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王霞,周雯洁,侯铎,蒋欢,侯丽.氢对酸性气田低合金钢氢渗透及应力腐蚀行为的影响[J].稀有金属材料与工程(英文),2020,49(11):3734~3740.[Wang Xia,Zhou Wenjie,Hou Duo,Jiang Huan and Hou Li.Effect of Hydrogen on Hydrogen Permeation and Stress Corrosion Behavior of Low Alloy Steel in Acid Gas Field[J].Rare Metal Materials and Engineering,2020,49(11):3734~3740.]
Effect of Hydrogen on Hydrogen Permeation and Stress Corrosion Behavior of Low Alloy Steel in Acid Gas Field
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Received:October 24, 2019  Revised:December 30, 2019
DOI:
Key words: 80SS low-alloy steel  Hydrogen permeation  Slow strain stretching  Pre-charged hydrogen  Stress corrosion sensitivity  SEM
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Wang Xia,Zhou Wenjie,Hou Duo,Jiang Huan and Hou Li  
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Abstract:
      In this study, the effects of hydrogen concentration on hydrogen permeation and stress corrosion cracking behavior in 80SS low-alloy tubing steels in a saturated CO2 simulated produced water environment was explored by electrochemical hydrogen permeation, slow strain rate tension and stereo microscope, SEM methods. The results show that the acidity and the hydrogen permeation parameters i^∞, D and C_0^H were both increasing with the raise of the concentration of H+, which contributes to the diffusion behavior of hydrogen atoms. Since the synergistic effect of tensile stress and hydrogen atom, the fracture time of 80SS low alloy steel is reduced by nearly 50% compared with the tensile in air, and the change is occurred to ductile fracture to brittle fracture. As the hydrogen concentration of the solution increases, the mechanical damage of the steel and the stress corrosion sensitivity strengthen. Before and after pre-charged hydrogen the index Iδ changed from 3.16 to 8.49 when 80SS steel is stretched in a medium containing saturated CO2. Pre-charged hydrogen promoted the stress corrosion cracking sensitivity of the sample. When stretched in saturated CO2 produced water containing 1% HAc, the microscopic morphology before pre-charged hydrogen showed a river pattern with quasi-cleavage fracture characteristics. Discontinuous cracks and small pores are distributed with fiber area of 80SS steel of the pre-charged hydrogen. Compared with before pre-charged sample, pre-charged hydrogen improved the plastic properties of the steel and reduced the stress corrosion cracking sensitivity of the steel.