The inhibition of corrosion of stainless steel in acidic medium by the inhibitor Benzyl tri methyl ammonium chloride has been investigated by weight loss method. The synergism between KI and Benzyl tri methyl ammonium chloride is also established. The combination consists of 0.0025 M Benzyl tri methyl ammonium chloride and 0.0018 M of KI offers good inhibition efficiency of 96%. Polarisation study reveals that this combination functions as a mixed inhibitor. Impedance spectra reveal that a protective film is formed on the metal surface. The surface morphology has been analysed by SEM.
