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

► DDTC can acts as a cathodic type inhibitor for CRS in HCl solution. ► The activation energy, Ea, increases with increasing the concentration of DDTC. ► The driving force for adsorption of DDTC on CRS is the increase in entropy. ► DDTC adsorbs on CRS surface probably by chemisorption and physisorption. ► Variation of DDTC results in different effect for time on inhibition efficiency.