一种临氢钢的氢扩散系数测定  

Measurement of Diffusion Coefficient of Hydrogen in an Anti-Hydrogen Steel

作　　者：赵和明[1] 王洪[1] 张鲲[2] 骆晓伟 胡书春[2] 陈晓浪[2] 杜怀明[3] 

机构地区：[1]新余钢铁集团有限公司,江西新余338001 [2]西南交通大学材料科学与工程学院,四川成都610031 [3]四川理工学院材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《材料保护》2016年第12期78-83,共6页Materials Protection

基　　金：国家自然科学基金项目(51201144);中国博士后科学基金项目(2013M542288);四川省科技支撑计划项目(2016GZ0271);材料腐蚀与防护四川省重点实验室开放基金项目(2016CL07)资助

摘　　要：研究氢在临氢钢中的扩散行为有助于准确评估该材料在临氢环境中的服役寿命。采用双电解池电化学氢渗透法测试了氢在临氢钢中的扩散系数D,并利用基于半无限扩散模型的氢渗透修正公式,分析了试样厚度、充氢电流密度和测试温度等因素对氢渗透率测定值的影响规律。结果表明:氢陷阱会降低氢扩散系数,试样厚度对氢扩散系数测量值没有明显影响,充氢电流密度越大,表征氢扩散系数与理论值越接近,氢扩散系数随测试温度升高而增大,D=0.044 5exp[-25 230/(RT)]。Method of electrochemical hydrogen permeation in a double electrolytic cell was applied in this study to measure the diffusion coefficient D of hydrogen in the steel.The modified hydrogen permeation formula based on semi-infinite diffusion model was applied to evaluate the effects of thickness of testing specimen,current of charging hydrogen and experimental temperature on the measured value of hydrogen permeation.Results indicated that hydrogen traps reduced the diffusion coefficient of hydrogen.The thickness of the sample did not exert influence on the measured value of hydrogen diffusion coefficient.The observed value was closer to its theoretical value with increasing current density of charging hydrogen.Rising experimental temperature increased the diffusion coefficient of hydrogen,D=0.004 5exp[-25 230/(RT)].

关 键 词：临氢钢 氢陷阱 氢扩散系数 电化学氢渗透 

分 类 号：TG142.1[一般工业技术—材料科学与工程]