Effect of Additives on the Structure and Properties of Electrodeposited Zinc Coatings Zinc coatings were electrodeposited on steel substrate from an acidic sulphate bath. The effect of oxalate anions and 1, 2-diaminopropane as chelating agents on nucleation and growth mechanism, surface morphology, predominant texture and corrosion behaviour of zinc electrodeposits was investigated. Evaluation of nucleation mode of zinc in the presence and absence of oxalate anions showed that the instantaneous nucleation is predominant in both cases (pH =2). From the analysis of the chronoamperometric transients and the AFM images, the nuclei density has been calculated. The values obtained from AFM images are one order of magnitude higher than those obtained by analysis. However, a less number of nuclei are formed on steel substrate in the presence of oxalate anions. Electrochemical impedance spectroscopy revealed that in the bath containing oxalate anions, the growth of deposit is semi-infinite diffusion controlled. While in the absence of oxalate anions, the charge transfer control was governed. In the absence of oxalate anions, the texture components of zinc coating were mostly basal and low angle pyramidal planes, whereas in the presence of oxalate anions, the high angle pyramidal and prism planes were dominant. Furthermore, oxalate anions changed the zinc surface morphology from packets of hexagonal platelets to a granular nature. It was observed that the corrosion resistance of zinc electrodeposits is related to the crystallographic planes exposed to aggressive solution, and not only the planes considered as texture components. The findings highlight the role of surface morphology of the coatings on exchange current density of water reduction and its subsequent effect on the corrosion resistance. In the presence of oxalate anions, the zinc coating produced had a better corrosion protective property than that deposited from bath without oxalate anions. The 1, 2 diamionpropane greatly affected the zinc deposits and its effects can be attributed to its retarding effect of nucleation and growth. The voltammetric analysis has shown that the presence of 1, 2 diaminopropane in the sulphate bath shifts the reduction potential of Zn (II) to more negative values. Analysis of chronoamperograms obtained in the absence and presence of 1, 2-diaminopropane indicates that the progressive nucleation is predominant in both cases (pH =5). Electrochemical impedance spectroscopy revealed that in the bath containing 1, 2-diaminopropane, the surface diffusion of zinc adions should be considered slower than in the absence of1, 2-diaminopropane. This additive produces a uniform