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| Mechanism and Response Surface Model for Effect of Mn2+ on 304L and C25 Stainless Steels in High-temperature Nitric Acid |
SUN Xin1,2, QU Jiawei3, GAO Zilin3, ZHENG Yue3, MA Aili2( ), YAO Lin3( ), ZHANG Lianmin2, ZHENG Yugui2 |
1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 2.CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3.CNNC China Nuclear Power Engineering Co. Ltd., Beijing 100840, China |
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Cite this article:
SUN Xin, QU Jiawei, GAO Zilin, ZHENG Yue, MA Aili, YAO Lin, ZHANG Lianmin, ZHENG Yugui. Mechanism and Response Surface Model for Effect of Mn2+ on 304L and C25 Stainless Steels in High-temperature Nitric Acid. Journal of Chinese Society for Corrosion and protection, 2026, 46(4): 1015-1030.
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Abstract Spent nuclear fuel reprocessing equipment is exposed to high-temperature concentrated nitric acid for extended durations, and the Mn2+ ions produced during the process may affect the corrosion behavior of key stainless steel structural materials. Herein, the effect of three factors, namely temperature (60 ℃ to boiling point), nitric acid concentration (3-6 mol/L), and Mn2+ ion concentration (0.1-10 g/L) of high-temperature concentrated nitric acid solutions, and their interactions on the corrosion behavior of 304L and C25 austenitic stainless steels was investigated via immersion test, electrochemical measurement, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) analysis while a predictive model was established based on response surface methodology (RSM). The results show that temperature and nitric acid concentration are the dominant factors governing corrosion behavior, and their increase significantly accelerates the cathodic reaction, leading to an increase in corrosion current density (Icorr) and a decrease in polarization resistance (Rp). Mn2+ ions act as a secondary promoting factor, mainly by weakening the stability of the passive film (especially in medium and low acidity environments), thereby intensifying the corrosion. XPS analysis reveals that high concentrations of Mn2+ lead to a decrease in Fe content and enrichment of Cr oxides on the surface of 304L stainless steel. By comparing the corrosion characteristics of the two steels, it can be concluded that C25 stainless steel has better corrosion resistance than 304L in all conditions, these may be ascribed to higher Cr and Ni content and lower impurities for the C25 stainless steel. The RSM model successfully quantified the effect of each individual factor and their interactions and confirmed the order of the influence intensity of each factor as: temperature > nitric acid concentration ≫ Mn2+ concentration. The findings may provide a significant reference for the material selection and the determination of the safety window of process parameters for reprocessing equipment.
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Received: 16 September 2025
32134.14.1005.4537.2025.292
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| Fund: National Natural Science Foundation of China(52373321);IMR Innovation Fund(2023-PY03);Lingchuang Research Project of China National Nuclear Corporation(CNNC-LCKY-202274) |
Corresponding Authors:
MA Aili, E-mail: alma@imr.ac.cn; YAO Lin, E-mail: yaolin@cnpe.cc
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