阴极极化和应力耦合作用下X80钢氢渗透行为研究

doi:10.11902/1005.4537.2014.155

中国腐蚀与防护学报

2015, Vol. 35

Issue (4): 353-358 DOI: 10.11902/1005.4537.2014.155

本期目录 | 过刊浏览

阴极极化和应力耦合作用下X80钢氢渗透行为研究

郭望,赵卫民(

),张体明,杜天海,王勇

Hydrogen Permeation Behavior of X80 Steel under Cathodic Polarization and Stress

Wang GUO,Weimin ZHAO(

),Timing ZHANG,Tianhai DU,Yong WANG

School of Mechanical and Electrical Engineering, China University of Petroleum, Qingdao 266580, China

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摘要:

采用改进的D-S双电解池与慢应变速率拉伸实验机相结合,研究了阴极保护和应力耦合作用下X80钢在3.5%NaCl+1 g/L Na₂S溶液中的氢渗透行为。通过变电位氢渗透实验,分析极化电位对氢渗透行为的影响并得到析氢敏感电位。进行不同应力水平下的恒电位极化氢渗透实验,采用Laplace方程分析氢渗透曲线,计算相关的氢渗透参数。结果表明,在各个应力水平下,随阴极极化电位负移,稳态渗氢电流密度增大,析氢敏感电位负于-1000 mV (vs SCE)。在弹性应变时,氢陷阱密度变小,氢扩散系数增大；进入塑性变形阶段后由于位错产生,氢陷阱密度逐渐升高,氢扩散系数降低；吸附氢浓度与扩散系数呈现相反的变化规律。

关键词 ：阴极极化, X80钢, 氢渗透, 应力

Abstract：

Hydrogen permeation behavior of X80 steel under applied cathodic polarization and stress in 3.5%NaCl+1 g/L Na₂S solution was studied by means of a modified D-S cell combined with slow strain rate tensile machine. The effect of polarization potential on hydrogen permeation behavior and the hydrogen evolution potential were acquired by hydrogen permeation test with changing polarization potential. Besides, potentiostatic polarization hydrogen permeation test under different stress levels was performed and then the hydrogen permeation parameters were calculated by the Laplace equation. Results show that under various stress levels, the steady-state hydrogen permeation current density increased as the cathodic polarization potential decreased, and the hydrogen evolution potential was lower than -1000 mV (vs SCE). In the stage of elastic strain, hydrogen trap density decreased and the apparent hydrogen diffusion coefficient increased. After entering the stage of plastic deformation, hydrogen trap density increased and the hydrogen diffusion coefficient gradually decreased due to the generation of dislocation. The concentration of adsorbed hydrogen shows a change tendency opposite to the hydrogen diffusivities.

Key words： cathodic polarization X80 steel hydrogen permeation stress

基金资助:山东省自然科学基金项目 (ZR2013EEL023) 和中央高校基本科研业务费专项资金项目 (14CX05020A) 资助

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引用本文:

郭望,赵卫民,张体明,杜天海,王勇. 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.
Wang GUO, Weimin ZHAO, Timing ZHANG, Tianhai DU, Yong WANG. Hydrogen Permeation Behavior of X80 Steel under Cathodic Polarization and Stress. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 353-358.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.155 或 https://www.jcscp.org/CN/Y2015/V35/I4/353

图1 X80钢的显微组织

图2 氢渗透实验装置

图3 X80钢在3.5%NaCl+1 g/L Na2S水溶液中的阴极极化曲线

图4 不同应力水平下X80钢的变电位氢渗透曲线

图5 不同应力水平下X80钢在-1100 mV阴极极化时的氢渗透曲线

表1 不同应力水平下X80钢在-1100 mV极化时的氢渗透参数

图6 不同应力水平下X80钢的Da-1000/tp关系曲线

图7 不同应力水平下X80钢的氢陷阱密度

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