Abstract
Effect due to ageing time and stress on the corrosion
behavior of Aluminum-Coper alloy AA 2024-T6 is studied. The
alloy specimens were aged for 6 hrs, 9 hrs and 12 hrs ageing time
and then subjected to corrosion testing in saturated Sodium
Chloride (NaCl) solution. Constant Stress of 0.25Ꮄy
(yield
strength) using four point bend apparatus is applied on a 9 hrs
aged sample and this setup is immersed in the saturated NaCl
solution to study the effect of stress. Polarization curves of the
aged specimens having same exposed area showed that the
specimens corroded majorly by pitting mechanism which is
supported from SEM micrographs. The sample aged for 9 hrs
had the least corrosion resistance but the samples aged for 6 hrs
and 12 hrs had 11% and 28% increase in the corrosion resistance.
However, the sample aged for 9 hrs had the highest hardness,
making it a good candidate out of the three for structural
applications where corrosion resistance is also important.
Polarization curves of non-stressed and stressed specimens having
same exposed area showed a 70% increase in the corrosion rate of
the latter, calculated from the marked area of the polarization
curves along with a decrease in the passive region. The former
corroded by pitting mechanism while the latter corroded by filmdissolution mechanism which is inferred from SEM micrographs.
Zaigham Saeed Toor, Ishaq Ahmed, Sajid Ullah, Akbar Niaz Butt, Syed Wilayat Hussain. (2018) Influence of Ageing time and Stress on Corrosion behavior of AA2024-T6 in saturated NaCl Solution, Journal of Space Technology , Volume 8, Issue 1.
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