Effects of Ni and Co on the Corrosion Resistance of Al-Si-Cu-Zn-Fe Alloys in NaCl Solution
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. SDAS and Secondary Phases under Slow and Fast Solidification
3.2. Potentiodynamic Polarization
3.3. Electrochemical Impedance Spectroscopy
3.4. Immersion Corrosion Results
4. Conclusions
- The microstructures of the alloys were formed by the α-Al dendritic matrix, Si and AlFeSi/AlFeSi(Ni)/AlFeSi(Co) phases. The additions of either Co or Ni were not able to change the SDAS as compared to the non-modified alloy. The fast cooling process resulted in a reduction of SDAS of approximately four times.
- Considering the short elapsed time measurements, the currents associated with the Ecorr, i.e., the corrosion current density (icorr), appear to be highest for the Ni-containing alloy and lowest for the unmodified alloy. While not applying the Taefl extrapolation, the estimated icorr values of the Ni-containing alloy were found to be higher, ranging from 10−6 to 10−5 A/cm2. Moreover, the resistance to anodic polarization was marginally higher in the CC non-modified and Co-containing alloys in comparison to the corresponding DS samples.
- Due to the formation of a thick and dense alumina layer containing Ni in its inner layer, the Ni-containing alloy showed a lower corrosion rate under long exposure conditions (30 days). It is understood from the results of the present investigation that the addition of a small amount of Ni may be beneficial for longer exposure times to the saline electrolyte.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Alloys | Solidification Severity | SDAS (μm) | Rs (Ω cm2) | Rf (kΩ cm2) | Qf (μF s (αf–1)) | αf | Rct (kΩ cm2) | Qdl (μF s (αdl–1)) | αdl | χ2/|Z| |
---|---|---|---|---|---|---|---|---|---|---|
Non-modified | Slow cooling | 21.2 | 31.6 | 45.9 | 4.3 | 0.84 | 100.9 | 14.4 | 0.98 | 0.09 |
Ni-containing | Slow cooling | 21.1 | 31.7 | 10.0 | 13.7 | 0.86 | 67.3 | 56100 | 0.72 | 0.09 |
Co-containing | Slow cooling | 21.1 | 29.8 | 30.4 | 3.3 | 0.88 | 111.3 | 18.4 | 0.84 | 0.04 |
Non-modified | Fast cooling | 4.9 | 31.9 | 31.7 | 4.7 | 0.88 | 69.7 | 33.3 | 0.88 | 0.07 |
Ni-containing | Fast cooling | 5.6 | 30.3 | 7.3 | 8.6 | 0.87 | 9.4 | 219.0 | 0.86 | 0.09 |
Co-containing | Fast cooling | 5.3 | 31.1 | 31.7 | 10.7 | 0.85 | 62.7 | 51.5 | 0.88 | 0.05 |
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Xavier, M.G.C.; Freitas, B.J.M.; Koga, G.Y.; Spinelli, J.E. Effects of Ni and Co on the Corrosion Resistance of Al-Si-Cu-Zn-Fe Alloys in NaCl Solution. Metals 2022, 12, 645. https://doi.org/10.3390/met12040645
Xavier MGC, Freitas BJM, Koga GY, Spinelli JE. Effects of Ni and Co on the Corrosion Resistance of Al-Si-Cu-Zn-Fe Alloys in NaCl Solution. Metals. 2022; 12(4):645. https://doi.org/10.3390/met12040645
Chicago/Turabian StyleXavier, Marcella G. C., Brenda J. M. Freitas, Guilherme Y. Koga, and José E. Spinelli. 2022. "Effects of Ni and Co on the Corrosion Resistance of Al-Si-Cu-Zn-Fe Alloys in NaCl Solution" Metals 12, no. 4: 645. https://doi.org/10.3390/met12040645