Sodium diethyldithiocarbamate as a corrosion inhibitor of cold rolled steel in 0.5 M hydrochloric acid solution

Abstract

Sodium diethyldithiocarbamate (DDTC) as a corrosion inhibitor for cold rolled steel (CRS) in 0.5M HCl solution was investigated by Tafel polarization and electrochemical impedance spectroscopy (EIS). All the data indicate that DDTC can inhibit the corrosion of CRS in HCl solution. Polarization data show that DDTC mainly acts as a good inhibitor though it can accelerate the anodic reaction somewhat. Adsorption of DDTC is found to follow the Langmuir adsorption isotherm. Thermodynamic analysis indicates that both physisorption and chemisorption probably occur in the adsorption process. SEM and FTIR results further validate that DDTC can adsorb on CRS surface.