Understanding of tribocorrosion and corrosion characteristics of 304L stainless steel in hot concentrated nitric acid solution

Spent fuel reprocessing plays a pivotal role in achieving efficient recycling of nuclear fuel. Among the different forms of failure encountered in spent fuel reprocessing, tribocorrosion stands out as a critical concern. Herein, the tribocorrosion behavior, as well as the corrosion behavior, of 304L stainless steel (SS) in high-temperature concentrated nitric acid was investigated. The results indicated that 304L SS formed a thin (1.54 nm) and stable passive film on the surface, imparting high resistance to nitric acid corrosion. Meanwhile, it was found that the synergistic effect between corrosion and wear accounted for a high total tribocorrosion weight loss of over 85%, implying the dominant role of the synergistic effect in the tribocorrosion process. Furthermore, the wear of 304L SS in deionized water revealed both abrasive and adhesive wear characterizations, whereas the tribocorrosion in nitric acid only exhibited abrasive wear feature. Eventually, the tribocorrosion and corrosion models of 304L SS in hot concentrated nitric acid were proposed based on the comprehensive experimental findings. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic) 304L (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic), 304L (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)((sic)(sic) 85%), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic), 304L (sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic) 304L (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).