Corrosion and Inhibition of 316L stainless steel in neutral medium by 2-Mercaptobenzimidazole

Abstract

The electrochemical behavior of 316L stainless steel (316L SS) in NaCl solution by using potentiondynamic, EDX and scanning electron microscope (SEM) techniques was determined. The addition effect of 2-mercaptobenzimidazole (MBI) on the pitting corrosion of 316L SS in NaCl solutions were investigated at different temperatures (25, 40, 50 and 60 °C). The results indicate that the increase of MBI concentration leads to shift the pitting potential to more positive potential, i.e. pitting corrosion inhibition. The corrosion inhibition behavior of MBI argued to the adsorption of 2- mercaptobenzimidazole, which can impede the aggressive anions to reach the base 316L SS surface. The protection efficiency increases with increasing MBI concentration but decreased with the increasing of the temperature.