Corrosion protection characteristics of doped magnetite layers on carbon steel surfaces in aqueous CO2 environments

IF 4.8 Q2 ENERGY & FUELS Journal of Pipeline Science and Engineering Pub Date : 2024-06-16 DOI:10.1016/j.jpse.2024.100199

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Abstract

Magnetite (Fe₃O₄) corrosion product surface layers can limit uniform corrosion rates of carbon steel in aqueous carbon dioxide (CO₂)-saturated environments. However, as Fe₃O₄ is a semiconductor, localised corrosion can proceed due to galvanic interaction between the Fe₃O₄ layers and bare steel. In this study, metal dopants were integrated into Fe₃O₄ layers to mitigate the effects of localised corrosion, whilst maintaining its protective barrier properties. Model Fe₃O₄ and metal-doped Fe₃O₄ layers were electrodeposited on carbon steel and immersed in a pH 5, 1 wt% sodium chloride (NaCl), CO₂-saturated, 50 °C solution. Under the conditions studied, the incorporation of magnesium into the Fe₃O₄ layer resulted in reduced localised corrosion when the 3D surface profiles of the underlying carbon steel were measured using white light interferometry.

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二氧化碳水环境中碳钢表面掺杂磁铁矿层的腐蚀防护特性

磁铁矿（Fe3O4）腐蚀产物表层可以限制碳钢在二氧化碳（CO2）饱和水环境中的均匀腐蚀率。然而，由于 Fe3O4 是一种半导体，Fe3O4 层与裸钢之间的电化作用会导致局部腐蚀。在这项研究中，金属掺杂物被整合到了 Fe3O4 层中，以减轻局部腐蚀的影响，同时保持其保护屏障特性。模型 Fe3O4 和金属掺杂 Fe3O4 层被电沉积在碳钢上，并浸入 pH 值为 5、氯化钠（NaCl）含量为 1 wt%、二氧化碳饱和、温度为 50 °C 的溶液中。在所研究的条件下，使用白光干涉仪测量下层碳钢的三维表面轮廓时，将镁掺入 Fe3O4 层可减少局部腐蚀。

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