In heterogeneous system of oil-plast water hydrogen sulfite as synergist increases an efficiency of nitrogen containing inhibitors (quaternary ammonium salts, etc). The decrease of corrosion has been connected with hydrophobization of metal surface and formation of multi-layer protecting film. In the presence of inhibitors the structures of sulfides are compact, the adhesion with metal is more solid. The acidic inhibitors - unsaturated aminoketones, pyrrazole derivatives, bicyclic alcohol and ethers, ethers of cyclic and bicyclic carboxylic acids, etc have been created. The adsorption of molecules on steel has been established by method of reflecting IR-spectroscopy. The role of sulfate-reducing bacteria (SRB) in formation of hydrogen sulfite and in initiation of bacterial steel corrosion has been investigated. The wide spectrum of biocides against SRB - bicyclic compounds of acetylene series and their chlorine derivatives, etc has been developed and the dependence of activity on structure has been established. The maximum efficiency of bicyclic biocides observed in case of aldehyde and alcohol groups.

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