Surface Analysis of Inhibitor Film Formed by Butane Sulphonic Acid-Zn2+ System on Carbon Steel in Aqueous Medium

Abstract

The inhibition effect of butane sulphonic acid as its sodium salt (SBS) in combination with zinc ion (Zn²⁺) on the corrosion of carbon steel in a dam water has been studied using weight-loss and potentiodynamic polarization methods. Results of weight loss method indicated inhibition efficiency increased with increasing inhibitor concentration. The influence of sodium potassium tartrate (SPT) on the inhibition efficiency of the SBS-Zn²⁺ system has been evaluated. Polarization study reveals that SBS-Zn²⁺ system controls the cathodic reaction predominantly. The protective film is found to be UV fluorescent. The nature of the metal surface has been analyzed by scanning electron microscope (SEM) and energy dispersive X-ray detector (EDAX).