Inhibition of Corrosion with Helvolic Acid in API 5L X70 Steel Immerse in Saline Medium

摘要

Using the Electrochemical Impedance Spectroscopy technique, helvolic acid was evaluated using API 5L X70 steel test cylinder under static and hydrodynamic conditions (turbulent flow) in saline medium. Under static conditions it reached an inhibition efficiency of 93% for 50 ppm while for 100 and 1000 rpm the efficiency decreases reaching >80% from 5 ppm. The adsorption mechanism of the inhibitor under static conditions is chemisorption according to the Langmuir isotherm. Finally, for 100 and 1000 rpm the adsorption process is a combined one.