Corrosion Inhibition of Medium-Carbon Steel Using Oleander Leaf Extracts in Acidic Environments

The research deals with a kinetic and thermodynamic study of using an organic inhibitor extracted from oleander leaves (aqueous extract and alcoholic extract) to inhibit the corrosion of medium carbon steel in an acidic medium (1M) HCL. Several tests were conducted to evaluate the performance of this inhibitor. They included measuring the corrosion rate by weight loss method at different concentrations of the inhibitor (30, 40, 50, 60)% mg, as the inhibition efficiency reached 89.1% when using the aqueous oleander leaf extract at a concentration of (60)% mg and a temperature of 293K and reached 92.2% when using the alcoholic oleander leaf extract at a concentration of (60)% mg and a temperature of 293K. Finally, microscopic examination was conducted and the results showed that the used inhibitors were not only an alternative to traditional inhibitors, but were better than them in all the testing methods conducted to evaluate their performance. It is less expensive because it is natural and widely available in our beloved country. It is more efficient than other common inhibitors is less toxic and does not pollute the environment.