Kinetic and thermodynamic adsorption study of mild steel corrosion and inhibition of Azadirachta Indica gum in hydrochloric acid solution

The inhibition action of Azadirachta indica gum was tested as corrosion inhibitor for mild steel in 1 mol L-1 HCl using weight loss and electrochemical techniques. Results show that the inhibition efficiency increases with decreasing temperature and increasing inhibitors concentration. The effect of temperature (303 - 328±1 K) on the inhibition of corrosion have also been studied. Corrosion kinetic parameters and thermodynamic adsorption parameters have been calculated and discussed in detail. The adsorption of this gum on the mild steel surface obeys Langmuir adsorption isotherm. The mechanism of inhibition process is established using FT-IR spectroscopy.