EXPERIMENTAL CORROSION CONTROL OF CUPRONICKEL ALLOYS IN ACIDIC MEDIUM BY COMPOUNDS OF AMINES

Our research focused on the capability of Naphthylamine (NPHA) & Phenylenediamine (PHDA) to inhibit the corrosion of Cu-Ni alloys in HCl solution, which was examined using the weight wastage technique. Increasing the concentration of (NPHA & PHDA) reduced the corrosion values, demonstrating the influence of corrosion inhibition. Adsorption of (NPHA) on the surface of the (Cu-Ni) alloy plays an important role in repression activities. Corrosion inhibitors are compounds that, when introduced in tiny quantities to an acidic media, prevent the corrosion process from expanding. Inhibitors are one of the most effective methods of preventing corrosion in metal alloys, and they are widely utilized. Corrosion prevention of (Copper-Nickel) alloy in acidic solutions (3.5 % HCl) at the temperature (30 - 50 ℃) was calculated in two cases; with and without inhibitors. Naphthylamine (NPHA) and Phenylenediamine (PHDA) indicated that the substances used in the experiential work were at concentrations (2 - 8 g/l). The method of weight-loss was employed to assess the values of corrosion rates. Corrosion rate value decreased with an increase in the concentrations of inhibitor and decreasing the temperature. The values of adsorption isotherm of inhibitor (NPHA) on the sample surface were observed to conform to Freundlich, in another hand the data of kinetic-thermodynamic and isotherms of adsorption were applied to assess the equilibrium constants (K) values