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<p>Usage of carbon steel (CS) pipes for the transportation of gas at higher temperatures comprises inefficiency due to microstructural and phases changes. To ensure thermal efficiency, reduction of gas emission and better corrosion properties, this study investigated an application of novel nano-coating and ceramic blanket on CS pipe. On both bare and coated CS pipelines, ceramic blanked was relatively covered during gas exposure. After the experiment, three different sections of pipeline, including where failure occurred, were taken for characterization tests under optical microscopy (OPM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). Corrosion measurements were also carried out under mostly experienced electrolyte conditions CS pipes experience in transportation of the gas at higher temperatures. Different ruptures were experienced from a certain plateau temperatures: bare CS pipe showed highly aggravated surface at about 650&#xa0;°C and aggressively ruptured morphology was noted at 850&#xa0;°C. Contrarily, continuous corrosion products with minor defects was noted on coated specimen at 650&#xa0;°C, and the phase characterization revealed a formation of green rust products. Nonetheless, detrimental microstructural damage was seen at 850&#xa0;°C. In attest, corrosion measurements revealed active–passive behavior on coated CS, and the EIS analyses showed a relatively wider semi-circle from the coated CS pipe.</p>

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Corrosion Behavior of Carbon Steel Gas Pipe Exposed to CO2/Sulfide under High Temperature Applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Khotso Khoele,
  • David Jacobus Delport

摘要

Usage of carbon steel (CS) pipes for the transportation of gas at higher temperatures comprises inefficiency due to microstructural and phases changes. To ensure thermal efficiency, reduction of gas emission and better corrosion properties, this study investigated an application of novel nano-coating and ceramic blanket on CS pipe. On both bare and coated CS pipelines, ceramic blanked was relatively covered during gas exposure. After the experiment, three different sections of pipeline, including where failure occurred, were taken for characterization tests under optical microscopy (OPM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). Corrosion measurements were also carried out under mostly experienced electrolyte conditions CS pipes experience in transportation of the gas at higher temperatures. Different ruptures were experienced from a certain plateau temperatures: bare CS pipe showed highly aggravated surface at about 650 °C and aggressively ruptured morphology was noted at 850 °C. Contrarily, continuous corrosion products with minor defects was noted on coated specimen at 650 °C, and the phase characterization revealed a formation of green rust products. Nonetheless, detrimental microstructural damage was seen at 850 °C. In attest, corrosion measurements revealed active–passive behavior on coated CS, and the EIS analyses showed a relatively wider semi-circle from the coated CS pipe.