Abstract
In this work, the effect of ageing and retrogression on the polarization resistance of the Al 6061 was assessed, in order to improve the corrosion resistance of the alloy with a negligible effect on the tensile strength. The corrosion resistance behavior was studied by exposing an Al 6061 alloy to a simulated marine environment, and then, the corrosion current density (icorr) was measured. The obtained corrosion results were correlated with tensile strength (TS) reported elsewhere and both measured, the icorr and TS and both were modeled by multiple linear regression. The results showed that the polarization resistance is inversely proportional to the temperature increment of the ageing and retrogression processes. In addition, the samples subjected to 200 °C of ageing and 250 °C of retrogression temperatures exhibited an enhancement on both corrosion resistance and tensile strength, when compared to the T6 condition and to lower ageing and retrogression temperatures. Furthermore, an empirical equation was proposed to correlate the icorr as a function of heat treatment parameters such as: ageing temperature and retrogression time–temperature for the aluminium alloy.
Original language | English |
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Pages (from-to) | 2725-2735 |
Number of pages | 11 |
Journal | Transactions of the Indian Institute of Metals |
Volume | 75 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2022 |
Externally published | Yes |
Bibliographical note
Funding Information:In memory of Dr. Sergio A. Serna, mentor, friend, and collaborator, who passed away during the COVID-19 pandemic, but even to the end he taught their students, not only to carry out research, also to face the challenges in life. We acknowledge Dr. Iván Puente-Lee, for the assistance in testing and scanning electron microscopy.
Publisher Copyright:
© 2022, The Indian Institute of Metals - IIM.
Keywords
- Ageing
- Aluminium alloy
- Corrosion resistance
- Retrogression
- Tensile strength