A study of the adsorption properties of commercial carbon dioxide corrosion inhibitor formulations

Corrosion rate data for several commercial carbon dioxide corrosion inhibit ors have been fitted to the Temkin adsorption isotherm and van't Hoff equat ion, enabling a determination of the enthalpy of adsorption (DeltaH(ad)(o)) . It has been found that experimentally determined DeltaH(ad)(o) values for commercial inhibitor formulations can provide valuable insights into the b ehaviour of the inherent active components. The temperature sensitivities a long with the mechanism of adsorption (physi- or chemisorption) and the min imum concentration required for activity of inhibitors is determinable by t his approach. Additionally, FTIR has been used to identify those inhibitors that are tenaciously adsorbed to steel, and suitable for use in batch trea tment applications.