An investigation on corrosion inhibition efficacy of benzodiazepines on mild steel in acid medium

Abstract

Corrosion inhibition efficacy of the synthesized benzodiazepines namely Dimethyl-[4-(4-phenyl-2,3-dihydro-1H-benzo[b][1,4]diazepin-2-yl)-phenyl]-amine (DPBD) and Dimethyl-[4-(4-methyl-2,3-dihydro-1H-benzo[b][1,4]diazepin-2-yl)-phenyl]-amine (DMBD) on commercially available mild steel in sulphuric acid medium was investigated by Electrochemical and Weight loss studies. From the results, it has been affirmed that DPBD is effective in combating corrosion, exhibiting maximum inhibition efficacy of 86% at 100 ppm at 303 K. The adsorption efficacy of DPBD and DMBD over the metallic surface was identified to comply with the Langmuir adsorption isotherm model. The development of a protective layer on the surface of the mild steel was confirmed by the Scanning Electron Microscopic studies (SEM).