Zhu Huiping, Du Xiaochao, Liu Xudong, Yan Tingxu, Li Xiaobo, Wang Yifeng, Qi Muran, Tu Xu
School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China.
College of Science, Three Corges University, Yichang 443002, China.
Materials (Basel). 2021 Dec 23;15(1):102. doi: 10.3390/ma15010102.
In this work, the wetting behaviors of lead-bismuth eutectic (LBE) on corroded 316L, T91, and CLAM surfaces were studied. The wettability of LBE on virgin and corroded surfaces were tested at 450 °C by using the sessile-drop (SD) method after immersing the samples in LBE with saturated oxygen concentration for 400, 800, and 1200 h at 450 °C. Additionally, the morphology, as well as element distribution of the corrosion structure, were characterized by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results showed that the virgin samples of three materials are non-wetting to LBE, and the formation of corrosion structures further reduces the wettability. Besides, the thickness of the corrosion layer formed on the 316L surface grew more slowly than the other two steel, which results in better corrosion resistance of austenitic steel 316L than that of ferritic/martensitic steels T91 and CLAM at 450 °C. Meanwhile, the morphology and distribution of corrosion products are important factors affecting the wettability of the steel surface. The formation of corrosion products with high roughness as well as disorder results in a significant reduction in surface wettability.
在这项工作中，研究了铅铋共晶（LBE）在腐蚀后的316L、T91和CLAM表面的润湿行为。将样品在450℃下于饱和氧浓度的LBE中浸泡400、800和1200小时后，采用静滴法（SD）在450℃下测试了LBE在原始和腐蚀表面上的润湿性。此外，通过扫描电子显微镜（SEM）和能量色散X射线光谱仪（EDS）对腐蚀结构的形态以及元素分布进行了表征。结果表明，三种材料的原始样品对LBE不润湿，腐蚀结构的形成进一步降低了润湿性。此外，316L表面形成的腐蚀层厚度比其他两种钢增长得更慢，这导致奥氏体不锈钢316L在450℃下的耐腐蚀性优于铁素体/马氏体钢T91和CLAM。同时，腐蚀产物的形态和分布是影响钢表面润湿性的重要因素。具有高粗糙度和无序性的腐蚀产物的形成导致表面润湿性显著降低。
