预辐照对铍在EDM-1中冲刷腐蚀的影响

本文通过构建旋转式冲刷腐蚀实验装置来研究中子和γ预辐照对铍在EDM-1(1号电火花加工油)中冲刷腐蚀的影响。用天平测量铍试样质量变化,用扫描电子显微镜观察其微观形貌,用X射线光电子能谱仪分析表面成分。实验结果表明,在腐蚀前期以腐蚀介质与铍表面发生化学反应生成腐蚀产物为主,在腐蚀后期以腐蚀介质对铍的机械冲刷腐蚀为主;EDM-1中的硫元素在腐蚀过程中转变成氧化物SOx和SO2,分别以化学和物理吸附分布在腐蚀产物表面和内部;对比相同腐蚀条件下受不同预辐照铍试样的腐蚀程度,受单独γ预辐照的铍试样的腐蚀程度最大,受中子和γ共同预辐照的铍试样的次之,未经预辐照的铍试样的腐蚀程度最轻,表明预辐照促进了铍在EDM-1中的腐蚀。

Pre-irradiation Effect on Corrosion of Be in EDM-1

The rotary corrosion experiment device was built to study the pre-irradiation effect on corrosion of Be in EDM-1 (No.1 electrical discharge machining oil).With the samples,the mass variations were measured by scales,the microstructure was observed by scanning electron microscope and the composition was analyzed by X-ray photoelectron spectroscopy,respectively.The results indicate that the chemical reaction between the Be and EDM-1 is dominated and corrosive products are generated in the initial experimental stage.Then the mechanical scour becomes the main process in Be corrosion.SOx and SO2 are adsorbed chemically on the surface and physically in interior of the corrosive products,respectively.It is revealed that the degree of Be corrosion is serious,reasonable and weak respectively with pre-irradiation only by γ-rays,with pre-irradiation both by neutrons and γ-rays and without pre-irradiation.As a conclusion,the pre-irradiation can promote the corrosion of Be in EDM-1.