| XIAO Ying,WANG Wenxiang,LIN Bing,YANG Guang,LIU Jianhui,LIU Minghua,LI Luling,XU Taolong,TANG Junlei.Effect of Hydrogen on Soil Corrosion Behavior of 20# Steel[J],54(10):96-104 |
| Effect of Hydrogen on Soil Corrosion Behavior of 20# Steel |
| Received:August 27, 2024 Revised:March 05, 2025 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.10.007 |
| KeyWord:20# steel hydrogen corrosion soil corrosion pitting corrosion corrosion mechanism corrosion products |
| Author | Institution |
| XIAO Ying |
Shenzhen Gas Corporation Ltd., Guangdong Shenzhen , China;School of Chemistry and Chemical Engineering,Chengdu , China |
| WANG Wenxiang |
Shenzhen Gas Corporation Ltd., Guangdong Shenzhen , China |
| LIN Bing |
School of Chemistry and Chemical Engineering,Chengdu , China |
| YANG Guang |
Shenzhen Gas Corporation Ltd., Guangdong Shenzhen , China |
| LIU Jianhui |
Shenzhen Gas Corporation Ltd., Guangdong Shenzhen , China |
| LIU Minghua |
School of Chemistry and Chemical Engineering,Chengdu , China |
| LI Luling |
Shenzhen Gas Corporation Ltd., Guangdong Shenzhen , China |
| XU Taolong |
Petroleum Engineering School, Southwest Petroleum University, Chengdu , China |
| TANG Junlei |
School of Chemistry and Chemical Engineering,Chengdu , China |
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| Abstract: |
| The work aims to study the corrosion behavior of hydrogen-containing 20# steel in soil simulation solution, explore the effect of hydrogen charging time on the surface corrosion morphology and corrosion products of 20# steel, and obtain the corrosion mechanism of hydrogen-containing 20# steel in soil simulation solution. Corrosion weight loss was used to analyze the corrosion rate of 20# steel under different hydrogen charging time. The electrochemical corrosion behavior of 20# steel under different hydrogen charging time was analyzed. The corrosion morphology and products on the surface of 20# steel under different hydrogen charging time were characterized by SEM for comparative analysis. At the same time, the composition of the corrosion products of 20# steel was obtained by combining EDS and Raman analysis tests. In the simulated soil solution, the self-corrosion potential and corrosion rate of 20# steel gradually increased with the increase of hydrogen charging time. In the initial stage of hydrogen charging, the corrosion rate of 20# steel increased significantly, and the hydrogen mainly adsorbed on the surface inclusions of the metal, promoting the increase of microcracks at the Al2O3 inclusions on the sample surface. Due to the different elastic moduli of inclusions and metal matrix, a large number of dislocations were generated around the inclusion interface, helping to adsorb hydrogen around the precipitates. The hydrogen was adsorbed around the precipitates, promoting the dissolution of metals around the precipitates. As the hydrogen charging time continued to increase, the hydrogen content in the sample continued to increase. When the hydrogen charging time was 24 hours, the corrosion rate of 20# steel tended to stabilize, indicating that the hydrogen content in the 20# steel sample gradually reached saturation. At this time, the percentage increase in the corrosion rate of 20# steel was 47.69% and there were a large number of yellow brown corrosion products and corrosion pits on the surface of the sample. The relationship between hydrogen charge time and corrosion rate was established, the model demonstrated that upon complete saturation of hydrogen adsorption sites in the steel matrix, the 20# steel exhibited a maximum corrosion rate of 0.141 6 mm/a, representing an 81.77% enhancement in corrosion degradation compared to non-hydrogen charging. A large amount of hydrogen was adsorbed and dissolved in the metal crystal phase and phase boundaries, promoting the occurrence and development of pitting corrosion. In addition, hydrogen promoted changes in the morphology and composition of localized corrosion products of 20# steel. SEM observations revealed that the 20# steel under non-hydrogen charging exhibited corrosion products with polygonal platelet morphologies. As the hydrogen charging time increased, the size of the polygonal flakes gradually increased. At the same time, a large amount of layered corrosion products accumulated locally and the corrosion products were loose and porous. The hydrogen increases hydroxide ion concentration in corrosion products and the formation of γ-FeOOH and β-FeOOH. In contrast to the FeOOH polymorphs, Fe2O3 exhibits enhanced protective properties on metallic substrates. The porous architecture characteristic of γ-FeOOH and β-FeOOH accelerates interfacial electrochemical kinetics within the corrosion product layer, thereby promoting pit initiation and propagation through enhanced ion transport pathways. |
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