Study on electrochemical properties of Al-Ga-Mn-Ca-Cu alloy electrode alkaline system

Abstract

This study is aimed to study a new type of Al-Ga-Mn-Ca-Cu anode alloy. The corrosion behavior and electrochemical performance of the alloy in different concentrations of NaOH solution were studied. The micro-corrosion morphology of the alloy anode was observed. The conclusion is as follows: With the increase of the concentration of NaOH solution, the alloy anode film resistance Rf and the pore resistance Rpor are reduced, so that the reaction rate of the anode of the reaction alloy is increased, the activity is improved, and the reaction of the alloy anode is facilitated; The main corrosion factor of alloy anode is hydrogen evolution corrosion. Therefore, inhibition of hydrogen evolution corrosion on the basis of maintaining anode activity is the next research focus of the alloy anode. When the alloy anode is continuously constant current discharge at different current densities, the voltage of 5mol/L NaOH solution the minimum drop is the most stable; the comprehensive performance is 4mol/L NaOH solution, and the discharge performance is the best, the Al-0.017Ga-0.885Mn-0.038Ca-0.048Cu (wt.%) alloy has a lower corrosion rate in the 4mol/L NaOH solution. The higher discharge voltage and the highest anode energy density are more suitable for continuous constant current discharge at different current densities; the constant current discharge and EIS results of the alloy agree well with the corrosion characteristics.