Effects of La3+ on the hydrogen permeation and evolution kinetics in X70 pipeline steel

IF 4.8 Q2 ENERGY & FUELS Journal of Pipeline Science and Engineering Pub Date : 2023-06-01 DOI:10.1016/j.jpse.2022.100107

Zhengyi Xu , Pengyuan Zhang , Bo Zhang , Bing Lei , Zhiyuan Feng , Junyi Wang , Yawei Shao , Guozhe Meng , Yanqiu Wang , Fuhui Wang

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引用次数: 2

Abstract

The inhibitory effect of La³⁺ on the hydrogen permeation of X70 pipeline steel was investigated via steady-state hydrogen permeation current (i_∞) through electrochemical hydrogen permeation tests. The experimental permeation data were fitted with a constant concentration model and Electrochemical Impedance Spectroscopy (EIS) tests were conducted to characterize the activity of Hydrogen Evolution Reaction (HER) after the optimization of electrochemically active surface area. Additionally, the kinetics of HER and the adsorption/desorption process is calculated by Iyer-Pickering-Zamanzadeh (IPZ) and surface effect models, of which the results demonstrate that the La³⁺ in the corrosion products could effectively reduce the rate of Volmer reaction and hydrogen adsorption process, and accelerate the process of hydrogen atom desorption, thus leading to the remarkable decrease in C₀.

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La3+对X70管线钢氢渗透演化动力学的影响

通过电化学氢渗透试验，通过稳态氢渗透电流（i∞）研究了La3+对X70管线钢氢渗透的抑制作用。实验渗透数据用恒定浓度模型拟合，并进行电化学阻抗谱（EIS）测试来表征电化学活性表面积优化后的析氢反应（HER）活性。此外，通过Iyer-Pickering-Zamanzadeh（IPZ）和表面效应模型计算了HER和吸附/解吸过程的动力学，结果表明，腐蚀产物中的La3+可以有效降低Volmer反应和氢吸附过程的速率，加速氢原子的解吸过程，从而导致C0的显著降低。

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来源期刊

Journal of Pipeline Science and Engineering

CiteScore

7.50

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0.00%

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