Abstract
The inhibiting effect of Gum Acacia (GA) grafted with polyacrylamide was investigated on mild steel (MS) corrosion in 15% HCl using gravimetric and electrochemical measurements. Among different grafted co-polymers, gum acacia (1g) and acrylamide (3g) resulted in maximum corrosion inhibition efficiency 94.08% at 0.3g/L. The potentiodynamic polarization studies showed that all the studied inhibitors act as mixed inhibitor. Different thermodynamic and kinetic parameters have also been discussed. The adsorption of inhibitor molecules on MS surface obeys the Langmuir adsorption isotherm. Field emission scanning electron microscopy (FE-SEM), Energy dispersive x-ray spectroscopy (EDX) and Atomic force microscopy (AFM) images confirmed the formation of protective films of GA and its graft co-polymers on metal surface.
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