LiCl-KCl共晶熔盐为乏燃料干法后处理中电解精炼过程常用的电解质,其对结构材料的腐蚀主要受熔盐中杂质的影响,通过熔盐纯化降低其腐蚀性是解决干法后处理材料腐蚀问题的重要手段之一。研究中使用电解法对LiCl-KCl盐进行纯化,通过循环...LiCl-KCl共晶熔盐为乏燃料干法后处理中电解精炼过程常用的电解质,其对结构材料的腐蚀主要受熔盐中杂质的影响,通过熔盐纯化降低其腐蚀性是解决干法后处理材料腐蚀问题的重要手段之一。研究中使用电解法对LiCl-KCl盐进行纯化,通过循环伏安电化学方法监测纯化过程,并使用电感耦合原子发射质谱(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测量LiCl-KCl盐纯化前后杂质元素含量。同时在773K、氩气环境下开展Inconel 600在纯化前后LiCl-KCl熔盐中500h的浸泡腐蚀实验,使用扫描电镜(Scanning Electron Microscopy,SEM)、X射线衍射仪(X-ray Diffractometer,XRD)对腐蚀后试样进行表征。结果显示:电解纯化对LiCl-KCl盐内金属离子杂质的去除效果显著,有效减缓了高温熔盐对Inconel 600的腐蚀。展开更多
Inconel 600 alloy is widely utilized for high temperature environment application due to the corresponding good oxidation and corrosion resistance properties.In order to estimate the high temperature oxidation resista...Inconel 600 alloy is widely utilized for high temperature environment application due to the corresponding good oxidation and corrosion resistance properties.In order to estimate the high temperature oxidation resistance of Inconel 600 alloy at various temperatures,the oxidation weight gain of all specimens was measured and fitted for the curve at the temperatures of 700,800 and 900 ℃ for exposure time of 100 h.The surface morphology and the component of the oxide film were analyzed by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS) and X-ray diffraction(XRD).The results indicate that the high temperature oxidation resistance of Inconel 600 alloy is excellent blew 800℃ due to the oxidation kinetic curves at different temperatures corresponding to the parabola dynamic rules.This means that the oxidation film protects the substrate well.The dense oxide layer formation containing Cr_(2)O_(3) and NiCr_(2)O_(4) at 700 and 800 ℃ and MnCr_(2)O_(4) at 900 ℃,respectively,is the main reason for the good oxidation resistance.In contrast,the oxide layer peels off easily under applied force as the temperature increases beyond 800℃, on account of the complicated compositions of the oxide film and the binding force between the oxide layer and the substrate weakening.Corresponding oxidation mechanism is expected to be understood and the oxidation resistance of Inconel 600 alloy is improved through binding force enhancement.展开更多
文摘LiCl-KCl共晶熔盐为乏燃料干法后处理中电解精炼过程常用的电解质,其对结构材料的腐蚀主要受熔盐中杂质的影响,通过熔盐纯化降低其腐蚀性是解决干法后处理材料腐蚀问题的重要手段之一。研究中使用电解法对LiCl-KCl盐进行纯化,通过循环伏安电化学方法监测纯化过程,并使用电感耦合原子发射质谱(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测量LiCl-KCl盐纯化前后杂质元素含量。同时在773K、氩气环境下开展Inconel 600在纯化前后LiCl-KCl熔盐中500h的浸泡腐蚀实验,使用扫描电镜(Scanning Electron Microscopy,SEM)、X射线衍射仪(X-ray Diffractometer,XRD)对腐蚀后试样进行表征。结果显示:电解纯化对LiCl-KCl盐内金属离子杂质的去除效果显著,有效减缓了高温熔盐对Inconel 600的腐蚀。
基金financially supported by the National Key Research and Development Program of China(No.2012AA03A501)。
文摘Inconel 600 alloy is widely utilized for high temperature environment application due to the corresponding good oxidation and corrosion resistance properties.In order to estimate the high temperature oxidation resistance of Inconel 600 alloy at various temperatures,the oxidation weight gain of all specimens was measured and fitted for the curve at the temperatures of 700,800 and 900 ℃ for exposure time of 100 h.The surface morphology and the component of the oxide film were analyzed by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS) and X-ray diffraction(XRD).The results indicate that the high temperature oxidation resistance of Inconel 600 alloy is excellent blew 800℃ due to the oxidation kinetic curves at different temperatures corresponding to the parabola dynamic rules.This means that the oxidation film protects the substrate well.The dense oxide layer formation containing Cr_(2)O_(3) and NiCr_(2)O_(4) at 700 and 800 ℃ and MnCr_(2)O_(4) at 900 ℃,respectively,is the main reason for the good oxidation resistance.In contrast,the oxide layer peels off easily under applied force as the temperature increases beyond 800℃, on account of the complicated compositions of the oxide film and the binding force between the oxide layer and the substrate weakening.Corresponding oxidation mechanism is expected to be understood and the oxidation resistance of Inconel 600 alloy is improved through binding force enhancement.
