Acid corrosion inhibition of 1018 carbon steel by using mentha spicata

Abstract

A study on the use of Mentha spicata (M. spicata) as eco-friendly inhibitor for the corrosion of 1018 carbon steel in sulfuric acid was performed with the use of potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) measurements at 25, 40 and 60°C. Results have shown that M. spicata is a good, mixed type of corrosion inhibitor. An increase in its efficiency was observed when both its concentration and elapsing time increased, but when the temperature increased, its efficiency decreased. M. spicata contains several compounds which contain heteroatoms in their structure, which are chemically adsorbed on to the steel surface by following a Frumkin type of adsorption isotherm, forming protective corrosion products.