Electroanalytical studies on the Interaction of 4-(N, N-Dimethylaminobenzilidine)-3-mercapto-6-methyl-1, 2, 4-triazin (4H)-5-one (DAMMT) with mild steel in perchloric acid

The corrosion protection properties of 4-(N, N-Dimethylaminobenzilidine)-3-mercapto-6-methyl-1, 2, 4-triazin (4H)-5-one (DAMMT) on mild steel in perchloric acid has been studied using the conventional gravimetric method, potentiodynamic polarization studies (Tafel), linear polarization studies (LPR), electrochemical impedance spectroscopy studies (EIS), adsorption studies, Scanning electron microscopy and Atomic force microscopy. The effect of inhibitor concentration, temperature, inhibition time, corrosion rate and surface characteristics are investigated. The corrosion rate and other electro analytical parameters are evaluated and the probable mechanism is also proposed. The results show that DAMMT possesses excellent corrosion inhibition property towards MS in HClO4. The inhibition efficiency increases with inhibitor concentration and decreases with exposure time, temperature and acid concentration. Polarization curves show that DAMMT behave as mixed type inhibitor. Changes in the impedance parameters were indicative of the adsorption of DAMMT and formation of protective film on metal surface. The best fit for inhibitor adsorption is obtained by Langmuir isotherm model