Electrochemical Study of Inhibitory Effect of Tartrate Salt on Self-Corrosion of Pure Aluminum in Potasium Hydroxide Solution of Aluminum-Air Batteries

In this research, the corrosion of pure aluminum (as anode of aluminum-air batteries) in ۱ M of potassium hydroxide solution in the presence and absence of potassium sodium tartrate tetra hydrate at ۳۰ °C was investigated. Since the self-corrosion reaction of aluminum which accompanied with hydrogen release, causes aluminum to corrode in alkaline environments which in turn reduces battery power, adding inhibitors to the electrolyte is the most effective way to solve this problem. The corrosion study of aluminum has been performed by adding inhibitors to the electrolyte using electrochemical and spectroscopic methods including study of polarization diagrams, impedance curves, X-ray analysis and scanning electron microscopy. The results show increase in corrosion reduction process of aluminum sheet with increasing inhibitor concentration, which has the highest value at optimum concentration. In addition, the surface adsorption of inhibitors onto the aluminum was matched with the Langmuir adsorption isotherms. Thermodynamic parameters of adsorption such as equilibrium constant (۵۰۰۰) and standard Gibbs free energy change (-۳۱.۵۷ kJ/mole) were also calculated.

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باتری آلومینیم – هوا ، بازدارنده خوردگی ، منحنی های پلاریزاسیون ، منحنی های امپدانس الکتروشیمیایی