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首页> 外文期刊>Materials and Corrosion >Refractory metals and nickel in high temperature chlorine-containing environments - thermodynamic prediction of volatile corrosion products and surface reaction mechanisms: a review
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Refractory metals and nickel in high temperature chlorine-containing environments - thermodynamic prediction of volatile corrosion products and surface reaction mechanisms: a review

机译：高温含氯环境中的难熔金属和镍-挥发性腐蚀产物和表面反应机理的热力学预测：综述

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摘要

Thermodynamic calculations are an important tool for prediction of chemical reactions. In many cases the results help to understand and describe the experimental observations. In others, especially if reaction kinetics play a major role, their predictive value can be rather limited and the projected results have to be treated with care. One such case are high temperature chlorine corrosion conditions. For example, thermodynamically a similar corrosion behavior of nickel and molybdenum is predicted in chlorine-containing atmospheres at low oxygen partial pressures. In contrast to their calculated similarity, experimental results showed much higher resistance of molybdenum against the chlorinating attack. Above 800 degrees C nickel is rapidly consumed, whereas molybdenum remains almost inert. This paper reviews the literature on the corrosion mechanisms and kinetics of nickel and molybdenum in chlorine-containing environments as well as in mixed oxygen-chlorine-containing atmospheres. Based on the literature review, differences in their reaction kinetics are discussed, taking into account the deviation from an ideal thermodynamic correlation between the partial pressure and the reaction kinetics via the often used Hertz-Langmuir equation. Finally it is shown that the findings concerning the special characteristics of molybdenum and nickel and the conclusions drawn from experimental observations on high temperature chlorine corrosion can also be transferred to other metals.
机译：热力学计算是预测化学反应的重要工具。在许多情况下，结果有助于理解和描述实验观察结果。在其他情况下，尤其是在反应动力学起主要作用的情况下，其预测价值可能会受到很大限制，并且必须谨慎对待预测结果。一种这样的情况是高温氯腐蚀条件。例如，在低氧分压下，在含氯气氛中，热力学上预测了镍和钼的相似腐蚀行为。与计算出的相似度相反，实验结果表明钼对氯化侵蚀的抵抗力更高。高于800摄氏度，镍被迅速消耗掉，而钼几乎保持惰性。本文回顾了有关含氯环境以及含氧氯气混合环境中镍和钼的腐蚀机理和动力学的文献。根据文献综述，通过经常使用的Hertz-Langmuir方程，考虑了分压与反应动力学之间理想热力学相关性的偏差，讨论了它们的反应动力学差异。最后表明，关于钼和镍的特殊特性的发现以及从高温氯腐蚀实验观察得出的结论也可以转移到其他金属上。

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