Cyclic nitrones as novel organic corrosion inhibitors for carbon steel in acidic media

Purpose - To demonstrate corrosion inhibition capabilities of new cyclic nitrones, containing hydrophobic substituents. Design/methodology/approach - A number of new cyclic nitrones were synthesized. Corrosion inhibition efficiencies of these organic inhibitors were determined by gravimetric and electrochemical methods, using carbon steel as the substrate metal and 1 M HCl at 60°C as the corrosive environment. Concentration of inhibitor was varied between 50 and 400 ppm. Findings - All compounds exhibited excellent corrosion efficiencies that ranged between 90.0 and 98.3 percent in 1 M HCl at 60°C. Tafel tests corroborated these results. Research limitations/implications - The inhibitors were tested in acidic medium. It is unknown how these inhibitors will function in the presence of other ions that are typically present in natural corrosive environment. Originality/value - All organic compounds presented in this work are new and this is the first time their corrosion inhibition characteristics have been evaluated.