ETYLTRIMETHYL ammonium bromide (CTAB) was investigated …….as corrosion inhibitors of mild steel in 0.1 and 0.5 M HCl solutions using weight loss, Tafel polarization and electrochemical impedance spectroscopy techniques.The experimental results showed that the inhibition efficiency increases with increasing of CTAB concentrations but decreases with increasing temperature.The adsorption of CTAB on t...