Potential-pH diagrams at elevatedtemperature for the system Fe-H2O
Potential-pH diagrams at elevatedtemperature for the system Fe-H2O
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DOI：
10.1016/s0010-938x(70)80025-7
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发表时间：
1970
影响因子：
8.3
通讯作者：
H. Townsend
中科院分区：
文献类型：
--
作者：
H. Townsend
给出了Fe-H_2 O体系在60、100、150和200°C温度下的电位-pH图。这些都是在缺乏一些高温热力学数据的情况下，使用Criss和Cobble的外推方法结合25°C离子熵的经验关系构建的。随着温度的升高，图中的显着变化是由于离子HFeO 2的稳定性增加而导致的高pH介质中的腐蚀区域扩大。这种变化与（1）阴极保护有关，在更高的温度和pH值下可能变得更加困难，以及（2）钢的苛性碱开裂，这似乎发生在HFeO 2 −稳定的地方。
Potential-pH diagrams at temperatures of 60, 100, 150 and 200°C are presented for the Fe-H2O system. These have been constructed in the absence of some high-temperature thermodynamic data using the extrapolation method of Criss and Cobble combined with empirical relations for the 25°C entropy of ions. The salient change in the diagrams with increasing temperature is an expanded region of corrosion in high pH media resulting from the increasing stability of the ion HFeO2. This change is discussed in relation to (1) cathodic protection, which may become more difficult at higher temperatures and pH, and (2) caustic cracking of steel, which seems to occur where HFeO2−is stable.