Biocorrosion on Surface of ASTM A283 Carbon Steel, Exposed in Diesel S10 and Tap Water

This paper sets out to evaluate the corrosion and biocorrosion of carbon steel ASTM A283 exposed to a Diesel S10 oil/tap water system under static conditions for 90 days. The following analyzes were performed: physico-chemical in tap water, sulfur content in Diesel S10 and quantification of sessile microorganisms in the biofilm formed on the metal. To monitor the corrosion process, mass loss, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), confocal laser microscopy and X-ray diffraction (XRD) were performed. There were changes in the composition of the medium, correlated with the formation of corrosion and biofilm products. There was biodegradation of the fuel, which in contact with water influenced the development of microorganisms. Moreover, the corrosion rate was classified as moderate, the main form of corrosion being seen to be local alveolar corrosion. Therefore, the results revealed that water in diesel oil can be an aggravating factor in the process of corrosion and biocorrosion.

本研究旨在评估ASTM A283级碳钢置于S10号柴油（Diesel S10）/自来水体系中、于静态工况下暴露90天的腐蚀与生物腐蚀行为。本研究开展了以下分析：自来水的理化指标检测、S10号柴油的硫含量测定，以及金属表面形成的生物膜中固着微生物的定量分析。为监测腐蚀过程，本研究实施了质量损失测试、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）、激光共聚焦显微镜及X射线衍射（XRD）分析。试验介质的组分发生变化，该变化与腐蚀产物及生物膜的形成存在相关性。燃料发生生物降解，其与水接触后会影响微生物的生长繁殖。此外，腐蚀速率被评定为中等，主要腐蚀类型为局部穴状腐蚀。综上，研究结果表明，柴油中的水分可成为腐蚀与生物腐蚀过程的加剧因素。