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<p>While Alloy 825 is valued for its corrosion resistance in oil and gas fields, this alloy remains vulnerable to pitting corrosion in high-temperature, high-pressure environments. In this study, a finite element model was developed to predict pit growth by coupling mass transport, electrochemical reactions, and interface evolution. The model explicitly examined the effects of temperature, H<sub>2</sub>S and CO<sub>2</sub> on pitting behavior of Alloy 825. Validation against experimental data confirmed the accuracy of this model in prediction of the depth of pits. It was revealed that elevated temperatures intensified the current density for metal dissolution, even though the H<sup>+</sup> ion concentration decreased due to the decrease in the solubility of CO<sub>2</sub>. Trace H<sub>2</sub>S significantly promoted pitting corrosion, whereas the acceleration of pit growth was weakened under high CO<sub>2</sub> partial pressures due to the buffering effect of CO<sub>2</sub>. This computational approach may provide valuable insights for predicting pitting corrosion of corrosion-resisting alloys in oil and gas fields.</p>

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Simulation of Pit Growth Behavior of Nickel-Based Alloy 825 in High-Temperature and High-Pressure CO2 Environments

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Wendi Fu,
  • Dong Lin,
  • Mingnan Sun,
  • Chang Liu,
  • Lijin Dong,
  • Xinyi Wang,
  • Jian Zhang,
  • Zejun Wan

摘要

While Alloy 825 is valued for its corrosion resistance in oil and gas fields, this alloy remains vulnerable to pitting corrosion in high-temperature, high-pressure environments. In this study, a finite element model was developed to predict pit growth by coupling mass transport, electrochemical reactions, and interface evolution. The model explicitly examined the effects of temperature, H2S and CO2 on pitting behavior of Alloy 825. Validation against experimental data confirmed the accuracy of this model in prediction of the depth of pits. It was revealed that elevated temperatures intensified the current density for metal dissolution, even though the H+ ion concentration decreased due to the decrease in the solubility of CO2. Trace H2S significantly promoted pitting corrosion, whereas the acceleration of pit growth was weakened under high CO2 partial pressures due to the buffering effect of CO2. This computational approach may provide valuable insights for predicting pitting corrosion of corrosion-resisting alloys in oil and gas fields.