升温条件下Zr-H_2O系电位-pH平衡图  

Potential-pH Diagrams of Zr-H_2O System at the Increased Temperatures

作　　者：陈小文[1] 白新德[1] 邓平晔[1] 彭德全[1] 刘晓阳[1] 

机构地区：[1]清华大学,北京100084

出　　处：《稀有金属材料与工程》2004年第7期710-713,共4页Rare Metal Materials and Engineering

基　　金："973"资助课题(G2000067207);清华大学"985"课题;清华大学开放实验室资助项目

摘　　要：通过热力学计算,绘制了298K温度条件下Zr-H2O系电位-pH平衡图及升温条件(333,373,423K)下Zr-H2O系电位-pH平衡图。所绘制的298K温度下Zr-H2O系电位-pH平衡图与M.Pourbaix绘制的相同温度条件下Zr-H2O系电位-pH平衡图很好地吻合。比较分析不同温度条件下Zr-H2O系电位-pH平衡图发现,随着温度的升高,锆金属的免蚀区变化不大,而钝化区则明显缩小。从理论上说明了锆金属用于高温条件的局限性。The Potential-pH diagrams of the Zr-H2O system at temperatures of 298 K, 333 K, 373 K and 423 K were be established through extensive study of thermodynamic data and thermodynamic calculation coupled with experimental results? The Potential-pH diagram at 298 K concides with that at the same temperature drawn by Professor M.Pourbaix. Comparing and analyzing potential-pH diagrams of Zr-H2O system at different temperatures, it is evident that with the temperature increasing there is no great change of the immunity area of zirconium, but remarkable reduction of the passivation area, which theoretically accounts for the high temperature limitation of zirconium.

关 键 词：Zr-H2O系 热力学计算 电位-pH平衡图 

分 类 号：TG113[金属学及工艺—物理冶金]