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<p>This study investigates the simultaneous effects of brine temperature (35-55), coupon surface temperature (20-40&#xa0;°C), acetic acid (0-1000), and aqueous H<sub>2</sub>S (0-200&#xa0;ppm) on the top-of-the-line (TLC) and bottom-of-the-line (BLC) corrosion of API 5L X65 steel in CO<sub>2</sub>-saturated brine using a custom glass cell. Corrosion rates were measured using weight loss, linear polarization resistance and Tafel polarization, and corrosion products were characterized using XRD, SEM, and EDS. Results showed that BLC rates increased with brine temperature and acetic acid concentration but decreased with higher H<sub>2</sub>S due to FeS film formation. TLC rates were controlled by coupon surface temperature and CO<sub>2</sub>/H<sub>2</sub>S synergy, with up to a 1920% increase when the coupon temperature increased by 10&#xa0;°C in the presence of 200&#xa0;ppm H<sub>2</sub>S. The harsh TLC condition was set to a brine temperature of 40, a coupon surface temperature of 30&#xa0;°C, 600 acetic acid, and 150&#xa0;ppm H<sub>2</sub>S. Electrochemical and weight loss analyses yielded consistent results, confirming the reliability of the approach.</p>

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Simultaneous Effect of Temperature, Acetic Acid, and H2S on Top-of-the-Line Corrosion of API 5L X65 Steel

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Fatemeh Hassani,
  • Mehdi Javidi,
  • Bahareh Hoomehr,
  • Mohammad Amin Sadeghi,
  • Mohammad Mahdi Dana,
  • Sepideh Rajaei,
  • Mahna Soleymani

摘要

This study investigates the simultaneous effects of brine temperature (35-55), coupon surface temperature (20-40 °C), acetic acid (0-1000), and aqueous H2S (0-200 ppm) on the top-of-the-line (TLC) and bottom-of-the-line (BLC) corrosion of API 5L X65 steel in CO2-saturated brine using a custom glass cell. Corrosion rates were measured using weight loss, linear polarization resistance and Tafel polarization, and corrosion products were characterized using XRD, SEM, and EDS. Results showed that BLC rates increased with brine temperature and acetic acid concentration but decreased with higher H2S due to FeS film formation. TLC rates were controlled by coupon surface temperature and CO2/H2S synergy, with up to a 1920% increase when the coupon temperature increased by 10 °C in the presence of 200 ppm H2S. The harsh TLC condition was set to a brine temperature of 40, a coupon surface temperature of 30 °C, 600 acetic acid, and 150 ppm H2S. Electrochemical and weight loss analyses yielded consistent results, confirming the reliability of the approach.