Assessment of the corrosivity of AISI 1020 steel through microbiological analyzes and the mass loss technique in a clayey soil

This search aims to evaluate the corrosivity of AISI 1020 steel in clayey soil through microbiological analyzes and mass loss technique. Through results obtained, according identification methodology Bergey manual, presence two microorganisms was verified, Acidithiobacillus thiooxidans ferrooxidans , responsible for biocorrosion process addition filamentous fungi. The these bacteria does not generate a classification soil, however, it is known that they can accelerate corrosion when contact with metallic structure. Regarding rate, criterion used simulate assessment pipes, NACE Standard RP-07-75 adopted, which defined intensity corrosive process, obtaining as result sterilized sample value considered low, since free microbial activities any other contaminating factor, but without sterilization, classified having severe potential. Therefore, this research sought correlate characteristics representative Amazon buried pipes due microorganisms, would correspond corrosion. Although, many cases, there suspicion accuracy monitoring techniques, techniques were used, had positive relation one.