Time-Dependent Measurement of Hydrogen Penetration into Iron Sheets from a Borate Buffer Solution Using FFT Analysis
Time-Dependent Measurement of Hydrogen Penetration into Iron Sheets from a Borate Buffer Solution Using FFT Analysis
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使用 FFT 分析随时间测量硼酸盐缓冲溶液中氢渗透到铁片中的情况
DOI：
10.1149/2.0811813jes
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发表时间：
2018
影响因子：
3.9
通讯作者：
Fushimi Koji
中科院分区：
文献类型：
--
作者：
Yamamoto Yudai;Kitagawa Yuichi;Hasegawa Yasuchika;Fushimi Koji
采用改进的Devanathan-Stachurski流动池研究了pH 8.4的硼酸盐缓冲溶液中的氢渗透。一个正弦微扰法被施加到评估氢扩散系数D和它的试样厚度，极化电位，和电解液流量的依赖。采用快速傅里叶变换（FFT）技术实现了扩散系数的自动推导，具有精确性和快速筛选实验条件。所获得的D值随着试样厚度的增加或随着析氢反应的过电位的增加而增加，这表明在氢进入侧上的表面阻挡层状氧化物膜的效果。另一方面，D不依赖于入口侧电池中的电解质流速。从氢渗透的角度来看，阻挡层的性能几乎不受流量的影响，但它受到极化电位的影响。正弦微扰法结合FFT允许随时间变化的试样中的氢渗透行为的时间依赖性的评估，如氧化膜的形成和腐蚀。
Hydrogen penetration into iron sheets from a borate buffer solution (pH 8.4) was investigated using a modified Devanathan-Stachurski cell with flow paths. A sinusoidal perturbation method was applied to evaluate the hydrogen-diffusion coefficient D and its dependence on specimen thickness, polarization potential, and electrolyte flow rate. A fast Fourier transform (FFT) technique was employed to achieve automated derivation of the diffusion coefficient with precision and rapid screening of the experimental conditions. The obtained value of D increased with an increase in the specimen thickness or with an increase in the overpotential of the hydrogen evolution reaction, indicating the effect of a surface barrier layer-like oxide film on the hydrogen-entry side. On the other hand, D is not dependent on the electrolyte flow rate in the entry-side cell. From the viewpoint of hydrogen penetration, the properties of the barrier layer are almost immune to the flow rate, though it is affected by the polarization potential. The sinusoidal perturbation method combined with FFT allows the time-dependent evaluation of the hydrogen-penetration behavior in specimens with temporal changes, such as oxide-film formation and corrosion.