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采用失重法和电化学方法研究了铬酸钠对铀钛合金在200 mg/L氯化钠溶液中的缓蚀作用,并用X射线光电子能谱(XPS)和激光共聚焦显微镜分析铀钛合金表面氧化物成分和形貌。结果表明,铬酸钠属于阳极型钝化剂,缓蚀效率随浓度的增加而增大。但溶液温度对铬酸钠的缓蚀效率影响较大,溶液温度高于45℃时,加入100 mg/L的铬酸钠对铀钛合金具有加速腐蚀作用。XPS分析表明,铀钛合金表面形成的钝化膜中铀的氧化物存在两种形式,最外层为UO2+x,内层为UO2;加入铬酸钠后,钝化膜最外层含有UO2+x和多种铬化合物,厚度小于3 nm。
The corrosion inhibition effect of sodium chromate on Uranium-Titanium alloy in 200 mg / L sodium chloride solution was studied by weight loss method and electrochemical method. X-ray photoelectron spectroscopy (XPS) and confocal laser scanning microscope Oxide composition and morphology. The results show that sodium chromate belongs to the anode passivating agent, and the corrosion inhibition efficiency increases with the increase of the concentration. However, the solution temperature has a great effect on the corrosion inhibition efficiency of sodium chromate. When the solution temperature is higher than 45 ℃, the addition of 100 mg / L sodium chromate accelerates the corrosion of uranium-titanium alloy. XPS analysis showed that there are two forms of uranium oxide in the passive film formed on the surface of uranium titanium alloy, the outermost layer is UO2 + x and the inner layer is UO2. After adding sodium chromate, the outermost layer of the passivation film contains UO2 + x and a variety of chromium compounds, the thickness of less than 3 nm.