Adsorption, Surface Morphological, and Electrochemical Studies on the Inhibitive Properties of 4-(N, N-dimethylaminobenzilidine)-3-mercapto-6-methyl-1, 2, 4-triazin (4H)-5-one (DAMMT) on Mild Steel in 0.5 N H2SO4

Abstract

Inhibition of mild steel corrosion in 0.5 N sulfuric acid by 4-(N, N-dimethylaminobenzilidine)-3-mercapto-6-methyl-1, 2, 4-triazin (4H)-5-one (DAMMT) was studied using polarization studies (Tafel); electrochemical impedance spectroscopy studies (EIS), adsorption studies, and surface morphological studies (SEM and AFM). The effect of inhibitor concentrations on corrosion rate, the effect of temperature, degree of surface coverage, adsorption kinetics, and surface morphology are investigated. Results show that the rate of corrosion increases with temperature in the absence and presence of inhibitor. Activation energies and enthalpies of activation in the presence and absence of DAMMT were obtained by measuring the temperature dependence of the corrosion current. DAMMT exhibits excellent inhibition properties towards MS and act as a mixed type inhibitor.