Citrus sinensis Extract as a Green Inhibitor for the Corrosion of Carbon Steel in Sulphuric Acid Solution

Abstract

Citrus sinensis extract is considered a good inhibitor to protect the carbon steel in half of molar of sulfuric acid from corrosion, as it was found from the results of chemical methods such as the weight loss (ML) method and also from the results of electrochemical methods such as potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM). The polarization curves indicated that this extract acts as a mixed kind inhibitor. The adsorption of this extract on the carbon steel surface is of mixed type physisorption and chemisorption, but chemisorption is the most effective one and followed Temkin adsorption isotherm. Several tests have proved a layer that protects carbon steel from corrosion.