硫化氢环境下氢扩散的影响因素  

Influencing factors of hydrogen diffusion in hydrogen sulfide environment

作　　者：李明[1] 李晓刚[1] 陈钢[2] 刘智勇[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国特种设备检测研究中心,北京100013

出　　处：《北京科技大学学报》2007年第1期39-44,共6页Journal of University of Science and Technology Beijing

基　　金：中国石油化工集团公司资助项目(No.301033);国家重点基础研究发展规划资助项目(No.G19990650)

摘　　要：采用典型的电化学渗氢装置,对材料的化学成分、焊接和环境中CO2和NH4+的质量浓度、溶液的pH值对硫化氢应力腐蚀开裂中氢扩散行为的影响进行了研究.结果表明:金属中夹杂物数量、焊缝金属中空位和焊接缺陷使得氢扩散系数增加;在硫化氢环境中,氢扩散稳态电流随pH值的增加而降低,随着NH4+的质量浓度的增加而增加,且增加幅度随着pH值的增加而加大;CO2的质量浓度对氢稳态扩散电流的影响是随着pH值的变化而起着不同的作用,在低pH值条件下氢稳态扩散电流随着CO2的质量浓度增加而增加,在较高的pH值中氢稳态扩散电流随着CO2的质量浓度增加而减小.Hydrogen permeation tests in a classical permeation cell, where a steel membrane is separating two electrolytic solutions, were used to characterize the effects of pH value, NH4^＋ and CO2 on the corrosion process of steels in H2S solutions. The results show that the detection of hydrogen diffusion through the steels is totally controlled by inclusions in metals and vacancies and defects produced in the process of welding. The steady state permeation current decreases with increasing pH value and increases with the concentration of aggressive NH4^＋ increasing. But the influence of CO2 on the steady state permeation current is related to the pH value of solutions.

关 键 词：锰钢 硫化氢应力腐蚀开裂 应力腐蚀 氢扩散 PH值 浓度 

分 类 号：TG178[金属学及工艺—金属表面处理]