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