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In this paper, the corrosion inhibition of cationic gemini surfactant 1,4-butan-bis-(dimethyl dodecyl ammonium bromide), in the absence and presence of halide salts (NaCl, NaBr and NaI) on steel in HCl was investigated at 20±1 ⁰C. The effects of pH, immersion time and salt concentration on the corrosion inhibition of steel were studied using weight loss, open circuit potential and electrochemical impedance spectroscopy. Inhibition efficiency was found to increase with increasing surfactant concentration. Synergistic effects between the surfactant and the salts were studied. The inhibition efficiency was found to increase with increasing salt concentration. This composite inhibitor containing gemini surfactant and halide was efficient and low-cost for steel corrosion inhibition in HCl.

Corrosion inhibition effect of cationic surfactant DTAB (dodecyl threemethyl ammonium bromide) on low carbon steel in 1M HCl was studied using weight loss method. Inhibition efficiency increased with the increase of surfactant concentration. Also, synergistic effect between surfactant and chloride ions in 1M HCl was investigated with the presence of different concentration of NaCl. The inhibition efficiency increased with the increase of NaCl concentration and reached the maximum value near 0.1 M. This composite inhibitor system containing cationic surfactant and chloride ions was efficient and low-cast for steel corrosion inhibition in HCl medium, even when the concentration of DTAB was as low as 0.5x10 -4 M.

Corrosion inhibition efficiency of Gemini surfactant 1,4-butan-bis-dimethyl dodecyl ammonium bromide (designed as 12-4-12), 1,4-butan-bis-dimethyl tetradecyl ammonium bromide (designed as 14-4-14), conventional surfactants dodecyl thrimethyl ammonium bromide (DTAB) and tetradecyl thrimethyl ammonium bromide (TTAB) on low carbon steel is investigated using three common methods namely, weight loss, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). The influence of chain length and temperature of the media is verified. Data indicate that, the corrosion inhibition efficiency is improved by increasing the concentration and chain length of the surfactants. Corrosion rate of steel increases by increasing the temperature of the medium containing surfactant. Adsorption isotherm of used surfactants and kinetic parameters are studied.