Résumé : Microbiological corrosion can be defined as an electrochemical process in which microorganisms facilitate the corrosion reaction of metals. This is a serious problem that can lead to damage to the installation, destruction of apparatus and reduction of process efficiency, which is associated with large economic losses. Microbiologically influenced corrosion is caused by microorganisms such as algae, lichen, fungi and bacteria. Fungus Hormoconis resinae is a huge problem of aviation fuel, sulfate-reducing bacteria form iron sulfides, which cause stress corrosion and cracking of structural materials. Iron-reducing bacteria form deposits of iron oxides and hydroxides that hide under their surface corrosion pits. Acid-producing bacteria form organic acids that are corrosive. Nitrogenous oxidizing bacteria conduct nitrification reaction that produces nitric acid. They oxidize nitrogen compounds, so they can deactivate inhibitors that have nitrogen in their structure. These microorganisms significantly contribute to corrosion. Many methods are used to prevent this form of corrosion. The most common of them are: washing the components of the installation, both physical and chemical, protective coatings, the usage of various biocides and corrosion inhibitors, e.g. quaternary ammonium compounds which field is now being dynamically developed. The purpose of the research conducted as part of the work was to check whether the inhibitor used would inhibit corrosion processes, or maybe just the opposite and would accelerate them. In order to determine the usability of corrosion inhibitor, gravimetric method was used. In the study of microbial corrosion, the added inhibitor significantly reduced the rate of this type of corrosion.