Investigation of the Electrochemical Breakdown Response in Sensitised AA5083 Aluminium Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Microstructural Analysis—Degree of Sensitisation
3.2. Electrochemical Potentiodynamic Polarisation Scans
3.3. Microstructural Analysis—Electrochemical Potentiostatic Polarisation
4. Discussion
4.1. Possible Factors Contributing to Breakdown Response
4.2. Proposed Trend of Sensitised AA5083 Microstructure
4.3. Final Remarks
5. Conclusions
- Starting the scan at −1.4 V (vs. SCE) results in an increase in surface pH due to the rapid evolution of hydrogen, which in turn causes active dissolution of part of the AA5083 microstructure, which is likely to be predominately the vulnerable β-Al3Mg2 phase;
- Under the test conditions employed in this study, AA5083 (sensitised) microstructures with a more extensive β-Al3Mg2 growth (from ca. 0.4% to 8.4%) recorded a more rapid increase in the measured current density after passive film breakdown (reaching 1 × 10−4 A cm−2 at ca. −0.63 V to −0.72 V vs. SCE);
- Under the test conditions employed in this study, a fitted correlation was found between the potential at which the current density reaches a pre-determined value, i.e., 1 × 10−4 A cm−2 after breakdown, and the extent of β-Al3Mg2 precipitation in the AA5083 microstructure.
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Al | Mg | Mn | Cr | Fe | Si | Cu | Zn |
---|---|---|---|---|---|---|---|
94.607 ± 0.439 | 3.909 ± 0.451 | 0.661 ± 0.051 | 0.079 ± 0.030 | 0.424 ± 0.034 | 0.147 ± 0.039 | 0.032 ± 0.006 | 0.021 ± 0.004 |
Isothermal Heat Treatment History | Duration (Hours) | Approximate Fraction of β-Al3Mg2 (and Dispersoid) (%) |
---|---|---|
Solutionised (450 °C) | 6 | 0.4 ± 0.1 |
Solutionised (450 °C, 6 h), then Sensitised (175 °C) | 48 | 2.0 ± 1.5 |
168 | 3.4 ± 0.5 | |
336 | 3.4 ± 0.3 | |
720 | 6.3 ± 0.5 | |
1440 | 6.4 ± 0.3 | |
2160 | 10.1 ± 0.6 | |
As-Received | - | 1.8 ± 0.1 |
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Liew, Y.; Wijesinghe, S.; Blackwood, D.J. Investigation of the Electrochemical Breakdown Response in Sensitised AA5083 Aluminium Alloy. Sustainability 2021, 13, 7342. https://doi.org/10.3390/su13137342
Liew Y, Wijesinghe S, Blackwood DJ. Investigation of the Electrochemical Breakdown Response in Sensitised AA5083 Aluminium Alloy. Sustainability. 2021; 13(13):7342. https://doi.org/10.3390/su13137342
Chicago/Turabian StyleLiew, YanHan, Sudesh Wijesinghe, and Daniel J. Blackwood. 2021. "Investigation of the Electrochemical Breakdown Response in Sensitised AA5083 Aluminium Alloy" Sustainability 13, no. 13: 7342. https://doi.org/10.3390/su13137342