Study on the Correlation between the Microstructure Characteristics and Corrosion Behaviors of 2A12-T4 Aluminum Alloy under Thermal Strain
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Microscopic Observation
3.1.1. Metallographic Observation
3.1.2. Precipitated Phase Observation
3.1.3. TEM Observation
3.2. Corrosion Behavior Study
3.2.1. Polarization Curve Test
3.2.2. Corrosion Morphology Observation
4. Conclusions
- The precipitated phase was distributed along the direction of tensile strain, and the grain size coarsened from 152 to 260 µm (even more than 280 µm), after experiencing peak temperatures of 300 and 400 °C.
- The risk of corrosion for the samples that experienced thermal strain increased compared to those that did not undergo tensile strain. The samples that experienced a peak temperature of 300 °C presented the best corrosion resistance, as the precipitated phase was evenly distributed in the matrix. When the peak temperature was 400 °C and the strain was 8%, the number and density of the precipitated phase increased due to the dynamic recrystallization, and the worsening corrosion resistance of this sample.
- Dynamic recrystallization occurred in the sample with a peak temperature of 400 °C, and the precipitated phase was mainly distributed along the grain boundaries. This led to the decrease of the corrosion resistance of the grain boundaries, and corrosion developed from pitting corrosion to intergranular corrosion.
Author Contributions
Funding
Conflicts of Interest
References
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Peak Temperature (°C) | Strain (%) | Heating Rate (°C/s) | Cooling Rate (°C/s) | Peak Temperature Residence Time (s) |
---|---|---|---|---|
RT | 0, 4,8 | - | - | - |
200 | 0, 4, 8 | 50 | 5 | 1 |
300 | 0, 4, 8 | 50 | 5 | 1 |
400 | 0, 4, 8 | 50 | 5 | 1 |
Peak Temperature (°C) | Grain Size (µm) |
---|---|
RT—0% | 152.04 ± 1 |
RT—4% | 171.05 ± 1 |
RT—8% | 177.09 ± 1 |
200 °C—0% | 211.84 ± 1 |
200 °C—4% | 233.03 ± 1 |
200 °C—8% | 245.01 ± 1 |
300 °C—0% | 261.04 ± 1 |
300 °C—4% | 269.46 ± 1 |
300 °C—8% | 275.21 ± 1 |
400 °C—0% | 271.55 ± 1 |
400 °C—4% | 279.61 ± 1 |
400 °C—8% | 282.09 ± 1 |
Element | 1 | 2 | 3 | |||
---|---|---|---|---|---|---|
w/% | x/% | w/% | x/% | w/% | x/% | |
Mg | 0.67 | 0.88 | 8.57 | 10.90 | 8.34 | 10.70 |
Al | 60.46 | 71.90 | 56.11 | 71.20 | 63.24 | 75.36 |
Si | 4.23 | 4.83 | 1.16 | 1.28 | - | - |
Fe | 14.41 | 8.28 | - | - | - | - |
Mn | 10.19 | 5.95 | - | - | - | - |
Cu | 10.04 | 8.16 | 34.16 | 16.63 | 28.42 | 13.94 |
Peak Temperature/°C | Potential, Ecorr (E/V) | Current Density, Icorr (mA·cm−2) |
---|---|---|
RT—0% | −0.5740 | 12.27 |
RT—0% | −0.5772 | 12.51 |
RT—0% | −0.5797 | 12.77 |
200 °C—0% | −0.5541 | 12.13 |
200 °C—4% | −0.5871 | 13.02 |
200 °C—8% | −0.5723 | 12.24 |
300 °C—0% | −0.5495 | 10.04 |
300 °C—4% | −0.5689 | 11.61 |
300 °C—8% | −0.5656 | 11.21 |
400 °C—0% | −0.6119 | 13.45 |
400 °C—4% | −0.6248 | 14.46 |
400 °C—8% | −0.6267 | 14.50 |
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Qian, S.; Zhang, T.; Chen, Y.; Li, H.; Xie, J.; He, P. Study on the Correlation between the Microstructure Characteristics and Corrosion Behaviors of 2A12-T4 Aluminum Alloy under Thermal Strain. Metals 2021, 11, 924. https://doi.org/10.3390/met11060924
Qian S, Zhang T, Chen Y, Li H, Xie J, He P. Study on the Correlation between the Microstructure Characteristics and Corrosion Behaviors of 2A12-T4 Aluminum Alloy under Thermal Strain. Metals. 2021; 11(6):924. https://doi.org/10.3390/met11060924
Chicago/Turabian StyleQian, Shuaihao, Timing Zhang, Yuhua Chen, Hongxiang Li, Jilin Xie, and Peng He. 2021. "Study on the Correlation between the Microstructure Characteristics and Corrosion Behaviors of 2A12-T4 Aluminum Alloy under Thermal Strain" Metals 11, no. 6: 924. https://doi.org/10.3390/met11060924