Abstract
The microstructure and corrosion behavior of 7B85 Al alloy was investigated systematically by ultrasonic surface rolling treatment (USRT). The results show that the accumulation of large plastic strain leads to the appearance of a high density of dislocation lines and dislocation tangles during the ultrasonic rolling. The USRT alloy has better corrosion behavior, and its corrosion type is typical pitting corrosion, accompanied by stress corrosion. The more positive Epit indicates that the USRT alloy develops a stable surface resistant to pitting. The corrosion products are mainly stable Al2O3 and quasi-stable Al(OH)3. The fine grain and micro-stress caused by dislocation accumulation are helpful for the formation of dense corrosion product films because more stable Al2O3 is formed, which restrains the Cl− ions from diffusing into the Al matrix via the localized pits.
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Acknowledgements
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China [No. 51871114], and the Natural Science Foundation of Jiangxi Province [No. 20192ACB20003].
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Zeng, L., Xu, G., Wang, C. et al. Microstructure and Corrosion Behavior of Ultrasonic Surface Treated 7B85 Al Alloy. JOM 75, 86–96 (2023). https://doi.org/10.1007/s11837-022-05449-z
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DOI: https://doi.org/10.1007/s11837-022-05449-z