Aloe Saponaria Gel as a Green Corrosion Inhibitor of Carbon Steel in an Acid Medium

Chemical inhibitors play an important role in protection and mitigation strategies to retard corrosion; however, their use can cause negative effects on the environment. Due to this, the use of plant extracts as corrosion inhibitors has been suggested since they are non-toxic, biodegradable and abundant in nature. Aloe Saponaria gel was used as a green corrosion inhibitor of mild carbon steel in 0.5 M HCl acid medium. The corrosion inhibition performance was investigated by electrochemical impedance and potentiodynamic polarization in the absence and presence of the inhibitor, in different concentrations (10, 20, 30% v/v), at the following temperatures: 298, 308, 315, and 323 K. The trend is observed that the higher the inhibitor concentration, the lower the corrosion rate, this is due to the adsorption of organic matter creating a cover on the surface of the steel.