金属材料在CO-H_2-H_2O合成气氛使用过程中会发生金属尘化腐蚀.运用化学热力学理论与计算方法对在CO-H_2-H_2O气氛下发生金属尘化腐蚀时的标准反应吉布斯函数进行计算,得到了气氛碳活度与温度的关系式.通过气氛碳活度与材料碳活度的比较,获得两种金属尘化类型.CO-H_2-H_2O气氛碳的化学势受温度、气氛组成、总压的影响,减少H_2O的含量,升高总压,会使发生金属尘化的温度范围扩大.
Metal dusting will occur on metallic materials in CO-H_2-H_2O synthetic atmosphere. The function rela-tionship between α_(C,gas) (carbon activity) and T (thermodynamics temperature) was deduced by calculating standard Gibbs free energy of CO-H_2-H_2O reaction in gas, utilizing the theory and method of chemical thermodynamics. Two types of metal dusting can be gained by comparing α_(C,gas), with α_(C,Fe_3 C/Fe),. The possible metal dusting occurrence depends on temperature, gas composition, and total pressure. Decreasing the content of H_2O and increasing total pressure extends the temperature range for metal dusting.
参考文献
| [1] | Hochman R F .Catastrophic Deterioration of High-Temperature Alloys in Carbonaceous Atmospheres[J].Journal of the Electrochemical Society,1977,77(01):715. |
| [2] | H. J. Grabke .Thermodynamics, mechanisms and kinetics of metal dusting[J].Materials and Corrosion,1998(5):303-308. |
| [3] | H. J. Grabke .Metal Dusting[J].Materials and Corrosion,2003(10):736-746. |
| [4] | R. Yin .Thermodynamic Aspects of Iron in Metal Dusting[J].Oxidation of Metals,2003(1/2):103-116. |
| [5] | R. Yin .Thermodynamic Roles of Metallic Elements in Carburization and Metal Dusting[J].Oxidation of Metals,2004(3/4):323-337. |
| [6] | 王福会.金属材料在高温含碳气氛中的腐蚀[J].腐蚀科学与防护技术,1996(04):296. |
| [7] | 韩光炜,冯涤,邓波,陈锐铭,李丁川.氧化膜对高温合金灰化抗力的影响[J].钢铁研究学报,2003(06):58-63. |
| [8] | 毕明树.工程热力学[M].北京:化学工业出版社,2001 |
| [9] | Shatynski S R .The Thermochemistry of Transition Metal Carbides[J].Oxidation of Metals,1979,13(02):105. |
| [10] | 陈成,周昌玉,胡桂明,雷娜.Cr5Mo钢在高温碳氢气氛下的尘化腐蚀试验研究[J].压力容器,2008(11):11-14. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%