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<p>Herein, a comprehensive suite of electrochemical methods, including cyclic polarization, Mott-Schottky (M-S), and electrochemical impedance spectroscopy (EIS) tests, were employed to investigate the effects of O<sub>2</sub> on passivation and pitting behavior of Super 13Cr in CO<sub>2</sub>-saturated environment. Our findings reveal that O<sub>2</sub> plays a dual role: O<sub>2</sub> substantially enhances the stability of passive film by diminishing point defeat density, thereby improving the resistance to local corrosive attacks. Conversely, within the stable pitting domain, O<sub>2</sub> exacerbates the severity of the corrosive environment, undermining the repassivation capabilities of super 13Cr stainless steel. The study elucidates the intricate interplay of O<sub>2</sub> and the passive film, offering valuable insights for the strategic application of Super 13Cr in the demanding conditions of modern oil and gas extraction processes where CO<sub>2</sub> and O<sub>2</sub> coexist.</p>

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Double effects of O2 on passive film of super 13Cr stainless steel in CO2 saturated environment

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月6日

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  • Lv Naixin,
  • Fu Anqing,
  • Yu Haitao,
  • Zhang Gang,
  • Wei Chenghua,
  • Wang Xia,
  • Xu Zhengyi,
  • Wang Yanqiu

摘要

Herein, a comprehensive suite of electrochemical methods, including cyclic polarization, Mott-Schottky (M-S), and electrochemical impedance spectroscopy (EIS) tests, were employed to investigate the effects of O2 on passivation and pitting behavior of Super 13Cr in CO2-saturated environment. Our findings reveal that O2 plays a dual role: O2 substantially enhances the stability of passive film by diminishing point defeat density, thereby improving the resistance to local corrosive attacks. Conversely, within the stable pitting domain, O2 exacerbates the severity of the corrosive environment, undermining the repassivation capabilities of super 13Cr stainless steel. The study elucidates the intricate interplay of O2 and the passive film, offering valuable insights for the strategic application of Super 13Cr in the demanding conditions of modern oil and gas extraction processes where CO2 and O2 coexist.