Exploring the role of Sodium dodecyl sulphate in presence of 2-thioureidobenzoxazole as enhancer of corrosion inhibition of mild steel in 2M HCl solution

Abstract

In the current communication, we report the role of sodium do-decyl sulphate (SDS) as the corrosion inhibition enhancer for 2-thioureidobenzoxazole (BOT) on mild steel (MS) in 2M Hydrochloric acid electrolyte. Though, 2-thioureidobenzoxazole shows limited inhibition due of the presence of oxygen atom, addition of small quantity of SDS enhances the inhibition by 10-fold. Electrochemical impedance spectroscopy, Tafel measurements and weight loss studies were used in the current work. The variation of temperature on the inhibition efficiency of SDS+BOT on MS surface was explored. The Gibbs free energy of adsorption values showed that inhibition process is spontaneous. Langmuir adsorption was prevalent and the morphological characterization was carried out using scanning electron microscope which indicated the role of SDS as a versatile performance enhancer for BOT. This combination, act as an anodic mixed type inhibitor.