Abstract
A study was carried out to find the temperature effect on inhibition of mild steel dissolution using an acryl terpolymer: polyvinyl alcohol-g-poly(acrylic acid-vinyl sulfonate) in 1 M HCl. The corrosion inhibition studies were carried out at five different temperatures (303 K- 343 K) by AC and DC polarization method. In order to gain a detailed insight on the nature of adsorption of the terpolymer, several isotherms were fitted and the adsorption characteristics were approximated using Temkin isotherm using the surface coverage values obtained from weight loss and electrochemical method. Thermodynamic parameters of adsorption such as equilibrium constant, Gibb’s free energy, adsorption heat and adsorption entropy were evaluated and discussed. The surface morphology of the mild steel before and after the adsorption of the inhibitors was confirmed by Atomic Force Microscopy. Various parameters that determine the kinetics of mild steel dissolution such as activation energy, enthalpy and entropy were also calculated.
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