Abstract
The inhibition characteristics of Trizma for the inhibition of the corrosion of aluminium in 1.0 M HCl solution were studied using weight loss method, potentiodynamic and electrochemical impedance spectroscopy (EIS) techniques. The results indicated that, Trizma act as an efficient mixed type inhibitor retarding both the general and pitting corrosion of aluminium (1 x 10(-2) M Trizma gave more than 95% inhibition). The surface techniques SEM and EDX were used to examine and analyze the surface of aluminium after its immersion in 1.0 M HCl in absence and presence of different concentrations of Trizma for 6 h. The results indicated that, the inhibition of corrosion of aluminium by Trizma is controlled by competitive adsorption. The experimental data of the adsorption of Trizma at aluminium surface were fitted to Langmuir isotherm and the Kinetic-thermodynamic model. The results indicated that Langmuir isotherm is not applied, however, the Kinetic-thermodynamic model fits the results and gave a value of Delta G degrees(ads) = -34.9 kJ/mol and adsorption of Trizma on the aluminium surface is (chemical/physical).