Abstract
Al foil with high formability and corrosion resistance is highly desired for lithium-ion battery soft packaging. Annealing treatment has a significant impact on the performance of soft packaging Al foil. The effects of both La content and the annealing temperature on the microstructure, mechanical properties, and corrosion behavior of Al-1.5Fe-La alloy was investigated through optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile testing, potentiodynamic polarization testing, and electrochemical impedance spectroscopy (EIS) testing. A higher addition of La resulted in the formation of AlFeLa particles and a refinement of the Fe-rich second phase. The Al-1.5Fe-0.25La alloy had a higher formability and corrosion resistance than the Al-1.5Fe-0.1La alloy. Microstructure analysis indicated that recovery, recrystallization, and grain growth successively occurred in the Al-Fe-La alloy with the increase of the annealing temperature from 200 °C to 250 and 380 °C. After annealing at 250 °C, the Al-Fe-La alloys had the highest corrosion resistance due to refined grain and a high fraction of small-angle grain boundaries.
Highlights
Due to excellent performance in formability and corrosion resistance, Al foil and its composite film are widely used in the packaging industry, including food, medicine, and electronic products, especially the Li-ion battery [1,2,3]
◦ C (Figures 1c and 2c), finer equiaxed grains grew into coarse grains
When the annealing temperature increased to 380 °C (Figures 1c and 2c), finer equiaxed grains grew into coarse grains
Summary
Due to excellent performance in formability and corrosion resistance, Al foil and its composite film are widely used in the packaging industry, including food, medicine, and electronic products, especially the Li-ion battery [1,2,3]. Traditional 8011 alloys with low formability and corrosion resistance cannot satisfy the higher requirements of Li-ion battery packaging. Rare earth elements can strongly improve the mechanical properties and corrosion resistance of Al alloys [4,5,6,7,8]. Mi et al [9] found that with 1.5 wt % La, flower-like Al3 Fe replaced the original acicular phase, and an Al11 La3 phase was formed in the subrapidly solidified Al-5Fe alloy. Li et al [10]
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