Adsorption of some allylic compounds on polarized 304 austenitic stainless steel electrodes in H2SO4 solutions

The adsorption of different compounds containing the allylic group on 304 austenitic stainless steel (304SS) in H2SO4 solutions was investigated under different conditions. These include the effect of H,SO, (1-12 M), temperature (5-45 degrees C), inhibitor concentration [inhibitor] (10(-6)-10(-1) M) and the effect of Cl- on the inhibition efficiency (%Ef.). The dependence of the open circuit potential (OCP) on time as well as on the above-mentioned conditions was also investigated. The current densities (cds) for the cathodic and anodic reactions were reported under the specified conditions. Such additives were found to greatly reduce the rate of reaction and for the weak inhibitors the extent of adsorption is enhanced in the presence of Cl-. In addition, the kinetic parameters and thermodynamic functions were evaluated using appropriate equations.