Imidazoline gemini surfactants as corrosion inhibitor for copper in NaCl solution

Abstract

The Gemini imidazoline surfactants were synthesized from a series of saturated fatty acids. Their corrosion inhibition on copper in NaCl solution was studied by electrochemical method. It was found that the suppressive efficiency depended on pH, carbon chain length, and the concentrations of surfactants. The results show that such kind of surfactants has outstanding suppressive effect on copper in NaCl solution, and the restrained efficiency of Gemini imidazoline in alkaline solution is better than in neutral solution. The shorter the carbon chain length is, the higher the suppressive efficiency is. The higher the concentration of Gemini imidazoline surfactant is, the better the inhibitive effect is.