The Drug Domperidone as a Corrosion Inhibitor for X60 Steel in Hydrochloric Acid Solution

Electrochemical and SEM methods were used to study domperidone (DPD) as an organic corrosion inhibitor for X60 carbon steel in 1 M hydrochloric acid solution. The corrosion inhibition rate decreases with increasing corrosion inhibitor concentration. The inhibition efficiency was the highest when 400 mg/L DPD inhibitor was added, showing a type of mixed inhibitor. The adsorption of DPD inhibitor on the steel surface conforms to the Langmuir isotherm as a combination of physical and chemical adsorption. In addition, the adsorption conformation of the inhibitor molecules on the steel surface was analyzed by MD calculations and the adsorption energy was calculated.