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

Abstract

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.

Corrosive Behavior of ASTM A131 Grade A36 Carbon Steel Exposed in Diesel S10/ Saline Water

“…This process of biodegradation may have been influenced by microorganisms, which can use the diesel S10 as a source of carbon and nutrients for its development 4 .…”

“…This process is closely associated to the accumulation of a layer of water at the bottom of the storage tank. Thus, this accumulation of water contributes to a biodegradation of diesel oil and biodiesel and, consequently, it promotes corrosion 4 . Since there is no uniformity in the composition of biodiesel in the diesel, the identification of the factors that cause biodegradation of the fuel becomes complex.…”