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<p>The effects of different temperatures and freeze-thaw cycles on the corrosion behavior of N80-Q low alloy steel in CO<sub>2</sub>-saturated formation water are investigated by immersion tests and galvanic current monitoring. The corrosion rate is the lowest at − 20&#xa0;°C but higher under freeze-thaw cycles. However, N80-Q steel exhibits measurable galvanic current density at − 20&#xa0;°C in the formation water containing CO<sub>2</sub> environment. During the freezing stage, the frozen of water in the corrosion products expands and results in the cracks, accelerating the occurrence of localized corrosion. Interestingly, the thickness loss of N80-Q steel is correlated with the maximum pit depth and the average pit depth. The freeze-thaw cyclic process increases the pitting index and promotes the initiation and propagation of local corrosion towards the depth direction.</p>

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Corrosion Behavior and Corrosion Mechanism of N80-Q Low Alloy Steel in Water Containing CO2 under Freeze-Thaw Cycle

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Yongqiang Zhang,
  • Huiyun Tian,
  • Biao Zhao,
  • Kun Pang,
  • Zhenpeng Ma,
  • Zhongyu Cui

摘要

The effects of different temperatures and freeze-thaw cycles on the corrosion behavior of N80-Q low alloy steel in CO2-saturated formation water are investigated by immersion tests and galvanic current monitoring. The corrosion rate is the lowest at − 20 °C but higher under freeze-thaw cycles. However, N80-Q steel exhibits measurable galvanic current density at − 20 °C in the formation water containing CO2 environment. During the freezing stage, the frozen of water in the corrosion products expands and results in the cracks, accelerating the occurrence of localized corrosion. Interestingly, the thickness loss of N80-Q steel is correlated with the maximum pit depth and the average pit depth. The freeze-thaw cyclic process increases the pitting index and promotes the initiation and propagation of local corrosion towards the depth direction.