 4776 | 5077 |
Co (μF/cm2) | 4.33 | 3.45 | 3.38 | 2.96 | 2.92 |
Cc (10−4F/cm2) | 1.73 | 1.53 | 1.40 | 1.32 | 1.29 |
Cp (μF/cm2) | 3.72 | 3.53 | 3.20 | 2.93 | 2.82 |
L (103H/cm2) | 3.20 | 3.63 | 5.83 | 7.15 | 9.49 |
Point | Al | Cu | Fe | Ag | Mg |
---|---|---|---|---|---|
1 | 70.66 | 21.91 | 6.59 | 0.84 | – |
2 | 67.68 | 24.81 | 7.20 | – | 0.31 |
3 | 79.96 | 14.93 | 5.11 | – | – |
4 | 71.20 | 20.34 | 7.73 | 0.74 | – |
5 | 68.98 | 21.35 | 9.67 | – | – |
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Xu, J.; Deng, Y.; Chen, J. Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation. Materials 2020, 13, 2628. https://doi.org/10.3390/ma13112628
Xu J, Deng Y, Chen J. Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation. Materials. 2020; 13(11):2628. https://doi.org/10.3390/ma13112628
Chicago/Turabian StyleXu, Jinjun, Yunlai Deng, and Jiqiang Chen. 2020. "Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation" Materials 13, no. 11: 2628. https://doi.org/10.3390/ma13112628