Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System

Abstract

Inhibition of corrosion of carbon steel in dam water by hexanesulphonic acid as its sodium salt C 6 H 13 SO 3 Na (SHXS) in the absence and presence of a bivalent cation zinc ion (Zn 2 þ ) has been investigated using weight loss method. Results of weight loss method indicate that inhibition efficiency (IE) increased with increase of inhibitor concentration. Polarization study reveals that SHXS-Zn 2+ system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM).