A Method for Measuring of Hydrogen Diffusion Coefficient of a Low Alloy Cast Steel for Train
摘 要
采用双电解池电化学氢渗透法测试氢在一种低合金铸钢中的扩散系数,并利用基于半无限扩散模型的氢渗透修正公式,分析试样厚度、充氢电流密度和测试温度等因素对氢扩散系数测定值的影响规律。结果表明:试样厚度对氢扩散系数测量值没有明显影响,不过从材料均匀性方面考虑,选取较厚的试样应获得更准确的测试值;充氢电流密度越大,表观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,其关系式为D=0.052 8 exp(-22.47/RT)。
Abstract
The method of electrochemical hydrogen permeation in a double electrolytic cell was applied to measure the diffusion coefficient of hydrogen in a low alloy cast steel. The modified hydrogen permeation formula based on semi-infinite diffusion model was applied to evaluate the effects of the thickness of testing specimen, the current of charging hydrogen and experimental temperature on the measured value. The results indicate that the thickness of experimental sample did not exert influence on the measured value of diffusion coefficient of hydrogen. However, from the viewpoint of homogeneity of the material, more accurate measured value would be obtained by measuring a thicker sample. the observed value was closer to the theoretical value with increasing the current density of charging hydrogen. Rising experimental temperature could increase the diffusion coefficient of hydrogen, D=0.052 8 exp (-22.47/RT).
中图分类号 TG111.6 DOI 10.11973/fsyfh-201705013
所属栏目 试验研究
基金项目 国家自然科学基金(51201144);中国博士后科学基金(2013M542288);四川省科技支撑计划项目(2016GZ0271)
收稿日期 2015/12/7
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引用该论文: LUO Xiaowei,ZHANG Kun,DONG Lixin,ZHAO Heming,WANG Hong,SHEN Xinjian,JING Liusheng. A Method for Measuring of Hydrogen Diffusion Coefficient of a Low Alloy Cast Steel for Train[J]. Corrosion & Protection, 2017, 38(5): 377
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【2】NISHIUE T,KANENO Y,INOUE H,et al. The effect of lattice defects on hydrogen thermal desorption of cathodically charged Co3Ti[J]. Intermetallics,2003(11):817-823.
【3】NISHIUE T,KANENO Y,INOUE H,et al. Hydrogen thermal desorption behavior of cathodically charged Ni(Si,Ti) alloys[J]. Journal of Alloys and Compounds,2004,364:214-220.
【4】崔国文. 缺陷、扩散与烧结[M]. 北京:清华大学出版社,1990:62-67.
【5】覃齐贤,刘淑兰. 电极的极化曲线(Ⅱ)-极化曲线[J]. 电镀与精饰,2008,30(7):29-34.
【6】TURNBULL A. Standardisation of hydrogen permeation measurement by the electrochemical technique[M]. Cambridge:The University Press,1995.
【7】LUU W C,KUO H S,WU J K. Hydrogen permeation through nickel-plated steel[J]. Corrosion Science,1997,39(6):1051-1059.
【8】LI X. Diffusion of hydrogen in thick clean steel and effect of hydrogen on mechanical porperties[D]. Shanghai:Shanghai University,2013.
【9】DEVANATHAN M,STACHURSKI Z. The adsorption and diffusion of electrocity hydrogen in palladium[J]. Mathematical and Physical Science,1962,270(1340):90-102.
【10】李勇峰. 氢在钢中的渗透特性及镀层阻氢渗透机理的研究[D]. 上海:华东理工大学,2010:4-5.
【11】陈业新,常庆刚. 20 g纯净钢中氢陷阱对氢扩散系数的作用[J]. 金属学报,2011,47(5):548-552.
【12】陈业新,常庆刚. 氢在20 g纯净钢中的扩散研究[J]. 上海金属,2010,32(6):35-38.
【13】PREOUYRE G M. Hydrogen traps,repellers,and obstacles in steel;consequences on hydrogen diffusion,solubility,and embrittlement[J]. Metallurgical transactions A,1983,14A(10):2189-2193.
【14】褚武扬. 断裂与环境断裂[M]. 北京:科学出版社,2000:97-104.
【15】郭望,赵卫民,张体明,等. 阴极极化和应力耦合作用下X80钢氢渗透行为研究[J]. 中国腐蚀与防护学报,2015,35(4):353-358.
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