Synergistic Inhibition Effect of Mikania Micrantha Extract with Potassium Iodide on the Corrosion of Cold Rolled Steel in Methanesulfonic Acid Solution

Abstract

The synergistic inhibition effect of Mikania micrantha extract (MME) with KI mixture on the corrosion of cold rolled steel (CRS) in methanesulfonic acid (MSA) was conducted by weight loss, electrochemical techniques and surface characterizations. The experimental results indicate that either MME or KI exerts moderate inhibition with a maximum inhibition efficiency below 74 %. However, MMEKI mixture exhibits an efficient performance with a maximum inhibition efficiency of 91%. There is an evident synergism between MME and KI with a corresponding synergism parameter higher than 1. Several organic components in MME act together to exhibit the inhibitive ability.

Keywords: Cold rolled steel, Mikania micrantha extract, Green inhibitor, Electrochemical measurements, Surface characterizations