Document Type: Original Article
Department of Mechanical Engineering, Faculty of Science and Technology, University of Biskra, Algeria
Bacterial corrosion is the phenomenon where sulfate-reducing bacteria (SRB) metabolic acts help creating favorable conditions for corrosion to occur. This type of corrosion is widely observed in anaerobic industrial environments especially in petroleum pipelines and might result in severe losses in oil and gas industries. Many commercial substances are used in the petroleum industry in order to control this phenomenon. Here, we tried to evaluate the effectiveness of using Biocide 2 CHIMEC 7660 in later phase bacterial corrosion on N80 steel. In order to achieve that aim, N80 steel samples were put in an anaerobic simulation in the presence of (SRB) and after 60 days of bacterial exposure, Biocide 2 CHIMEC 7660 was added to treated samples. The experiment was then continued for another 30 days, where the surfaces of control and treated samples were studied using scanning electronic microscope (SEM) and energy-dispersive X-ray spectrometry (EDS). (SEM) scans showed an efficient removal of a large part of the deposits and colonies on treated surfaces compared to control. However, both samples (EDS) analysis illustrated the presence of oxygen and an increased amount of sulfur. Although biocide application was efficient enough to control bacterial growth and eliminate the forming residues after 60 days of exposure to (SRB), the bacterial corrosion occurred before the treatment was enough to cause damage to the studied surface. This study refers to the effectiveness of using Biocide 2 CHIMEC 7660 and emphasizes on its early application.