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A thermodynamic study of the chemical speciation of cesium and boric acid on an oxidized stainless steel surface.

机译：氧化不锈钢表面上铯和硼酸化学形态的热力学研究。

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摘要

The objective of this dissertation is to investigate the effects of cesium hydroxide and boric acid on oxidized stainless steel surfaces at high temperatures and one atmosphere of pressure. This is the first experimental investigation of this chemical system. The experimental investigations were performed using a mass spectrometer and a mass electrobalance. An examination of the surface from the different experiments were conducted using a scanning electron microscope (SEM) to identify the presence of deposited species, and electron spectroscopy for chemical analysis (ESCA) to identify the species deposited on the surface.;A better understanding of the equilibrium thermodynamics, the kinetics of the steam accelerated volatilizations and the release kinetics are gained by these experiments. The release rate is characterized by bulk vaporization/gas-phase mass transfer data. The analysis couples vaporization, deposition and desorption of the compounds formed by cesium hydroxide and boric acid under conditions similar to that expected during certain nuclear reactor accidents.;This study shows that cesium deposits on an oxidized stainless steel surface at temperatures between 1000 to 1200 Kelvin. Cesium also deposits on stainless steel surfaces coated with boric oxide in the same temperature ranges. The mechanism for cesium deposition onto the oxide layer was found to involve the chemical reaction between cesium and chromate. Some revaporization in the cesium hydroxide-boric acid system was observed. It has been found that under the conditions used boric acid will react with cesium hydroxide to form cesium metaborate. A model is proposed for this chemical reaction.
机译：本文的目的是研究氢氧化铯和硼酸在高温和一个大气压下对氧化不锈钢表面的影响。这是对该化学系统的首次实验研究。实验研究使用质谱仪和质量电平衡仪进行。使用扫描电子显微镜（SEM）来确定不同实验的表面，以识别沉积物的存在，并使用化学电子光谱（ESCA）来识别沉积在表面上的物。通过这些实验获得了平衡热力学，蒸汽加速挥发的动力学和释放动力学。释放速率的特征在于整体蒸发/气相传质数据。该分析将氢氧化铯和硼酸形成的化合物的汽化，沉积和脱附在类似于某些核反应堆事故中预期的条件下进行;该研究表明，铯沉积在1000至1200开氏温度之间的氧化不锈钢表面上。铯还会在相同温度范围内沉积在涂有氧化硼的不锈钢表面上。发现铯沉积到氧化物层上的机理涉及铯和铬酸盐之间的化学反应。在氢氧化铯-硼酸体系中观察到一些再蒸发。已经发现在所用的条件下，硼酸将与氢氧化铯反应形成偏硼酸铯。提出了用于该化学反应的模型。

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  • 作者

    Grossman, Naomi Joyce.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Engineering Nuclear.;Engineering Chemical.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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