S355MC钢在粗甘油中的耐腐蚀性

M. Palcut, Ž. Gerhátová, Patrik Šulhánek, Peter Gogola
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摘要

腐蚀是材料在氧化环境中的降解。在水溶液中,它是由金属材料与周围电解质的表面反应引起的。有机化合物的存在可以大大降低金属的腐蚀速度。粗甘油是生物柴油、肥皂和脂肪酸生产的有机副产品。它通过酯交换反应大量产生。粗甘油含有多种杂质,经济价值较低。它在环境中的处置是不需要的,需要探索潜在的应用。本文首次对钢在粗甘油中的腐蚀进行了研究。采用电化学方法研究了低合金结构钢S355MC在未纯化粗甘油中的腐蚀行为。结果与自来水的使用进行了比较。与自来水相比,粗甘油中S355MC的开路电位(OCP)更为负。随着时间的推移,OCP是稳定的,表明钢基体的快速钝化。通过电极极化进一步研究了其耐腐蚀性能。在S355MC在粗甘油中的极化曲线上,发现了一个较宽的钝化区。与自来水相比,其腐蚀速率降低了2.2倍。暴露在自来水中的表面被红锈显著降解。另一方面,暴露于粗甘油后的S355MC表面受腐蚀影响较小,并覆盖有一层保护层。结果表明,粗甘油具有显著的缓蚀活性,可用于各种工艺。
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Corrosion Resistance of Steel S355MC in Crude Glycerol
Corrosion is the degradation of materials in oxidizing environments. In aqueous solutions, it is initiated by the surface reaction of the metallic material with the surrounding electrolyte. The corrosion rate of metals can be significantly reduced by the presence of organic compounds. Crude glycerol is an organic by-product of biodiesel, soap, and fatty acid production. It is produced in substantial amounts through transesterification. Crude glycerol contains several impurities and has low economic value. Its disposal in the environment is unwanted and potential applications need to be explored. In the present short communication, steel corrosion in crude glycerol has been investigated for the first time. The corrosion behavior of low-alloy structural steel S355MC in non-purified crude glycerol was studied by electrochemical methods. The results were compared with the use of tap water. The open-circuit potential (OCP) of S355MC in crude glycerol was more negative compared with that of tap water. The OCP was stable over time, indicating the rapid passivation of the steel substrate. The corrosion resistance was further studied by electrode polarization. On the polarization curve of S355MC in crude glycerol, a wide passivation region was found. Furthermore, the corrosion rate was 2.2 times smaller compared with that of tap water. The surface exposed to tap water was significantly degraded by red rust. The surface of S355MC after exposure to crude glycerol, on the other hand, was less affected by corrosion and covered with a protective layer. The results demonstrate a significant corrosion-inhibiting activity of crude glycerol that could be utilized in various technologies.
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