Comparison of hydrogen diffusivities measured by electrochemical permeation and temperature-programmed desorption in cold-rolled pure iron
Comparison of hydrogen diffusivities measured by electrochemical permeation and temperature-programmed desorption in cold-rolled pure iron
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冷轧纯铁中电化学渗透和程序升温脱附测量氢扩散率的比较
DOI：
10.1016/j.jngse.2021.104365
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发表时间：
2022
影响因子：
--
通讯作者：
Zafra A
中科院分区：
文献类型：
--
作者：
Zafra A
用渗析法和脱附法研究了氢在冷轧纯铁中的扩散系数。进行了电化学充电、电渗透和热脱附谱(TDS)实验。首先建立了充电电流与氢气浓度之间的关系。其次，在22℃、40℃和67℃下进行渗透实验，以量化扩散系数对温度的依赖关系。最后，利用两种类型的脱附实验和Fick定律估算了扩散系数：(I)‘静置时间’法，用来测量在室温下放置不同时间的样品的氢含量；(Ii)在22-80℃温度范围内的等温脱附实验，拟合出脱附速率与时间的曲线。等温解吸法和渗透法得到了很好的一致性，并对观察到的差异进行了讨论和合理化。此外，冷轧纯铁的扩散系数实测值也与文献报道的值相当。这项工作表明，等温脱附实验是一种在很宽的温度范围内测定氢扩散系数的方便方法，而新的TDS系统具有快速的升温速度。
The diffusivity of hydrogen in cold-rolled pure iron is investigated using permeation and desorption methods. Electrochemical charging, electro-permeation and thermal desorption spectroscopy (TDS) experiments are conducted. Firstly, the relation between the charging current and the hydrogen concentration is established. Secondly, permeation experiments are conducted at 22, 40 and 67 °C to quantify the diffusivity dependence on temperature. Finally, the diffusivity is estimated by using two types of desorption experiments and Fick’s law: (i) a ‘rest time’ method, by which we measure the hydrogen content of samples held at room temperature for different times, and (ii) isothermal desorption experiments at temperatures ranging from 22 to 80 °C, fitting the resulting desorption rate versus time curves. Good agreement is obtained between the isothermal desorption and permeation approaches, with observed differences discussed and rationalized. Moreover, measured diffusivity values for cold-rolled pure iron are also found to be comparable to those reported in the literature. This work demonstrates that isothermal desorption experiments are a convenient approach to determine hydrogen diffusivity over a wide range of temperatures, as facilitated by new TDS systems with fast heating rates.
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