在液态铅铋温度 350℃,流速控制在 0.5 m/s,饱和氧浓度(3.48×10-6wt.%)试验条件下,T91、15-15Ti、316L 三种样品动态腐蚀 1000 小时后,利用扫描电子显微镜(Scanning Electron Microscope,SEM)、能谱仪(Energy Dispersive Spectrometer,EDS)、X 射线衍射仪(X-ray diffraction,XRD)分析仪器对腐蚀样品进行观察分析得出的结论如下:
(1)T91 表面形成三层结构氧化膜,从外到内依次是 Fe3O4(磁铁矿)、Fe-Cr尖晶石和氧元素急剧下降的内氧化层,总的氧化膜厚度约为 3.7μm;氧化膜能够有效减缓液态铅铋对基体材料的腐蚀。
(2)15-15Ti 表面形成一层较薄的氧化膜,厚度约为 1.4 μm。
(3)316L表面形成一层较薄氧化膜,厚度约为 1.0 μm。
The temperature of liquid lead bismuth is 350 ℃, the flow rate is controlled at 0.5 m/s, and the saturated oxygen concentration is 3.48 × 10-6wt.%. Under the test conditions, after the dynamic corrosion of T91, 15-15Ti and 316L for 1000 hours, the corrosion samples were observed and analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The conclusions are as follows:
(1) Three-layer structure oxide film is formed on the surface of T91. From the outside to the inside, Fe3O4 (magnetite), Fe-Cr spinel and the internal oxide layer with sharp drop of oxygen elements are successively formed. The total thickness of the oxide film is about 3.7 μm;The oxide film can effectively slow down the corrosion of liquid lead bismuth to the matrix material.
(2) A thin oxide film is formed on the surface of 15-15Ti, with a thickness of about 1.4μm.
(3) A thin oxide film is formed on the surface of 316L, with a thickness of about 1.0 μm.