Surface protection of carbon steel by Octane sulphonic acid-Curcumin system system

摘要

This research aims to study the corrosion inhibition behavior of curcumin (CU) a natural product in combination with octane sulphonic acid as its sodium salt (SOS) on the corrosion of carbon steel in a dam water using weight-loss method. Results of weight loss method indicated inhibition efficiency (IE) increased with increasing inhibitor concentration. As the immersion period increases IE decreases. Polarization study reveals that SOS-CU system controls the anodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. These observations have been supported by surface morphology study using scanning electron microscopy (SEM) carried out on the carbon steel samples in the absence and presence of inhibitor.