Abstract: The inhibitive action of Triethylenetetramine on zinc metal was evaluated in 0.5N HCl as corrosion medium ,using weight loss, gasometric and thermometric techniques. Parameters such as inhibition efficiency and corrosion rates were evaluated to assess the performance of the inhibitor. The results showed that the inhibitor displayed good corrosion inhibiting properties. The inhibition efficiency was found to increase with increase in the inhibitor concentration. To study the adsorption of the inhibitor on the metal surface, adsorption isotherm was plotted.