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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-amino- phenol 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℃.
The performance of Al-alloy anode in 4 mol / L KOH with and without stannate and o-aminophenol at 25 ° C and 55 ° C was studied by hydrogen collection, potentiodynamic polarization and electrochemical impedance spectra, o-amino-phenol 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. Here is synergetic effect of stannate with o- aminophenol on the behavior of Al-alloy, and the inhibitive efficiency at 55 ° C is better than that at 25 ° C.