Study On Microbiologically Influenced Corrosion Of Antibacterial Pipeline Steel

At present,the development of oil and gas fields in China is still facing a serious problem of corrosion and perforation of gathering and transmission pipelines,and the corrosion caused by environmental microorganisms is considered to be one of the important causes of corrosion.Developing an economically applicable new type of antibacterial material is an important approach to inhibit Microbiologically Influenced Corrosion(MIC).In this paper,the SRB and TGB in the oilfield sewage were separated and purified,and the 16 SrDNA gene sequence tests were used to identify the purified SRB as the Desulfovibrio sp.The growth curve of SRB in the culture medium was measured by using an ultraviolet spectrophotometer,and the isolated SRB was found to have growth activity.Considering the antibacterial properties,the antibacterial elements were added to ordinary carbon steel and the different content of elements was controlled to obtain a new type of antibacterial carbon steel.In static corrosion tests SEM and CLSM were used to observe the biofilm,corrosion product film and pitting morphology.Corrosion experiment under different conditions with SRB and SRB/TGB symbiosis showed that the presence of SRB can accelerate uniform corrosion and pitting corrosion of carbon steel.The presence of TGB increased the microbial activity of SRB in the environment and thickened the biofilm on the surface of the material.Compared with ordinary carbon steel,the new antibacterial carbon steel shows good antibacterial performance when SRB alone exists and SRB/TGB symbiotic.With the increase of antibacterial element content,the antibacterial carbon steel has more obvious inhibition adsorption of SRB and mixed colonies on the surface,and has a lower corrosion rate and less pitting corrosion.