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Construction and Verification of Pourbaix Diagrams for CO_2 Corrosion of Mild Steel Valid up to 250°C

机译：有效温度高达250°C的低碳钢的CO_2腐蚀Pourbaix图的构建和验证

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The Pourbaix diagrams for an Fe-CO_2-H_2O system at elevated temperatures were constructed using thermodynamic theory and data and then correlated with observed CO_2 corrosion phenomena of mild steel up to 250°C. In the range 80-150°C corrosion product layer formed and the surface analysis showed a mixture of crystal morphologies on the steel surfaces, for experiments lasting 4 days. Kinetic studies conducted at 120°C show full transformation from plate-like to oblong prismatic crystals over 30 days. No obvious crystal morphology was identified on the surfaces of samples studied at 200°C and 250°C. XRD analysis indicates that FeCO_3 and Fe_2(OH)_2CO_3 formed on the steel surface at 80-150°C. At 200-250°C, the corrosion product was exclusively Fe_3O_4. With surface pH consideration, the generated Pourbaix diagrams were validated by the experimental results. Maximum weight loss corrosion rates were observed at 120°C.
机译：使用热力学理论和数据构建升高温度下的Fe-Co_2-H_2O系统的POPAIX图，然后与低至250°C的低碳钢观察的CO_2腐蚀现象相关。在80-150°C的范围内，形成腐蚀产物层并且表面分析显示钢表面上的晶体形态的混合物，用于持续4天的实验。在120°C下进行的动力学研究显示出从平板上的完全转变为30天内的板状棱镜晶体。在200℃和250℃的样品表面上鉴定出明显的晶体形态。 XRD分析表明，在80-150°C的钢表面上形成的FECO_3和FE_2（OH）_2CO_3。在200-250°C时，腐蚀产品仅为FE_3O_4。通过表面pH考虑，通过实验结果验证了所生成的pourbaix图。在120℃下观察到最大减值腐蚀速率。

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