A ROTATING-DISC ELECTRODE STUDY OF ZINC ELECTRODEPOSITION FROM ALKALINE ZINCATE SOLUTIONS

The method of the rotating disc electrode was used for the potentiodyn amic investigation of zinc deposition on steel from alkaline zincate e lectrolytes The effect of Two types of additives -basic and brightener s, as well as their combinations on the cathodic characteristics of zi nc electrodeposition was established. The measurements tinder controll ed hydrodynamic conditions show that zinc deposition from electrolytes without additives is always mass transport limited and that deposits are powdery. In the presence of additives the deposition is kineticall y controlled and smooth compact zinc is formed. The inhibition influen ce of the additives on the electrochemical reduction of zinc was also estimated The data were col related with Hull cell experiments.