1. Inhibitory effect of La3+ on hydrogen damage of 27CrMo44S/1 steel in H2S-containing acidic solution
- Author
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Zhengyi Xu, Hao Liu, Donatien Ngendabanyikwa, Bing Lei, Zhiyuan Feng, Junyi Wang, Yawei Shao, Guozhe Meng, Yanqiu Wang, and Fuhui Wang
- Subjects
H2S ,Hydrogen permeation ,Hydrogen damage ,Inhibitory effect ,Mining engineering. Metallurgy ,TN1-997 - Abstract
The effect of La3+ on the hydrogen permeation behavior of 27CrMo44S/1 steel in acidic environments containing H2S is investigated through the measurement of steady-state permeation current density (i∞), hydrogen diffusivity (D), and subsurface hydrogen concentration (C0). Results indicate that the addition of La3+ can remarkably reduce i∞. The corrosion products with La3+ involved in the film formation process in the H2S-free environment have a good hydrogen barrier effect, but the addition of La3+ hardly influence the D value of 27CrMo44S/1 steel in the H2S-containing environment. However, the presence of La3+ substantially reduces the C0 on metal surface regardless of the presence of H2S in the solution. Static immersion and tensile experiments illustrate that the addition of La3+ can improve the corrosion resistence and plasticity loss of the material in the H2S environment.
- Published
- 2023
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