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以1.0 mol/L Al(NO_3)_3·9H_2O的乙醇溶液为电解液,用阴极微弧电沉积的方法在贫铀表面制备出厚度约为65μm的氧化铝陶瓷涂层。通过扫描电子显微镜(SEM)观察了涂层的表面和截面形貌,通过X射线衍射仪(XRD)及X射线能量色散谱(EDS)分析了涂层的成分以及相组成,通过电化学综合测试系统分析了涂层的电化学腐蚀性能。结果表明:涂层表面粗糙多孔,与基体呈犬牙咬合状结合;涂层主要由α-Al_2O_3和γ-Al_2O_3组成;涂层中含有少量的U元素,表明膜/基界面附近的贫铀基体在微弧放电的作用下也参与了成膜;沉积氧化铝涂层后,样品的腐蚀电流密度降低了2个数量级,耐腐蚀性能得到大幅度提高。
A 1.0μm thick Al (NO_3) _3 · 9H_2O solution was used as the electrolyte to prepare the alumina ceramic coating with a thickness of about 65μm on the depleted uranium surface by cathodic microarc deposition. The surface and cross-sectional morphology of the coating were observed by scanning electron microscopy (SEM). The composition and phase composition of the coating were analyzed by X-ray diffraction (XRD) and energy dispersive X-ray spectrometry (EDS) The electrochemical corrosion performance of the coating was systematically analyzed. The results show that the surface of the coating is rough and porous, and the interface of the coating is occlusal. The coating is mainly composed of α-Al_2O_3 and γ-Al_2O_3. The coating contains a small amount of U element, indicating that the depleted uranium matrix near the membrane / Under the action of arc discharge, the film formation was also involved. After the alumina coating was deposited, the corrosion current density of the sample was reduced by two orders of magnitude and the corrosion resistance was greatly improved.