Study of a Triazole Derivative as Corrosion Inhibitor for Mild Steel in Phosphoric Acid Solution.

The corrosion inhibition by a triazole derivative (PAMT) on mild steel in phosphoric acid (H₃PO₄) solution has been investigated by weight loss and polarization methods. The experimental results reveal that the compound has a significant inhibiting effect on the corrosion of steel in H₃PO₄ solution. It also shows good corrosion inhibition at higher concentration of H₃PO₄. Potentiodynamic polarization studies have shown that the compound acts as a mixed-type inhibitor retarding the anodic and cathodic corrosion reactions with predominant effect on the cathodic reaction. The values of inhibition efficiency obtained from weight loss and polarization measurements are in good agreement. The adsorption of this compound is found to obey the Langmuir adsorption isotherm. Some kinetic and thermodynamic parameters such as apparent activation energy, frequency factor, and adsorption free energy have been calculated and discussed. [ABSTRACT FROM AUTHOR]