The corrosion protection effect of carbon steel is dipped in sodium chloride has been evaluated at room temperature by using conventional weight loss method. The corrosion rate and inhibition efficiency has been determined from weight loss method. The corrosion inhibition efficiency increases with increase in concentration of the 2-(benzylidene-amino)-benzenethiol inhibitor. The corrosion rate decreases when increase in concentration of the 2-(benzylidene-amino)-benzenethiol inhibitor. This is owing to at the higher concentration of inhibitor solution which prevents the active site of a carbon steel and a protective film is formed over the carbon steel surface. The rate of corrosion is decreased with increasing addition of organic compound, probably due to progressive adsorption of the 2-(benzylidene-amino)-benzenethiol on the mild steel surface. The maximum inhibition efficiency was found to be 86.79%.Electrochemical studies have been used to observe the formation of protective film over the carbon steel surface. It is also recognized by surface analysis technique like FTIR and scanning electron microscopy. Smoothness and roughness of carbon steel surface has been observed and compared to blank and inhibitor system by SEM. The AFM microscopes confirm the roughness and smoothness of carbon steel surface.