氢在低碳钢中的渗透扩散特性  

Diffusion Characteristics of Hydrogen in Low Carbon Steel

作　　者：李勇峰[1] 蔡丽安[2] 阚文彬[1] 朱合范[1] 潘红良[1] 

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]上海师范大学信息与机电学院,上海200234

出　　处：《华东理工大学学报（自然科学版）》2013年第2期222-227,共6页Journal of East China University of Science and Technology

基　　金：国家自然科学基金项目(50875084);上海师范大学一般科研项目(SK201224)

摘　　要：通过氢扩散理论拟合方法和时间滞后法评估了氢在低碳钢中的有效扩散系数,通过对部分衰减和积聚渗透瞬态曲线的拟合对氢在低碳钢中的扩散系数和浓度分布进行了分析。利用阳极侧完整的电流密度衰减曲线,对在阳极侧释放的可逆捕捉氢进行了表征。实验结果表明:低碳钢中的部分可逆氢可以通过阳极侧完整的电流密度衰减曲线进行表征。低碳钢中的氢陷阱以及充氢侧的浓度减缓了氢在材料中的扩散,降低了氢在材料中的扩散系数。而通过部分衰减和积聚渗透瞬态曲线的拟合较好地得到了氢在低碳钢中的实际扩散系数和浓度分布。The effective diffusion coefficient of hydrogen in the low carbon steel was determined by means of hydrogen diffusion theory fitting method and the time lag method. The diffusion coefficient and the concentration distribution of hydrogen in the low carbon steel were analyzed by the partial decay and build-up transients fitting. The complete current density decay can be used to determine the reversibly trapped hydrogen which was released from the anodic side of the specimens. The results indicated that part of the reversible hydrogen in the low carbon steel could be characterized by the complete current density decay at the membrane exit side. The diffusion of hydrogen in the low carbon steel was retarded and the diffusion coefficient was reduced because of the hydrogen trapping in the low carbon steel and slow surface processes on the entry side. The real diffusion coefficient and the concentration distribution of hydrogen in the low carbon steel were obtained by the partial decay and build-up transients fitting.

关 键 词：氢扩散 扩散系数 低碳钢 电化学氢渗透 氢陷阱 

分 类 号：TG174[金属学及工艺—金属表面处理]