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<p>This study systematically investigates the corrosion behavior of X80 pipeline steel in three simulated soil solutions (CS, SY, and TJ) utilizing weight loss measurements, electrochemical tests, and slow strain rate testing (SSRT). The results indicate that the corrosion rate decreases with immersion time in all solutions. The TJ solution exhibited the lowest corrosion rate of 1.96&#xa0;mm/y, while the SY solution showed the highest rate at 2.86 mm/y. In the TJ solutions, the development of a protective corrosion product layer contributed to corrosion mitigation. This was supported by electrochemical data showing an increase in charge transfer resistance from 3109 to 4378 Ω·cm<sup>2</sup>, which signifies the weakest electrochemical corrosion activity. SSRT results indicated an increased stress corrosion susceptibility in all solutions. After 28&#xa0;days of immersion, the elongation after fracture measured in the TJ simulated soil solutions reached 8.83%, higher than that in CS (7.46%) and SY (7.47%) solutions. The corresponding stress corrosion sensitivity index was the lowest (13.10%) in the TJ solution, indicating the least susceptibility to stress corrosion cracking. SEM analysis showed that extended immersion periods, under the combined influence of mechanical stress and corrosion, prompted a fracture mode transition from ductile to brittle fracture. This study provides valuable insights into the corrosion failure mechanisms of X80 pipeline steel under varied soil environments.</p>

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Study on the Corrosion Failure Behavior of X80 Pipeline Steel in Simulated Soil Solutions

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Haoping Peng,
  • Zhilong Zhang,
  • Changjun Wu,
  • Jianhua Wang,
  • Xuping Su,
  • Yonggang Zhao,
  • Zhiwei Li,
  • Shouwu Xu

摘要

This study systematically investigates the corrosion behavior of X80 pipeline steel in three simulated soil solutions (CS, SY, and TJ) utilizing weight loss measurements, electrochemical tests, and slow strain rate testing (SSRT). The results indicate that the corrosion rate decreases with immersion time in all solutions. The TJ solution exhibited the lowest corrosion rate of 1.96 mm/y, while the SY solution showed the highest rate at 2.86 mm/y. In the TJ solutions, the development of a protective corrosion product layer contributed to corrosion mitigation. This was supported by electrochemical data showing an increase in charge transfer resistance from 3109 to 4378 Ω·cm2, which signifies the weakest electrochemical corrosion activity. SSRT results indicated an increased stress corrosion susceptibility in all solutions. After 28 days of immersion, the elongation after fracture measured in the TJ simulated soil solutions reached 8.83%, higher than that in CS (7.46%) and SY (7.47%) solutions. The corresponding stress corrosion sensitivity index was the lowest (13.10%) in the TJ solution, indicating the least susceptibility to stress corrosion cracking. SEM analysis showed that extended immersion periods, under the combined influence of mechanical stress and corrosion, prompted a fracture mode transition from ductile to brittle fracture. This study provides valuable insights into the corrosion failure mechanisms of X80 pipeline steel under varied soil environments.