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高温、辐照以及强腐蚀所引起的Hastelloy N合金的失效问题是影响熔盐堆(Molten Salt Reactor,MSR)结构材料使用寿命中的关键问题。在常温下用4.5 MeV的He+离子辐照Hastelloy N合金,吸收剂量分别为:1×1015 He+·cm-2、5×1015He+·cm-2、1×1016 He+·cm-2,采用浸入法在700°C熔融氟化盐(FLiNaK)中进行300 h腐蚀试验,研究辐照剂量对合金耐腐蚀性的影响。利用扫描电子显微(Scanning Electron microscope,SEM)、同步辐射微束X射线荧光分析(Microbeam X-ray fluorescence,μ-XRF)对腐蚀后的样品进行分析测试。结果表明,随着辐照剂量的增大,合金的耐腐蚀性逐渐减弱。μ-XRF结果表明:Hastelloy N合金在熔融氟化盐中的腐蚀主要表现为合金中Cr元素的流失。
The failure of Hastelloy N alloy caused by high temperature, radiation and strong corrosion is a key issue affecting the service life of Molten Salt Reactor (MSR) structural materials. Hastelloy N alloy was irradiated with He + ions of 4.5 MeV at room temperature with the absorbed dose of 1 × 10 15 He + · cm -2,5 × 10 15 He + · cm -2 and 1 × 10 16 He + · cm -2, respectively. 300 h corrosion test was carried out in 700 ° C molten fluoridated salt (FLiNaK) to study the effect of irradiation dose on the corrosion resistance of the alloy. The corroded samples were analyzed by Scanning Electron Microscope (SEM) and Synchrotron Radiation Micro-Beam X-Ray Fluorescence (μ-XRF). The results show that with the increase of irradiation dose, the corrosion resistance of the alloy gradually weakened. The results of μ-XRF show that the corrosion of Hastelloy N alloy in molten fluoride is mainly caused by the loss of Cr in the alloy.