Three new gemini ionic liquids: Synthesis, characterizations and anticorrosion applications

Abstract Three gemini ionic liquids namely, 3,3′-(1,4-phenylenebis(methylene))bis(1-alkyl-1 H -imidazol-3-ium)bromide IL 1 , IL 2 , and IL 3 , were prepared and characterized via the conventional tools of analysis, elemental analysis, IR, and 1 H NMR spectroscopy. The thermal stability of these compounds was studied, using thermogravimetric analysis (TGA) technique. The gemini ionic liquids were tested as corrosion inhibitors for stainless steel (304 SS) in 0.5 M H 2 SO 4 solution using electrochemical techniques. The Results showed that gemini ionic liquids were effective with optimal corrosion inhibition values of 90.7%, 97.3% and 82.6% for IL 1 , IL 2 and IL 3 , respectively. The data confirmed also gemini ionic liquids are mixed type inhibitors.