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<p>This study, by using flow loop tests, investigated the erosion–corrosion behavior of carbon steel under conditions of extremely high flow velocity and elevated wall shear stress. The study demonstrated that wall shear stress and water content are the key parameters affecting the erosion–corrosion behavior of carbon steel. The corrosion rate of carbon steel increased with wall shear stress and water content. High wall shear stress disrupted the protective FeCO<sub>3</sub> scales. When the wall shear stress reaches 212&#xa0;Pa, the corrosion rate of carbon steel can reach 10.65&#xa0;mm/y. In high-velocity CO<sub>2</sub> wet gas pipelines, salt deposition (NaCl and CaCO<sub>3</sub>) occurs even under conditions of low water content and minimal medium salinity. This deposition significantly lowers the erosion–corrosion rate. Furthermore, high wall shear stress can degrade corrosion inhibitor films, but continuous injection maintains their protective effect because of the higher mass transfer rate of inhibitors under high flow velocities, emphasizing the necessity of continuous injection. Even at a wall shear stress of 106&#xa0;Pa. the corrosion inhibition efficiency can approach 90% after adding 1000&#xa0;ppm of the imidazoline-type corrosion inhibitor.</p>

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Corrosion and Inhibitor Adsorption Behavior of Carbon Steel in an Ultra High-Flow-Velocity Wet Gas Environment Using a Flow Loop System

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Bei Wang,
  • Yongfei Liu,
  • Haiyuan Yao,
  • Dan Li,
  • Yingfeng Chen,
  • Xiuyun Wang,
  • Minxu Lu

摘要

This study, by using flow loop tests, investigated the erosion–corrosion behavior of carbon steel under conditions of extremely high flow velocity and elevated wall shear stress. The study demonstrated that wall shear stress and water content are the key parameters affecting the erosion–corrosion behavior of carbon steel. The corrosion rate of carbon steel increased with wall shear stress and water content. High wall shear stress disrupted the protective FeCO3 scales. When the wall shear stress reaches 212 Pa, the corrosion rate of carbon steel can reach 10.65 mm/y. In high-velocity CO2 wet gas pipelines, salt deposition (NaCl and CaCO3) occurs even under conditions of low water content and minimal medium salinity. This deposition significantly lowers the erosion–corrosion rate. Furthermore, high wall shear stress can degrade corrosion inhibitor films, but continuous injection maintains their protective effect because of the higher mass transfer rate of inhibitors under high flow velocities, emphasizing the necessity of continuous injection. Even at a wall shear stress of 106 Pa. the corrosion inhibition efficiency can approach 90% after adding 1000 ppm of the imidazoline-type corrosion inhibitor.