Abstract
The effect of 1,2-diaminopropane addition on zinc electrodeposition was studied using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Adding 1,2-diaminopropane into the electrodeposition bath increased the zinc ion discharge potential. Analysis of chronoamperograms in the absence and presence of 1,2-diaminopropane indicated that the progressive nucleation is predominant in both cases. Scanning electron microscopy analysis showed that the zinc coating obtained in the presence of 1,2-diaminopropane is more homogenous in appearance and lower in crystallite size. By inhibiting the growth of (00·2) planes, 1,2-diaminopropane also affected the texture of the zinc deposit. Potentiodynamic polarisation readings in deaerated 5%NaCl solution indicated that the corrosion resistance of the zinc deposit is slightly improved in the presence of 1,2-diaminopropane in the bath.
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