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研究了炉前材料20G成膜条件下在模拟加氧水(OT)工况和还原性全挥发处理(AVT(R))工况高温水溶液中的电化学行为。用SEM,EDS和XRD对腐蚀产物膜的表面形貌和成分进行表征。结果表明:在40~140℃范围内,20G在OT工况中的腐蚀电流密度随着温度的升高而增加,EIS低频区有Warburg阻抗,电极反应属于混合控制;在AVT(R)溶液中腐蚀电流随着温度的升高先增大后减小;EIS高频区的容抗弧半径随着温度的升高在120℃出现最小值。XRD分析表明,材料表面形成了微米级腐蚀产物膜层,其主要成分为Fe3O4。
The electrochemical behavior of 20G under the condition of simulating oxygenated water (OT) and reducing temperature volatilization (AVT (R)) was studied. The surface morphology and composition of the corrosion product film were characterized by SEM, EDS and XRD. The results show that the corrosion current density of 20G increases with the increase of temperature and the Warburg impedance in the low frequency region of EIS under the temperature of 40-140 ℃. The electrode reaction belongs to mixed control. In AVT (R) solution The corrosion current first increases and then decreases with the increase of temperature. The arc radius of capacitive reactance of high frequency region of EIS shows the minimum value at 120 ℃ with the increase of temperature. XRD analysis showed that a micro-scale corrosion product film was formed on the surface of the material, and the main component was Fe3O4.