Abstract
In this paper, the effects of an aging treatment on the corrosion resistance/mechanism of a tensile deformed Al-Cu-Mn-Fe-Zr alloy are investigated. The impedance magnitude and polarization resistance increase, while the corrosion current decreases with the increased aging time and temperature. The discontinuously-distributed precipitates and precipitation-free zone, which can cut the corrosion channels, appear at grain boundaries when the temperature is relatively high and the aging time is relatively long. They can improve the corrosion resistance. Additionally, the intergranular and pitting corrosion are the main mechanisms. The intergranular corrosion is likely to occur in an under-aged alloy. This is because the potential difference between the grain boundaries and grains is high, due to the segregation of Cu atoms. When the aging degree is increased, the grain boundary precipitates reduce the potential difference, and the intragranular precipitates make the surrounding matrix prone to dissolution. As such, the pitting corrosion is likely to occur in the over-aged alloys.
Highlights
Because of their outstanding mechanical and physical properties, aluminum alloys are widely used in the fields of ship building and aerospace [1,2,3,4]
The electrochemical impedance spectroscopy (EIS) measurements were conducted with an alternating current (AC) signal, of which the frequency ranged from 0.01 Hz to 100 KHz and the amplitude was 10 mV
In order to investigate the effects of the aging treatment on corrosion morphology, a scanning electron microscope (SEM) (FEI Electron Optics B.V; Prague, Czech Republic), optical microscope (OM), and laser scanning confocal microscope (LSCM) were used
Summary
Many scholars have studied the effects of aging on the precipitation kinetics [14,15], corrosion resistance [16,17,18], as well as some other mechanical properties of Al-Cu alloys [19,20,21,22,23,24]. Found that pre-deformation can increase the θ0 phase within grains and improve the corrosion resistance of a 2219 alloy. Materials 2021, 14, 5062 found that pre-deformation can increase the θ′ phase within grains and improve the corrosion resistance of a 2219 alloy. To discuss corimpedance spectroscopy (EIS) and polarization curves of the aged alloy are measured in orrosion the corrosion properties and corrosion morphology the aged alloy der to mechanisms, discuss the effects of aging on corrosion resistance. The corrosion properties and corrosion morphology of the aged alloy are analyzed
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