Design and synthesis of a novel class of inhibitors for mild steel corrosion in acidic and carbon dioxide-saturated saline media

p-(9-(2-Methylisoxazolidin-5-yl)nonyloxy)benzaldehyde I, prepared using a cycloaddition protocol, was elaborated into its cinnamaldehyde derivative II which upon quarternization with propargyl chloride afforded III bearing an interesting blend of structural traits suitable for imparting inhibition of mild steel corrosion. Novel compounds I-Ill showed efficient inhibition against mild steel corrosion in CO2-0.5 M NaCl (40 degrees C, 1 atm; 120 degrees C, 10 bar), 1,4, 7.7 M HCl, and 0.5 M H2SO4 at 60 degrees C as determined by gravimetry and electrochemical methods. The presence of carbonaceous surface and nitrogen, as revealed by XPS study, indicated the formation of a film covering the metal surface, which imparted corrosion inhibition. (C) 2014 Elsevier Ltd. All rights reserved.