Study of the Hydrodynamic Conditions of the 2-Mercaptoimidazole Inhibitor Derivatives for Mild STEEL Immersed in NaCl at Neutral pH

Introduction

Recently, our research group has demonstrated that some organic molecules such as 2-MBI derivatives can be also considered as an effective corrosion inhibitors for carbon steels in acidic media.

Results

Fig. 1 shows the variation of the corrosion inhibition efficiency, which indicates that at low concentrations the best inhibitor was the 2-mercaptoimidazole (2MI) giving 90% IE at 10 ppm, thus being the least efficient the 5-nitro-2-mercaptobenzimidazole (5N-2MBI) with an efficiency of 80% inhibition at 200 ppm.

Moreover, this compound follows an adsorption mechanism, which can be adequately described by the Langmuir isotherm thereby pointing to a physisorption process on the metal surface.