Influence of temperature on corrosion inhibition for carbon steel by rice straw extract in HCl solution: Synergistic effect of cationic surfactant

Abstract

The corrosion inhibitive effects of rice straw extract (RSE) for carbon steel in 1 M HCl solution was investigated. Weight loss method and potentiodynamic polarization was used to study the inhibition efficiency of cationic surfactant, benzalkonium chloride (BKC) additives into rice straw extract corrosion inhibitor. Inhibition efficiency was determined by comparing the inhibition efficiency in the absence and presence of additives. The corrosion inhibition efficiency was found to increase with surfactant concentration and decreased with increasing temperature which is due to the fact that, the rate of carbon steel corrosion was higher than the rate of adsorption of inhibitor molecules. The inhibiting action of the rice straw extract was considerably enhanced by the addition of cationic surfactant. The results obtained from weight loss analysis are in direct agreement with tafel polarization studies. Tafel polarization data indicated that a combination of RSE and BKC acts as a mixed - type inhibitor.