Cationic gemini surfactants as corrosion inhibitors of stainless steel (AISI 304) in 3M hydrochloric acid

摘要

As a corrosion prevention strategy, the use of corrosion inhibitors is one of the simplest and most effective ways of preventing corrosion. Among the organic corrosion inhibitors, cationic surfactants are a potential candidate as they show high inhibition efficacy due to their ability to adsorb onto metal surfaces. Gemini surfactants are considered very effective corrosion inhibitors due to their low critical micelle concentration (CMC), high surface activity and good wetting properties. In this study, three cationic gemini surfactants with a flexible spacer: l,6-hexamethylene-bis(N-dodecyl-M/V-dimethylammonium) dibromide (12-6-12), 1.6-hexamethylene-bis(N-dodecyl-N-hydroxyethyl-TV-methylammonium) dibromide (G6-MOH-12) and 3-oxa-l,5-pentamethyleno-bis(N-dodecyl-N-hydroxyethyl-N-methylammonium chloride) (12-MOH-O-MOH-12) were synthesised and characterised. Their corrosion inhibition efficiency of stainless steel AISI 304 in 3M HC1, was investigated by weight loss and EIS. The surface of the stainless steel samples were studied by confocal laser scanning microscope (CLSM) and scanning electron microscopy (SEM).