| Citation: | GUO Y，LIU D J，CHANG X L，et al. Corrosion behavior of 2195-T8 aluminum-lithium alloy with artificial defects in 30% HNO3[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（3）：896-903 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0344
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To study the corrosion performance of the 2195-T8 Al-Li alloy in an acidic medium, the corrosion morphology of 2195-T8 Al-Li alloy in 30% HNO3 was analyzed by scanning electron microscope (SEM), scanning transmission electron microscopy (STEM) and other microscopic characterization methods. A method for processing images that combines edge detection and block segmentation is also suggested in order to examine the corrosion law of 2195-T8 Al-Li alloy in 30% HNO3 from a statistical perspective. The results show that the typical pitting and intergranular corrosion morphologies of the alloys appear after immersion at different times. The depth of artificial defects can accelerate the progression of corrosion. While the number and area of pits fluctuate little in the middle and later phases of corrosion, only a small number can continue to expand to create etch pits with an area >50 μm2. In the early stages of corrosion, the number of pits increases rapidly, and the pit area is primarily concentrated in 0～20 μm2.
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