Organic inhibitors of steel corrosion (analytical review of publications)

Abstract

Analysis of publications is presented on studies of organic steel corrosion inhibitors in environments with hydrogen sulfide with the participation of microorganisms. A relationship is identified between the structure of organic compounds and the composition of their molecules and their efficiency in inhibition of steel corrosion. The effect of organic compounds (phenols, ketones, and quinones) on the metal corrosion process is discussed. A decrease in the rate of cathodic or anodic processes is studied, as dependent on the structure of molecules of organic compounds and pH of the medium. The choice of inhibitors for suppression of corrosion with participation of microorganisms is considered with account for the specificity of their action on a given microorganism and duration of their inhibiting properties: they must not be activated by other substances in the medium, the microorganism must not develop resistance. The mechanism of action of the inhibitor depends on the composition of its molecules, the nature of the corrosive medium and metal. The general stage is the adsorption of its molecules on the metal, depending, in the first instance, on its electronic structure that determines the possibility of chemisorption on the metal surface, as well as on the charge of the metal surface and particles of organic compounds acting as corrosion inhibitors.