Abstract
The inhibition efficiency of the synthesized inhibitor 3-[(4-methoxy phenyl)imino]-1,3-dihydro-2H- indole-2-one in 0.1 N HCl solution was studied by using weight loss, electrochemical analysis like open circuit potential and potentiodynamic polarization methods. It was observed that the inhibition efficiency increases by increasing the concentration of the inhibitor. Maximum inhibition of 92.10% was observed at 600 ppm inhibitor concentration. The inhibitor works as an efficient anti-corrosive agent and it was also supported by electrochemical data. From the results obtained, it was observed that the data best fitted Langmuir adsorption isotherm. The polarization studies indicated that the used inhibitor is a mixed type of inhibitor. The thermodynamic parameters of activation energy and adsorption suggested that the used inhibitor supported both physical and chemical adsorption processes. The protective layer formed on the mild steel surface was analyzed by using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX) techniques. The results obtained from weight loss analysis, electrochemical analysis and surface analytical techniques were in good agreement with each other.