Al2 O3/Al 复合涂层对贫铀的保护性能研究

为探讨Al2O3/Al复合涂层在贫铀表面保护中应用的可行性,采用盐雾腐蚀试验和磨损试验方法,结合SEM/EDS和XRD表征,分析了贫铀表面Al2O3/Al复合涂层的保护性能.结果表明,贫铀表面反应磁控溅射Al2O3/Al涂层没有明显的腐蚀特征,而等离子喷涂Al2O3/Al涂层发生了严重的腐蚀剥落现象.Al2O3/Al涂层表现为磨粒磨损行为,抗磨损性好.作为对比样的贫铀表面Al涂层则表现为粘着磨损行为,抗磨损性差.讨论了贫铀表面涂层的腐蚀和磨损行为.

Protection of Depleted Uranium by Al2O3/Al Composite Coatings

Since depleted uranium is chemically active and easily oxidized in environment, it is very important in nuclear engineering to effectively protect depleted uranium. This is why the protection of the depleted uranium has been focused on for many years. Thus two types of Al_2O_3/Al composite coatings prepared by different physical vapor deposition techniques were used to protect the depleted uranium in the present work, using the Al coating as a reference. The applicability of the Al_2O_3/Al composite coatings in the protection of the depleted uranium was investigated by means of salt spray test in 5%NaCl solution and abrasion test, in combination with scanning electron microscopic/energy dispersive spectroscopic and X ray diffraction analyses. As the results, no obvious corrosion was observed for the reactive magnetron sputtered Al_2O_3/Al composite coating on the depleted uranium, but serious corrosion spalling was observed for the plasma sprayed Al_2O_3/Al composite coating. Both the two types of Al_2O_3/Al composite coatings had much better wear resistance and corrosion resistance than Al coating. Specifically, the reactive magnetron sputtered Al_2O_3/Al composite coating could be used to effectively protect the depleted uranium.