Document Type : Original Article
Authors
1
Center of Excellence in Electrochemistry, University of Tehran, Tehran, Iran
2
Department of Analytical Chemistry, University of Kashan, Kashan, P.O. Box 15875-4413, Iran
3
Department of Materials and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., P.O. Box 15875–4413, Tehran, Iran
Abstract
The evaluation of the Aluminum alloy 1050 as an anode in an Al/AgO battery in an aerated 6.0 M KOH solution involves studying its corrosion behavior and battery performance. Various techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy, electrochemical noise analysis, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and galvanostatic discharge, are employed to assess these aspects. The polarization results reveal that the addition of various concentrations of thiourea to ZnO as the best-mixed inhibitor reduces the corrosion rate of aluminum during the initial stages from 4638.9 mpy to 1634.6 mpy. Also, this type of inhibitor leads to an increase in polarization resistance from 3.10 Ω.cm2 to 8.36 Ω.cm2, which are in good agreement with the results of impedance spectroscopy studies. Furthermore, based on the findings of EIS studies this type of inhibitor with an inhibition efficiency of more than 90.47%, facilitates the formation of a protective layer on the surface, effectively controlling the initiation and propagation of pits. As the immersion time increases, the inhibitor creates conditions where the aluminum anode corrodes uniformly, providing the necessary electrons and capacity for the battery to perform better. The SEM results also demonstrate that the corrosion of aluminum becomes more uniform, resulting in an impressive anode efficiency of 90.19% in the galvanostatic discharge test.
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