Functionalization of PVA to synthesize p-vinyl benzene sulfonate terpolymers – a comparative study of anticorrosion, adsorption and activation properties of the terpolymers on mild steel in 1 M HCl
Two water soluble terpolymers viz. PVA-AAm-PVBS (polyvinyl alcohol-g-poly(acrylamide-p-vinyl benzene sulfonate)) and PVA-AA-PVBS (polyvinyl alcohol-g-poly(acrylic acid-p-vinyl benzene sulfonate)) were synthesized and characterized by FTIR, NMR, TGA and DSC. The corrosion protection efficiency of the terpolymers for mild steel in 1 M HCl has been studied by weight loss technique at various temperatures. Adsorption parameters were derived by fitting the results to Temkin isotherm. The adsorption of the inhibitors on metal surface was further confirmed by surface analysis using SEM and AFM. Kinetic parameters were also derived to understand the corrosion process. Results consistently showed that, both terpolymers are good inhibitors.