Synergetic effect of stannate with o-aminophenol on inhibiting H2 evolution of Al anode in strong alkaline media
The performance of Al-alloy anode in 4 mol/L KOH with and without stannate and o-aminophenol at 25 ℃ and 55 ℃ was studied by hydrogen collection, potentiodynamic polarization and electrochemical impedance spectrum. o-aminophenol acts as a perfect inhibitor because of its adsorbability and forming chelate complex at its optimum concentration of 0.4 mol/L. Stannate enhances the inhibition of o-aminophenol and improves the activity of Al-alloy because of its reduction to tin. There is synergetic effect of stannate with o-aminophenol on the behavior of Al-alloy, and the inhibitive efficiency at 55 ℃ is better than that at 25 ℃.
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