Kinetic‐Thermodynamic and Adsorption Isotherms Analyses for the Inhibition of the Acid Corrosion of Steel by Cyclic and Open‐Chain Amines

The corrosion inhibition characteristics of the quadridentate macrocycle 1, 4, 8, 11 tetra-azacyclotetradecane (cyclam) on steel in sulfuric acid media are investigated at 25, 35, 45, and 55 o C, and the thermodynamic energy parameters calculated. In addition the inhibition characteristics of the open-chain polydentate amines, ethylenediamine (en), diethylenetriamine (dien), triethylenetetraamine (trien), and tetraethylenepentamine (tetren) were investigated at 25 o C