Analysis of corrosion defects on oil pipeline surface using scanning electron microscopy and soil thionic and sulfate-reducing bacteria quantification

We completed an analysis of corrosion defects on oil pipeline surface by instrumentality of scanning electron microscopy and identified soil thionic and sulfate-reducing bacteria quantity. A surface of samples was studied by using of raster electron microscopy as a preparation for qualitative and quantitative analysis of elemental composition. Was identified a quantity of sulfate-reducing and thionic bacteria in a samples of soil contiguous to the surface of underground oil pipelines in the of Khanty-Mansiysk autonomous region territory (Ugra). A result of this research shows a significant oxidative activity, which accompanied an expressed corrosion process. Microbiological analysis of soil shows an existence of thionic bacteria and an absence of sulfate-reducing bacteria. Microorganisms existed in soil induces the corrosion of pipeline steel. Using of scanning electron microscopy in a combination with finding of quantitative specification of thionic and sulfate-reducing bacteria in soils allows to study the nature of corrosive surface of the oil pipelines and to evaluate an extension degree of biocorrosion in complex. (C) 2016 The Authors. Published by Elsevier Ltd.