Characterization of corrosion phenomena and kinetics on T91 ferritic/martensitic steel exposed at 450 and 550 °C to flowing Pb-Bi eutectic with 10−7 mass% dissolved oxygen
Characterization of corrosion phenomena and kinetics on T91 ferritic/martensitic steel exposed at 450 and 550 °C to flowing Pb-Bi eutectic with 10−7 mass% dissolved oxygen
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DOI：
10.1016/j.jnucmat.2017.07.031
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发表时间：
2017-10
影响因子：
3.1
通讯作者：
V. Tsisar;C. Schroer;O. Wedemeyer;A. Skrypnik;J. Konys
中科院分区：
文献类型：
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作者：
V. Tsisar;C. Schroer;O. Wedemeyer;A. Skrypnik;J. Konys
在450 ° C和550 °C下，研究了两种不同Cr含量的T91铁素体/马氏体钢在含10−7mass%O的Pb-Bi流动（2 m/s）中的腐蚀行为。观察到的腐蚀模式为：形成保护性氧化皮;加速氧化和溶液腐蚀。在450 °C下加速氧化导致在2000 h暴露后约10 μm的一般金属衰退，在550 °C下2000 h暴露后约15 μm。更严重的局部溶液腐蚀导致最大侵蚀深度分别为50-960 μm和115-190 μm。450 °C时，溶液腐蚀孕育期为500-5000 h，550 °C时≤500 h。T91钢一炉中铬含量稍高，通过提高铬基氧化膜的稳定性延长孕育期。
Corrosion behavior of two heats of T91 ferritic/martensitic steel, with slightly different Cr content, was investigated in flowing (2 m/s) Pb-Bi with 10−7mass%O at 450 and 550 °C. The observed corrosion modes are: protective scale formation; accelerated oxidation and solution-based corrosion attack. Accelerated oxidation at 450 °C results in general metal recession of about 10 μm after ∼9000 h exposure and ∼15 μm at 550 °C after 2000 h. More severe and local solution-based corrosion results in a maximum depth of attack of 50–960 μm and 115–190 μm, correspondingly. Incubation period for solution-based corrosion is 500–5000 h at 450 °C and ≤500 h at 550 °C. The slightly higher chromium content in one of the heat of T91 steel prolongs the incubation period by improving the stability of the Cr-based oxide film.