Abstract
The corrosion behavior of both AA 2024 and AA 6061 aluminum alloys in 0.5M HCl before and after solution treatment at room temperature (25 oC) was investigated in this paper to know the effect of the solution heat treatment on the corrᴏsion behavior of both 2024 and 606 aluminum alloys. Using the cyclic polarization test, the corrosion resistance of AA 2024 aircraft aluminum alloy decreases after solution treatment at 495 oC for 2hr from (9.490×10-3 mm/y) to (1.309×10-3 mm/y), while the corrosion resistance of AA6061 aircraft aluminum alloy decreases after solution treatment at 530 oC for 2hr from (886.3× 10-3 mm/y) to (1.270×10-3 mm/y). Pitting corrosion was the prevalent type of corrosion for both alloys.
Highlights
Aluminum is has excellent corrosion resistance and the Al alloys are categorized into three groups, namely: casting alloys, wrought NHT alloys, and wrought HT alloys
As for the precipitated phases, they represent the phases of the metal compounds that were recorded by X-ray diffraction (After heat treatments, AL2Cu and Al2CuMg phase formed in 2024 AA while after heat treatments, Mg2Si phase formed in 6061 AA)
In "Fig. 6", and ''fig. (7-a, b, c, d)'' are showing the Potentiodynamic polarization curves for AA2024 before and after heat treatment in 0.5 M HCl from these figures show that the 2024 alloy as received is less affected by pitting corrosion and gets re-passivation potential (Erep) means to have high resistance to corrosion conditions, while the 2024 alloy after heat treatment is more prone to pitting corrosion and there is no re-passivation potential (Erep) and it is constantly and dangerously decaying
Summary
Aluminum is has excellent corrosion resistance and the Al alloys are categorized into three groups, namely: casting alloys, wrought NHT alloys, and wrought HT alloys. In open air solutions containing halide ions, with chlorine being the most common, aluminum is susceptible to pitting corrosion This process occurs, because in the presence of oxygen, the metal is readily polarized to the pitting potential, and because the chlorides contribute to the formation of soluble chlorinated aluminum oxide (Hydro) which interferes with the formation of a stable oxide on the aluminum surface. 2000, 6000, are widely used in airframes [6].2024 alloy plates are known for their excellent fracture toughness and fatigue crack propagation characteristics, and good machinery, high strength, high fatigue strength, and corrosion resistance. Rajaa et al.)[8] Studied the artificial aging and solution heat treatment effect on the Al 6061-T6 alloy's hardness and tensile strength (mechanical properties). AA 6061 is an alloy that can be heat treated and is easy to form and its resistance to corrosion is excellent and weldable [10] It is commonly used in lightweight aircraft, especially homemade airplanes. The result doesn't reflect the corrosion activity, and the result of the scan and polarization may be incorrect [11]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Engineering and Sustainable Development
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
