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    敏化处理对超纯奥氏体不锈钢C25耐蚀性的影响

    Effect of Sensitization Treatment on the Corrosion Resistance of Ultrapure Austenitic Stainless Steel C25

    • 摘要: 采用浸泡试验,研究了乏燃料后处理设备用超纯奥氏体不锈钢C25经过不同热处理制度处理后,在65%(质量分数,下同)HNO3和30% HNO3+100 mg/L Cr6+溶液中的腐蚀行为,分析了敏化温度对腐蚀行为的影响。结果表明:超纯奥氏体不锈钢C25在65%HNO3中的均匀腐蚀速率很低,晶间腐蚀倾向很小,在30% HNO3+100 mg/L Cr6+溶液中的均匀腐蚀速率较高,晶间腐蚀较为严重;对敏化处理后C25不锈钢进行浸泡腐蚀试验,在两种溶液中经650 ℃×2 h空冷敏化处理的试样均表现出最强的晶间腐蚀敏感性。

       

      Abstract: The corrosion behavior of ultra-pure austenitic stainless steel C25 after different heat treatment regimes, which used in spent fuel reprocessing equipment, was studied via immersion tests in 65% (mass fraction, hereafter the same) HNO3 solution and 30% HNO3 + 100 mg/L Cr6+ solution. The effect of sensitization temperature on corrosion behavior was analyzed. The results indicate that ultra-pure austenitic stainless steel C25 exhibited a very low uniform corrosion rate in 65% HNO3, along with minimal intergranular corrosion tendency. In contrast, the uniform corrosion rate increased significantly in 30% HNO3 + 100 mg/L Cr6+ solution, with more severe intergranular corrosion being observed. After sensitization treatment, immersion corrosion tests revealed that C25 stainless steel samples treated at 650 ℃ for 2 h (air-cooled) exhibited the highest intergranular corrosion susceptibility in the both solutions.

       

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